Method and system for improving signal amplification performance of sensor

Abstract

The invention is suitable for the technical field of sensors, and provides a method and system for improving the signal amplification performance of a sensor, a switching device is additionally arranged between a sensing device and an operational amplifier, and the switching device is in communication connection with a signal processor MCU. The signal processor MCU controls the switch-on and switch-off of the switch device by outputting switch-on and switch-off instructions, the signal communication between the switch device and the operational amplifier device is sensed, the power supply end of the switch device is connected with a power supply VCC, and the method comprises the following steps: S1, the equipment is electrified to initialize the signal processor MCU to obtain an accurate bias reference voltage value; s2, conducting a signal communication circuit between the sensor device and the operational amplifier device to detect a human body induction signal; and S3, comparing the read output signal of the operational amplifier with the accurate bias reference voltage obtained during initialization by the signal processor MCU, calculating a difference value or an accumulated difference value within a preset time, and if the difference value or the accumulated difference value exceeds a set threshold value, considering that the human body action is detected, and executing corresponding business operation according to a preset mode. The scheme is simple and clear, errors of multiple sources can be effectively avoided, and the signal processing accuracy is effectively improved.

Description

Technical Field

[0001] The present invention belongs to the field of sensor technology, and in particular to an analog signal human body sensing sensor and its signal amplification processing technology, and its application in the fields of lighting control and intelligent building control, and in particular to a method and system for improving the sensor signal amplification performance. Background Art

[0002] Human body sensors are widely used in the fields of lighting control and intelligent building control. For example, by detecting the human body, the function of turning on the light when someone comes and turning off the light when someone leaves can be realized. Or by detecting the human body, the air conditioning and heating system can be turned on when someone is present and turned off when someone leaves. This can realize automatic and intelligent control and provide users with a more comfortable and energy-saving environment.

[0003] Commonly used human body sensing sensor devices include passive infrared sensors (PIR), microwave sensors, ultrasonic sensors, etc. These devices will output weak electrical signals when detecting human body movements. Usually, human body sensing control devices will include analog signal amplification circuits to amplify and detect these electrical signals to facilitate subsequent judgment on whether human body movements are actually sensed.

[0004] Common circuits for amplifying human body sensing signals include the following two designs: Design scheme for direct amplification of analog signals Figure 1A design scheme for direct amplification of analog signals is shown in the figure, where 1-sensor device, 2-op amp device, 3-voltage divider circuit, and 4-signal detection part. The signal output pin of the sensor device is connected to the op amp device. When human body movement is detected, a weak electrical signal will be output. The op amp device can amplify the weak electrical signal and superimpose it on the bias reference voltage for output. The voltage divider circuit provides the bias reference voltage for the op amp. It is usually implemented using two or more resistors. The signal detection part is used to detect and confirm whether the amplified signal represents human body movement. The detection method is usually to compare the signal output by the op amp with the designed reference bias voltage, and calculate the difference or the cumulative difference over a period of time. If the difference or the cumulative difference exceeds a threshold, it is considered that human body movement is detected. The design of this part is usually implemented by a microprocessor and its peripheral circuits, or it may be implemented by a set of hardware circuits. This scheme is a relatively common reference design scheme. However, this scheme has the following problems, which may affect the analog signal processing performance: power supply voltage error. VCC is the power supply voltage, and the bias reference voltage is obtained by dividing this power supply voltage. If there is an error in the power supply voltage, the signal output by the op amp will also have an error with the design, resulting in a decrease in the subsequent signal processing performance. Error in the voltage divider circuit. The voltage divider circuit usually uses multiple resistors for voltage division design. The accuracy of the resistors themselves will affect the accuracy of the voltage division, resulting in an error between the signal output by the op amp and the design, resulting in a decrease in the subsequent signal processing performance. Error in the op amp device itself. The internal circuit of the op amp itself will have certain individual differences, resulting in an error between the output amplified signal and the design, resulting in a decrease in the subsequent signal processing performance.

[0005] Analog signal amplification and reference voltage detection design Figure 2 The analog signal amplification and reference voltage detection design is shown. Figure 2 China Figure 1 A connecting wire, 5-connecting wire, is added. The connecting wire connects the bias reference voltage to the circuit of the op amp and the signal detection part at the same time. The signal detection part is revised and optimized, and the signal output by the op amp is compared with the actual reference bias voltage to calculate the difference or the cumulative difference over a period of time. If the difference or the cumulative difference exceeds a threshold, it is considered that human movement is detected. Compared with the previous scheme, the analog signal amplification and reference voltage detection design scheme can effectively avoid the error of the power supply voltage and the error of the voltage divider circuit. Provide signal processing performance. This scheme still cannot avoid the error of the op amp device itself. Summary of the invention

[0006] As mentioned above, these two common human body sensing device analog signal amplification design solutions cannot effectively avoid errors, resulting in the performance of human body sensing signal detection being affected. This will limit the use of the product, fail to meet more application scenarios, and may cause problems such as false detection. Therefore, a better and higher performance design solution is urgently needed.

[0007] The requirements and goals of the new design solution include: the design solution should be simple and easy to implement, can be implemented using common components, and the cost should not increase significantly. It should be able to effectively avoid power supply voltage errors, voltage divider circuit errors, and operational amplifier device errors.

[0008] The purpose of the present invention is to provide a method and system for improving the sensor signal amplification performance, aiming to solve the above-mentioned technical problems.

[0009] The present invention is implemented as follows: a method for improving the sensor signal amplification performance, wherein a switch device is added between the sensor device and the operational amplifier device, the switch device is communicatively connected to the signal processor MCU, the signal processor MCU controls the switch device to turn on and off the signal communication between the sensor device and the operational amplifier device by outputting on and off instructions, and the power supply end of the switch device is connected to the power supply VCC. The method for improving the sensor signal amplification performance comprises the following steps: S1, the device is powered on to initialize the signal processor MCU to obtain an accurate bias reference voltage value; S2, conduct the signal between the sensor device and the operational amplifier device, detect the human body sensing signal and provide it to the next step; S3. The signal processor MCU compares the read output signal of the operational amplifier device with the accurate bias reference voltage obtained during initialization, and calculates the difference or the accumulated difference within a preset time. If the difference or the accumulated difference exceeds the set threshold, it is considered that human motion is detected, and the corresponding business operation is performed in a preset manner. If not, the difference or the accumulated difference does not exceed the set threshold, and the process returns to step S2.

[0010] A further technical solution of the present invention is: the step S1 further includes the following steps: S11, the signal processor MCU outputs a control disconnection instruction to the control end of the switch device, and the switch device executes the control instruction to cut off the communication between the operational amplifier device and the sensor device; S12, the signal processor MCU continuously reads the voltage output by the operational amplifier device, and determines whether the voltage fluctuation value meets the error range requirement. If so, the read data meets the requirement, and the accurate bias reference voltage value is recorded for subsequent signal processing, and step S2 is continued. If not, step S12 is continued to be detected in a loop until the requirement is met.

[0011] A further technical solution of the present invention is: in step S12, the operational amplifier device is powered on and enters a stable working state, and the signal processor MCU continuously reads the output readings of the operational amplifier device at intervals of several milliseconds, and calculates the fluctuation range of the readings, and the fluctuation range of the readings should be less than a certain range.

[0012] A further technical solution of the present invention is: the step S2 includes the following steps: S21, the signal processor MCU outputs a control instruction to the control end of the switch device, the switch device executes the control instruction to conduct the communication between the operational amplifier device and the sensor device, and the operational amplifier device amplifies the signal transmitted by the sensor device; S22, the signal processor MCU continuously reads the voltage reading output by the operational amplifier device.

[0013] A further technical solution of the present invention is: the step S3 includes the following steps: S31, calculating the difference or cumulative difference between the read voltage reading and the accurate bias reference voltage value; S32, judging whether the difference or the cumulative difference meets the requirement of human motion sensing, if so, it is considered that human motion sensing is detected and the corresponding operation is performed, if not, returning to step S31.

[0014] A further technical solution of the present invention is: in the step S32, it is determined whether the difference or the cumulative difference satisfies the difference comparison method or the integral comparison method adopted by the human motion sensing.

[0015] A further technical solution of the present invention is: the signal processor MCU adopts a TLSR8250 Bluetooth chip, the TLSR8250 Bluetooth chip integrates Bluetooth wireless transceiver function, has an MCU with a main frequency of 32M, and has built-in running memory and storage flash memory.

[0016] Another object of the present invention is to provide a system for improving the sensor signal amplification performance, wherein a switch device is added between the sensor device and the operational amplifier device, the switch device is communicatively connected to the signal processor MCU, the signal processor MCU controls the switch device to turn on and off the signal communication between the sensor device and the operational amplifier device by outputting on and off instructions, and the power supply end of the switch device is connected to the power supply VCC. The system for improving the sensor signal amplification performance includes The reference voltage acquisition module is used to obtain an accurate bias reference voltage value when the device is powered on and the initialization signal processor MCU is used; The human body sensing module is used to conduct the signal between the sensor device and the operational amplifier device, detect the human body sensing signal and provide it to the signal processing module; The signal processing module is used for the signal processor MCU to compare the output signal of the op amp device read with the accurate bias reference voltage obtained during initialization, calculate the difference or the accumulated difference within a preset time. If the difference or the accumulated difference exceeds the set threshold, it is considered that human motion is detected and the corresponding business operation is performed in a preset manner. Otherwise, if the difference or the accumulated difference does not exceed the set threshold, it is returned to the human body sensing module.

[0017] A further technical solution of the present invention is: the reference voltage acquisition module also includes A switch device closing unit, used for the signal processor MCU to output a control disconnection instruction to the switch device control terminal, and the switch device executes the control instruction to cut off the communication between the operational amplifier device and the sensor device; The voltage value acquisition unit is used for the signal processor MCU to continuously read the voltage output by the operational amplifier device, and to determine whether the voltage fluctuation value meets the error range requirements. If the read data meets the requirements, the accurate bias reference voltage value is recorded for subsequent signal processing, and the human body sensing module continues to be executed. If not, the voltage value acquisition unit continues to detect in a loop until the requirements are met; The operational amplifier device in the voltage value acquisition unit is powered on and enters a stable working state. The signal processor MCU continuously reads the output readings of the operational amplifier device at intervals of several milliseconds and calculates the fluctuation range of the readings. The fluctuation range of the readings should be less than a certain range.

[0018] A further technical solution of the present invention is: the human body sensing module includes A human motion sensing unit is used to sense human motion near the sensor device and output the sensed signal to the subsequent unit; A switch unit, used for the signal processor MCU to control the on and off of the communication between the sensor device and the operational amplifier device; The signal amplification unit is used for receiving the human motion sensing signal output by the sensor device after the signal processor MCU controls the communication between the operational amplifier device and the sensor device, and amplifying the received human motion sensing signal; The signal processing module includes A voltage reading unit is used for the signal processor MCU to continuously read the voltage reading of the amplified human motion sensing signal output by the operational amplifier device; A difference calculation unit, used to calculate the difference or cumulative difference between the voltage reading of the human motion sensing signal and the accurate bias reference voltage value; A judgment and comparison execution unit is used to judge whether the difference or cumulative difference meets the human motion sensing requirement. If so, it is considered that human motion sensing is detected and the corresponding operation is performed. If not, it is returned to the difference acquisition unit; The judgment and comparison execution unit judges whether the difference or the cumulative difference satisfies the difference comparison method or the integral comparison method adopted by the human motion sensing; The signal processor MCU adopts the TLSR8250 Bluetooth chip, which integrates Bluetooth wireless transceiver function, has an MCU with a main frequency of 32M, and has built-in running memory and storage flash memory.

[0019] The beneficial effects of the present invention are: the scheme is simple and clear, can effectively avoid errors from multiple sources, and effectively improve the accuracy of signal processing. As the edge device of the Internet of Things, sensor devices have become intelligent. The sensor device already has a microprocessor inside, and the present application scheme can make full use of the processing power of the microprocessor without significantly increasing the cost. The present application can effectively avoid the impact of errors in power supply, resistance, and operational amplifier. Therefore, in actual design and production, the accuracy requirements for these components and parts can be reduced, which can not only reduce costs, but also reduce the requirements and related costs for device consistency screening. In practical applications, it helps to reduce the overall cost. The improvement of the processing accuracy of human body sensing analog signals can enable sensor devices to sense human body movements more accurately, sense smaller human body movements at a longer distance, and effectively reduce the error rate and missed detection rate of sensing. Thereby broadening the application scope and scenarios of sensor devices. It is helpful to promote the application of smart lighting and smart building control. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a block diagram of a design solution for direct amplification of analog signals provided by an embodiment of the present invention.

[0021] Method and system for improving sensor signal amplification performance; Figure 2 It is a block diagram of the analog signal amplification and reference voltage detection design scheme provided by an embodiment of the present invention.

[0022] Figure 3 It is a block diagram of an improved sensor signal amplification processing design solution provided by an embodiment of the present invention.

[0023] Figure 4 The flowchart of the method for improving the sensor signal amplification performance provided by the embodiment of the present invention.

[0024] Figure 5 This is a flow chart for obtaining an accurate bias reference voltage provided by an embodiment of the present invention.

[0025] Figure 6 This is a flow chart of human body sensing detection provided by an embodiment of the present invention.

[0026] Figure 7The diagrams are front and back appearance diagrams of a housing and a circuit board of a Bluetooth smart lighting sensor provided by an embodiment of the present invention.

[0027] Figure 8 It is a schematic diagram of a smart lamp equipped with a smart lighting sensor provided by an embodiment of the present invention.

[0028] Fig. 9 is a test result diagram of sensor A provided in an embodiment of the present invention.

[0029] Fig.10 is a test result diagram of sensor B provided in an embodiment of the present invention.

[0030] Fig.11 is a test result diagram of sensor C provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0031] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0032] In the description of the present invention, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, in the description of the present invention, "multiple" means two or more, unless otherwise clearly and specifically defined.

[0033] like Figure 1 As shown, the flowchart of the method for improving the sensor signal amplification performance provided by the present invention is described in detail as follows: The signal detection and judgment functions are realized through the signal processor MCU.

[0034] Step S1, the device is powered on and initialized, and the signal processor MCU obtains an accurate bias reference voltage value; after the device is powered on or initialized, the signal processor MCU first needs to obtain an accurate bias reference voltage. When the device is initialized (or reset), the signal output from the sensor to the op amp is cut off, so that the input pin of the op amp is in a low level state. When the signal processor MCU is initialized, it detects the output voltage of the op amp, which is the actual accurate bias reference voltage value after including the power supply voltage error, the voltage divider circuit error, and the op amp device error. The signal processor MCU records this value and uses it for subsequent signal detection and judgment.

[0035] Step S2, conduct the signal between the sensor device and the operational amplifier device, detect the human body sensing signal and provide it for use in subsequent steps; after the signal processor MCU obtains the accurate bias reference voltage, the signal processor MCU outputs a control instruction to the control end of the switch device, executes the instruction to conduct the communication output and input circuit between the sensor and the operational amplifier, starts to detect the human body sensing signal, uses the sensor characteristics to sense the detection signal, transmits the signal to the operational amplifier for signal amplification, and at the same time, the signal processor MCU continuously reads the voltage reading in the signal amplified by the operational amplifier, and outputs the reading to the next process for continued use.

[0036] Step S3, the signal processor MCU compares the read output signal of the op amp device with the accurate bias reference voltage obtained during initialization, calculates the difference or the accumulated difference within a preset time, if the difference or the accumulated difference exceeds the set threshold, it is considered that human motion is detected, and the corresponding business operation is performed in a preset manner, if not, the difference or the accumulated difference does not exceed the set threshold, then returns to step S2. Then start to continuously detect the human body sensing signal, and perform the corresponding business operation in a preset manner when the human body motion is successfully detected. During the detection, the signal processor MCU compares the read output signal of the op amp with the accurate reference bias voltage obtained during initialization, and calculates the difference or the accumulated difference within a period of time. If the difference or the accumulated difference exceeds a threshold, it is considered that human motion is detected.

[0037] According to the requirements and objectives of the scheme, the present invention design requires: The signal detection and judgment functions are realized through the signal processor MCU.

[0038] When the device is initialized (or reset), the signal output from the sensor to the op amp is cut off, so that the input pin of the op amp is in a low level state.

[0039] When the signal processor MCU is initialized, it detects the output voltage of the op amp, which is the actual accurate bias reference voltage value after including the power supply voltage error, voltage divider circuit error, and op amp device error. The signal processor MCU records this value and uses it for subsequent signal detection and judgment.

[0040] After the signal processor MCU completes initialization and reads the accurate bias reference voltage, it turns on the signal output and input circuit between the sensor and the op amp and starts detecting the human body sensing signal. During detection, the signal processor MCU compares the read op amp output signal with the accurate reference bias voltage obtained during initialization, and calculates the difference or the accumulated difference over a period of time. If the difference or the accumulated difference exceeds a threshold, it is considered that human motion is detected.

[0041] like Figure 3 As shown, it is the improved analog signal amplification processing design scheme of this application. It includes the following components: Component 1 is a sensor device. The signal output pin of the device is connected to the subsequent processing circuit. When the sensor component detects human body movement, it will output a weak electrical signal.

[0042] Component 2 is an operational amplifier device, which can amplify weak electrical signals and add them to the bias reference voltage for output.

[0043] Component 3 is a voltage divider circuit, which provides a bias reference voltage for the op amp. It is usually implemented using two or more resistors.

[0044] Component 4 is the signal detection part. It is used to detect and confirm whether the amplified signal represents human body movement. This part of the circuit is a signal processor MCU and its peripheral circuits. The specific detection method will be described in detail in the subsequent processing flow.

[0045] Component 5 is a switch device. The signal processor MCU can control this device to turn on and off. When it is turned on, the sensor signal can be directly connected to the output of the op amp. When it is turned off, the output signal of the sensor is cut off, and the signal input pin of the op amp will always be in a low-level input state. In some design applications, the switch device can or should be placed before the sensor device.

[0046] Component 6 is a control circuit of the signal processor MCU controlling component 5. Usually, a general purpose input and output pin GPIO of the signal processor MCU is connected to the control pin of the switch device. The signal processor MCU controls the on and off of the switch device by setting high and low levels on this GPIO pin.

[0047] Overall processing flow like Figure 4 The figure shows the overall processing flow chart.

[0048] After the device is powered on or initialized, the signal processor MCU first needs to obtain an accurate bias reference voltage.

[0049] Then it starts to continuously detect human body sensing signals, and executes corresponding business operations in a preset manner when human body movements are successfully detected.

[0050] Obtaining accurate bias reference voltage process like Figure 5 The following is a flowchart for obtaining accurate bias reference voltage. The signal processor MCU controls the switch device to be turned off through the GPIO pin, thereby cutting off the sensor signal input of the operational amplifier.

[0051] The signal processor MCU continuously reads the voltage of the output pin of the op amp.

[0052] Determine whether the voltage fluctuation value meets the error range requirements. The error range can be determined based on the following factors: Typical power-on initialization time of an op amp. Usually, when powered on, the op amp needs milliseconds to seconds to initialize and enter a stable working state. Therefore, the signal processor MCU needs to wait for several seconds to avoid unstable readings during the op amp initialization.

[0053] The op amp output readings should be read continuously at intervals of several milliseconds, and the fluctuation range of the readings should be calculated. After the op amp works stably, the fluctuation range of the readings should be less than a certain range.

[0054] If the read data meets the requirements, the accurate bias reference voltage value is recorded for subsequent signal processing and the process is exited.

[0055] Human body sensing detection process like Figure 6 The figure shows a flow chart of human body sensing detection.

[0056] The signal processor MCU controls the switch device to be turned off through the GPIO pin, thereby cutting off the sensor signal input of the operational amplifier.

[0057] The signal processor MCU continuously reads the voltage of the output pin of the op amp.

[0058] Determine whether the voltage fluctuation value meets the error range requirements. The error range can be determined based on the following factors: Typical power-on initialization time of an op amp. Usually, when powered on, the op amp needs milliseconds to seconds to initialize and enter a stable working state. Therefore, the signal processor MCU needs to wait for several seconds to avoid unstable readings during the op amp initialization.

[0059] The op amp output readings should be read continuously at intervals of several milliseconds, and the fluctuation range of the readings should be calculated. After the op amp works stably, the fluctuation range of the readings should be less than a certain range.

[0060] If the read data meets the requirements, the accurate bias reference voltage value is recorded for subsequent signal processing and the process is exited.

[0061] From the above scheme description, it can be seen that the improved human body sensing sensor analog signal amplification processing design scheme proposed in the present invention has several obvious advantages: The solution is simple and clear, and can effectively avoid errors from multiple sources and effectively improve signal processing accuracy.

[0062] As the edge device of the Internet of Things, sensor devices have become intelligent. Sensor devices already have microprocessors inside, and the solution of the present invention can fully utilize the processing power of the microprocessor without significantly increasing the cost. The solution can effectively avoid the impact of errors in power supplies, resistors, and op amps. Therefore, in actual design and production, the accuracy requirements for these components and parts can be reduced, which can reduce costs as well as the requirements for device consistency screening and related expenses. In practical applications, it helps to reduce overall costs.

[0063] The improvement of the processing accuracy of human body sensing analog signals can enable sensor devices to sense human movements more accurately, sense smaller human movements at a longer distance, and effectively reduce the error rate and missed detection rate of sensing. This will broaden the application scope and scenarios of sensor devices and help promote the application of smart lighting and smart building control.

[0064] According to the technical solution of the patent of this invention, the Tailing TLSR8250 Bluetooth chip is selected as the microprocessor chip in the implementation. This chip integrates Bluetooth wireless transceiver function, has a 32M main frequency MCU, and has built-in running memory and storage flash memory. The chip supports BLE MESH wireless communication technology and can support up to 255 devices online at the same time in a network. It is one of the preferred solutions for wireless smart devices and has been widely used in the market.

[0065] Passive infrared devices (PIR) are used as human body sensing sensor devices. PIR devices are matched with appropriate Fresnel lenses to sense the slight changes in infrared rays emitted by human body temperature when human body moves. It is used to detect whether there is human movement within the field of view.

[0066] The designed sensor device is powered by DC 12V and provides a 0-10V dimming output terminal for controlling the switch and brightness of lighting fixtures.

[0067] During the scheme evaluation process, if the sensor detects human motion, the lamp will be turned on and dimmed to the highest brightness for 2 seconds. If no human motion is sensed, the lamp will be turned off.

[0068] Bluetooth Smart Lighting Sensor In this implementation plan, the Bluetooth smart lighting sensor uses the Tailing TLSR8250 Bluetooth chip as the main chip, is powered by DC12V, contains a PIR human body sensing sensor, and controls the lamps through a 0-10V dimming output.

[0069] The appearance and PCBA of the controller are as follows: Figure 7 As shown: like Figure 7 As shown, the Bluetooth smart lighting sensor includes the following components: Component 1 is the TLSR8250 Bluetooth chip, which contains Bluetooth transceiver and communication software, and sensor control software.

[0070] Component 2 is a PIR passive infrared human motion sensor.

[0071] Component 3 is an operational amplifier device.

[0072] Component 4 is a switch control device.

[0073] Component 5 is an interface, including a DC 12V power input and a 0-10V dimming output terminal.

[0074] Component 6 is a Fresnel lens of a PIR passive infrared human motion sensing device.

[0075] Other devices and other functions on the circuit board are not related to the present invention and do not affect the functions and effects of the present invention, and are not described in this article.

[0076] Smart lamps with Bluetooth smart lighting sensors In this implementation plan, smart lamps are used and Bluetooth smart lighting sensors are installed. The smart lamps are equipped with a DC12V power output interface and a 0-10V dimming input interface, and a location for the Bluetooth smart lighting sensor is reserved. They can work with the Bluetooth smart lighting sensor and be turned on, off or dimmed through the Bluetooth smart lighting sensor. Figure 8 As shown, the specific design and function of the smart lamp are irrelevant to the patent of the present invention and do not affect the function and effect of the patent of the present invention, and are not described in this article.

[0077] Test result evaluation Test Method In the implementation plan, the human motion sensing test method commonly used in the industry is used to test the human motion sensing performance in different design schemes. The test method is briefly described as follows: Install lamps at different heights, usually including 3 meters, 6 meters, 12 meters, etc.

[0078] On the ground, draw a square grid with varying lengths of 0.5 meters, centered just below the human motion sensor.

[0079] Keep the test site free of interference, and have a tester walk from left to right and then from right to left, from a distance to the sensor installation location at a normal walking speed. Record the locations where the sensor senses human movements and mark these sensing points on the coordinate graph.

[0080] Each time a human movement is sensed, the light will turn on. At this time, the tester needs to stop and wait for the light to turn off before continuing the walking test.

[0081] Comparison criteria for test performance According to the above test method, the human body sensing sensor (sensor A) using direct analog signal amplification, the human body sensing sensor (sensor B) using analog signal amplification and reference voltage detection design, and the Bluetooth smart lighting sensor (sensor C) using the patent of this invention are tested respectively.

[0082] Under the same installation height and test conditions, the more sensing points that sense human movements and the wider the range covered by the sensing points, the better the sensing performance of the sensor.

[0083] Test Results like Figure 9-11 The following are test results of three sensors.

[0084] Test result evaluation From the above test result chart, it can be seen that the human motion sensing performance of sensor B is slightly better than that of sensor A. The human motion sensing performance of sensor C is much better than that of sensor B and sensor A.

[0085] The test results show that the solution of the invention patent is feasible and fully meets the design requirements and goals. It has excellent market and technical feasibility.

[0086] Another object of the present invention is to provide a system for improving the sensor signal amplification performance, wherein a switch device is added between the sensor device and the operational amplifier device, the switch device is communicatively connected to the signal processor MCU, the signal processor MCU controls the switch device to turn on and off the signal communication between the sensor device and the operational amplifier device by outputting on and off instructions, and the power supply end of the switch device is connected to the power supply VCC. The system for improving the sensor signal amplification performance includes The reference voltage acquisition module is used to obtain an accurate bias reference voltage value when the device is powered on and the initialization signal processor MCU is used; The human body sensing module is used to conduct the signal between the sensor device and the operational amplifier device, detect the human body sensing signal and provide it to the signal processing module; The signal processing module is used for the signal processor MCU to compare the output signal of the op amp device read with the accurate bias reference voltage obtained during initialization, calculate the difference or the accumulated difference within a preset time. If the difference or the accumulated difference exceeds the set threshold, it is considered that human motion is detected and the corresponding business operation is performed in a preset manner. Otherwise, if the difference or the accumulated difference does not exceed the set threshold, it is returned to the human body sensing module.

[0087] The reference voltage acquisition module also includes A switch device closing unit, used for the signal processor MCU to output a control disconnection instruction to the switch device control terminal, and the switch device executes the control instruction to cut off the communication between the operational amplifier device and the sensor device; The voltage value acquisition unit is used for the signal processor MCU to continuously read the voltage output by the operational amplifier device, and to determine whether the voltage fluctuation value meets the error range requirements. If the read data meets the requirements, the accurate bias reference voltage value is recorded for subsequent signal processing, and the human body sensing module continues to be executed. If not, the voltage value acquisition unit continues to detect in a loop until the requirements are met; The operational amplifier device in the voltage value acquisition unit is powered on and enters a stable working state. The signal processor MCU continuously reads the output readings of the operational amplifier device at intervals of several milliseconds and calculates the fluctuation range of the readings. The fluctuation range of the readings should be less than a certain range.

[0088] The human body sensing module includes A human motion sensing unit is used to sense human motion near the sensor device and output the sensed signal to the subsequent unit; A switch unit, used for the signal processor MCU to control the on and off of the communication between the sensor device and the operational amplifier device; The signal amplification unit is used for receiving the human motion sensing signal output by the sensor device after the signal processor MCU controls the communication between the operational amplifier device and the sensor device, and amplifying the received human motion sensing signal; The signal processing module includes A voltage reading unit is used for the signal processor MCU to continuously read the voltage reading of the amplified human motion sensing signal output by the operational amplifier device; A difference calculation unit, used to calculate the difference or cumulative difference between the voltage reading of the human motion sensing signal and the accurate bias reference voltage value; A judgment and comparison execution unit is used to judge whether the difference or cumulative difference meets the human motion sensing requirement. If so, it is considered that human motion sensing is detected and the corresponding operation is performed. If not, it is returned to the difference acquisition unit; The judgment and comparison execution unit judges whether the difference or the cumulative difference satisfies the difference comparison method or the integral comparison method adopted by the human motion sensing; The signal processor MCU adopts the TLSR8250 Bluetooth chip, which integrates Bluetooth wireless transceiver function, has an MCU with a main frequency of 32M, and has built-in running memory and storage flash memory.

[0089] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for improving the sensor signal amplification performance, characterized in that: A switch device is added between the sensor device and the operational amplifier device, the switch device is communicatively connected to the signal processor MCU, the signal processor MCU controls the switch device to turn on and off the signal communication between the sensor device and the operational amplifier device by outputting on and off instructions, and the power supply end of the switch device is connected to the power supply VCC. The method for improving the sensor signal amplification performance includes the following steps: S1, the device is powered on to initialize the signal processor MCU to obtain an accurate bias reference voltage value; S2, turning on the communication circuit between the sensor device and the operational amplifier device, detecting the human body sensing signal and providing it to the next step; S3. The signal processor MCU compares the read output signal of the operational amplifier device with the accurate bias reference voltage obtained during initialization, and calculates the difference or the accumulated difference within a preset time. If the difference or the accumulated difference exceeds the set threshold, it is considered that human motion is detected, and the corresponding business operation is performed in a preset manner. If not, the difference or the accumulated difference does not exceed the set threshold, and the process returns to step S2.

2. The method for improving sensor signal amplification performance according to claim 1, characterized in that: The step S1 further comprises the following steps: S11, the signal processor MCU outputs a control disconnection instruction to the control end of the switch device, and the switch device executes the control instruction to cut off the communication between the operational amplifier device and the sensor device; S12, the signal processor MCU continuously reads the voltage output by the operational amplifier device, and determines whether the voltage fluctuation value meets the error range requirement. If so, the read data meets the requirement, and the accurate bias reference voltage value is recorded for subsequent signal processing, and step S2 is continued. If not, step S12 is continued to be detected in a loop until the requirement is met.

3. The method for improving sensor signal amplification performance according to claim 2, characterized in that: In step S12, the operational amplifier device is powered on and enters a stable working state. The signal processor MCU continuously reads the output readings of the operational amplifier device at intervals of several milliseconds, and calculates the fluctuation range of the readings. The fluctuation range of the readings should be less than a certain range.

4. The method for improving sensor signal amplification performance according to claim 3, characterized in that: The step S2 includes the following steps: S21, the signal processor MCU outputs a control instruction to the control end of the switch device, the switch device executes the control instruction to conduct the communication between the operational amplifier device and the sensor device, and the operational amplifier device amplifies the signal transmitted by the sensor device; S22, the signal processor MCU continuously reads the voltage reading output by the operational amplifier device.

5. The method for improving sensor signal amplification performance according to claim 4, characterized in that: The step S3 includes the following steps: S31, calculating the difference or cumulative difference between the read voltage reading and the accurate bias reference voltage value; S32, judging whether the difference or the cumulative difference meets the requirement of human motion sensing, if so, it is considered that human motion sensing is detected and the corresponding operation is performed, if not, returning to step S31.

6. The method for improving sensor signal amplification performance according to claim 5, characterized in that: In step S32, it is determined whether the difference or the accumulated difference satisfies the difference comparison method or the integral comparison method adopted by the human motion sensing.

7. The method for improving sensor signal amplification performance according to claim 6, characterized in that: The signal processor MCU adopts the TLSR8250 Bluetooth chip, which integrates Bluetooth wireless transceiver function, has an MCU with a main frequency of 32M, and has built-in running memory and storage flash memory.

8. A system for improving sensor signal amplification performance, characterized in that: A switch device is added between the sensor device and the operational amplifier device, the switch device is communicatively connected to the signal processor MCU, the signal processor MCU controls the switch device to turn on and off the signal communication between the sensor device and the operational amplifier device by outputting on and off instructions, and the power supply end of the switch device is connected to the power supply VCC. The system for improving the sensor signal amplification performance includes The reference voltage acquisition module is used to obtain an accurate bias reference voltage value when the device is powered on and the initialization signal processor MCU is used; The human body sensing module is used to conduct the signal between the sensor device and the operational amplifier device, detect the human body sensing signal and provide it to the signal processing module; The signal processing module is used for the signal processor MCU to compare the output signal of the op amp device read with the accurate bias reference voltage obtained during initialization, calculate the difference or the accumulated difference within a preset time. If the difference or the accumulated difference exceeds the set threshold, it is considered that human motion is detected and the corresponding business operation is performed in the preset manner.

9. The system for improving sensor signal amplification performance according to claim 8, characterized in that: The reference voltage acquisition module also includes A switch device closing unit, used for the signal processor MCU to output a control disconnection instruction to the switch device control terminal, and the switch device executes the control instruction to cut off the communication between the operational amplifier device and the sensor device; The voltage value acquisition unit is used for the signal processor MCU to continuously read the voltage output by the operational amplifier device, and to determine whether the voltage fluctuation value meets the error range requirements. If the read data meets the requirements, the accurate bias reference voltage value is recorded for subsequent signal processing, and the human body sensing module continues to be executed. If not, the voltage value acquisition unit continues to detect in a loop until the requirements are met; The operational amplifier device in the voltage value acquisition unit is powered on and enters a stable working state. The signal processor MCU continuously reads the output readings of the operational amplifier device at intervals of several milliseconds and calculates the fluctuation range of the readings. The fluctuation range of the readings should be less than a certain range.

10. The system for improving sensor signal amplification performance according to claim 9, characterized in that: The human body sensing module includes A human motion sensing unit is used to sense human motion near the sensor device and output the sensed signal to the subsequent unit; A switch unit, used for the signal processor MCU to control the on and off of the communication between the sensor device and the operational amplifier device; The signal amplification unit is used for receiving the human motion sensing signal output by the sensor device after the signal processor MCU controls the communication between the operational amplifier device and the sensor device, and amplifying the received human motion sensing signal; The signal processing module includes A voltage reading unit is used for the signal processor MCU to continuously read the voltage reading of the amplified human motion sensing signal output by the operational amplifier device; A difference calculation unit, used to calculate the difference or cumulative difference between the voltage reading of the human motion sensing signal and the accurate bias reference voltage value; A judgment and comparison execution unit is used to judge whether the difference or cumulative difference meets the human motion sensing requirement. If so, it is considered that human motion sensing is detected and the corresponding operation is performed. If not, it is returned to the difference acquisition unit; The judgment and comparison execution unit judges whether the difference or the cumulative difference satisfies the difference comparison method or the integral comparison method adopted by the human motion sensing; The signal processor MCU adopts the TLSR8250 Bluetooth chip, which integrates Bluetooth wireless transceiver function, has an MCU with a main frequency of 32M, and has built-in running memory and storage flash memory.

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