An audible and visual prompting circuit for an inertial navigation measurement device

Abstract

This utility model relates to the field of inertial navigation measurement equipment technology, specifically to an audio-visual prompting circuit for inertial navigation measurement equipment. The indicator light module includes multiple light-emitting diodes (LEDs) of different colors. The anodes of the LEDs are connected to a power supply through current-limiting resistors, and the cathodes are grounded through independent switching transistors. A voice prompt module is used to play preset voice prompt information. An MCU control unit, connected to the indicator light module and the voice prompt module, receives signals from the IMU array and Bluetooth module, and controls the operation of the indicator light module and the voice prompt module according to preset logic. This technical solution can quickly determine the device status.

Description

Technical Field

[0001] This utility model relates to the field of inertial navigation measurement equipment technology, and specifically to an audible and visual prompting circuit for inertial navigation measurement equipment. Background Technology

[0002] As the performance requirements for inertial navigation measurement equipment continue to increase across various fields, real-time and accurate assessment of equipment status has become crucial. Timely understanding of the equipment's operational status, such as whether it has started normally, whether a fault has occurred, and whether the data is accurate and reliable, not only helps ensure stable operation and improve measurement accuracy, but also allows for rapid action in the event of equipment anomalies, preventing serious consequences caused by equipment failure.

[0003] Currently, common status indication methods for inertial navigation measurement equipment mainly include simple indicator lights and viewing status information through host computer software. Simple indicator lights typically use only a single color or a few colors to display the equipment status; for example, a green indicator light indicates normal operation, and a red indicator light indicates a malfunction. While this method is simple and intuitive, it has significant limitations. On the one hand, the status information it can express is very limited, only distinguishing between a few states such as whether the equipment is normal or malfunctioning, and cannot describe in detail the specific type and location of the malfunction. For example, when the inertial navigation measurement equipment experiences sensor failure, power failure, or communication failure, simple indicator lights cannot clearly tell the user which type of malfunction it is, causing great difficulty in equipment maintenance and debugging. On the other hand, in complex working environments, single-color indicator lights may not be conspicuous enough and are easily overlooked, especially in situations with strong light or significant background interference, where operators may not be able to promptly detect abnormal changes in the equipment status.

[0004] While viewing the status information of inertial navigation measurement equipment via host computer software can provide relatively detailed status data, it requires operators to possess certain professional knowledge and skills, as well as the necessary computer equipment and software. In practical applications, this method presents several inconveniences. First, operators need to have a computer at the equipment site and install and run the host computer software, which not only increases the cost and complexity of the equipment but also limits its usage scenarios. For example, carrying a computer may be difficult in some field operations or when moving equipment. Second, viewing status information via host computer software requires operators to have certain software operation and data analysis capabilities; for some non-professionals, it may be difficult to accurately understand and judge the equipment status. Furthermore, in the event of an emergency malfunction, viewing status information via host computer software has a slow response time and cannot promptly issue alarms to operators, potentially leading to further escalation of the fault. Utility Model Content

[0005] The purpose of this invention is to provide an audible and visual prompting circuit for inertial navigation measurement equipment, which can quickly determine the status of the equipment.

[0006] To achieve the above objectives, this disclosure provides an audible and visual prompting circuit for an inertial navigation measurement device, comprising: The indicator module includes multiple light-emitting diodes of different colors. The anodes of the light-emitting diodes are connected to the power supply through a current-limiting resistor, and the cathodes are grounded through independent switching transistors. The voice prompt module is used to play preset voice prompt messages; The MCU control unit, connected to the indicator light module and the voice prompt module, is used to receive signals from the IMU array and the Bluetooth module, and control the operation of the indicator light module and the voice prompt module according to preset logic.

[0007] The beneficial effects of the basic solution: The indicator light module uses multiple LEDs of different colors, which can correspond to different operating states of the device (such as normal operation, fault alarm, data transmission, low battery, etc.) through color, on / off combination, or flashing frequency. Meanwhile, the voice prompt module provides auditory information through preset voice prompts, complementing the visual cues. This is especially suitable for scenarios where the device is inconvenient to look at directly, ensuring that users can quickly obtain key information.

[0008] The cathodes of the LEDs are grounded through independent switching transistors, allowing each indicator to be individually controlled by the MCU and supporting custom status codes (such as solid red for fatal faults and alternating flashing green and red for calibration), meeting the prompting needs of different scenarios. Furthermore, the independent switching transistor design reduces the risk of interference between components; even if one indicator or switching transistor fails, the remaining modules can still operate normally, improving the circuit's fault tolerance and reliability.

[0009] The MCU control unit serves as the core, receiving signals from the IMU array (inertial measurement unit, including accelerometers, gyroscopes, etc.) and the Bluetooth module. It can analyze the device's operating parameters (such as attitude accuracy, data transmission status, communication connection quality, etc.) in real time and automatically trigger corresponding audio-visual prompts according to preset logic.

[0010] Both LEDs and switching transistors are low-power components. Combined with the precise control of the MCU, such as turning off some indicator lights when not needed and using short-duration voice prompts, the impact of the circuit on the overall power consumption of the inertial navigation device can be reduced, making it particularly suitable for battery-powered portable inertial navigation devices. At the same time, the circuit structure is simple, without complex filtering or amplification modules, and the components are universally compatible, reducing hardware costs and the probability of failure, thus meeting the long-term stable operation requirements of inertial navigation devices in complex environments such as industrial and outdoor settings.

[0011] As a feasible preferred embodiment, the indicator module includes a red LED, a green LED, and a blue LED; the red LED is connected in series with a 100Ω current-limiting resistor, the green LED is connected in series with a 680Ω current-limiting resistor, and the blue LED is connected in series with a 390Ω current-limiting resistor.

[0012] As a feasible preferred solution, the independent switching transistor is an NPN transistor. The base of the NPN transistor is connected to the GPIO pin of the MCU through a current-limiting resistor, the emitter is grounded, and the collector is connected to the cathode of the corresponding LED.

[0013] As a preferred feasible option, the indicator module is located on the top or side of the device housing.

[0014] As a feasible preferred embodiment, the MCU control unit communicates via I... 2 The C / SPI interface communicates with the IMU array to acquire the device's acceleration and angular velocity data in real time; the MCU control unit interacts with the Bluetooth module through the UART / Bluetooth protocol stack; the MCU control unit reads the battery voltage of the power management module through the ADC interface or a dedicated power detection chip.

[0015] As a feasible preferred embodiment, the MCU control unit is located on the device motherboard and is connected to other modules via wires on the printed circuit board.

[0016] As a feasible preferred solution, a power management module is also included, which includes a battery and voltage regulator circuitry to provide stable power to the MCU, IMU array, Bluetooth module, and indicator light module.

[0017] As a feasible preferred embodiment, the IMU array includes a MEMS sensor combination of a 3-axis accelerometer and a 3-axis gyroscope, fixed at the center of the device.

[0018] As a feasible preferred solution, the Bluetooth module is integrated on the motherboard near the antenna. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of an audible and visual prompting circuit for an inertial navigation measurement device. Detailed Implementation

[0020] To make the technical solution and advantages of this application clearer, the technical solution of this utility model will be further described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only some embodiments of this utility model, and are only used to explain this application, not to limit it. It should be noted that the technical features or combinations of technical features described in the following embodiments should not be considered isolated; they can be combined with each other to achieve better technical effects. The same reference numerals appearing in the accompanying drawings of the following embodiments represent the same features or components, and can be applied to different embodiments.

[0021] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "set" and "connection" should be interpreted broadly. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection (including various forms of mechanical connection, such as couplings or gear pairs), or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0022] Furthermore, unless otherwise defined, the technical or scientific terms used in this description shall have the ordinary meaning as understood by one of ordinary skill in the art to which this invention pertains.

[0023] The present invention will now be described in further detail with reference to the accompanying drawings: An audible and visual prompting circuit for an inertial navigation measurement device is mainly used in an inertial measurement device that includes an MCU (microcontroller unit), a power management module, an IMU array (inertial measurement unit array), a Bluetooth module, and an indicator light module. This device is mainly used for outdoor portable measurement and mapping.

[0024] An audible and visual prompting circuit for an inertial navigation measurement device includes an indicator light module, a current-limiting resistor, a transistor drive circuit, a voice prompt module, and an MCU control unit.

[0025] The indicator light module includes multiple light-emitting diodes (LEDs) of different colors. In this embodiment, red, green, and blue LEDs are preferred, each connected to the circuit through a different current-limiting resistor. The indicator light module is preferably located in a prominent position on the device casing for easy observation by the user.

[0026] Specifically, referring to Figure 1, the anode (positive terminal) of each chip is connected to the power supply (usually 3.3V or 5V, matching the MCU power supply voltage) through a current-limiting resistor, and the cathode (negative terminal) is grounded through an independent switching transistor (transistor).

[0027] Since the forward voltages of the three LEDs in the tri-color lamp are different, and the light intensity of different colors is different when the current is the same, and considering that the human eye is more sensitive to different colors of light (the human eye is most sensitive to red light, followed by blue light, and green light is relatively weaker), in this embodiment, the red LED is connected in series with a 100Ω current-limiting resistor, the green LED is connected in series with a 680Ω current-limiting resistor, and the blue LED is connected in series with a 390Ω current-limiting resistor.

[0028] The current-limiting resistor is set by taking into account the differences in human eye sensitivity to different colors of light, as well as the forward voltage of the light-emitting diode (approximately 1.8-2.2V for red light, approximately 2.8-3.2V for green light, and approximately 3.0-3.4V for blue light) and light intensity characteristics.

[0029] Current-limiting resistors are connected in series in their respective LED circuits to limit current and protect the LEDs. Their resistance values ​​are selected based on the characteristics of the LEDs to ensure that the LEDs can emit light stably and with appropriate brightness under different operating conditions.

[0030] Each LED cathode is connected to an NPN transistor (in this embodiment, model DTC114EUA, a small-signal high-speed switching transistor). The base of the transistor is connected to the MCU's GPIO pin through a current-limiting resistor, the emitter is grounded, and the collector is connected to the corresponding LED cathode. When the MCU outputs a high level to the transistor's base, the transistor conducts, pulling the LED cathode low to ground, and the LED lights up; when the MCU outputs a low level, the transistor is cut off, and the LED turns off. Isolating the LED load from the MCU GPIO reduces the MCU's drive current burden, avoids overcurrent on the pins caused by directly driving the LED, and protects the MCU from reverse voltage surges from the LED.

[0031] The voice prompt module is connected to the MCU, which controls the playback of different voice prompts. It has several built-in preset voices, such as "Connection initialization," "Connection successful," and "Low battery," and automatically plays the appropriate voice prompt based on the device's status. The voice prompt module is located inside the device and outputs sound to the outside via a speaker, ensuring the user can clearly hear the prompts. The MCU is the core of the audio-visual prompt circuit. It is used to receive signals from sensors such as IMU array and Bluetooth module, and control the operation of indicator module and voice prompt module according to preset logic.

[0032] The MCU determines the device status through its internal program, such as power-on, Bluetooth connection, stationary, moving, and timeout warning, and outputs corresponding control signals to the transistor driver circuit and voice prompt module.

[0033] Specifically, through I 2The C / SPI interface communicates with the IMU array to acquire motion data such as acceleration and angular velocity of the device in real time, which is used to determine the stationary / moving state and provide timeout warnings; the MCU interacts with the Bluetooth module through the UART / Bluetooth protocol stack to detect the Bluetooth connection status, which includes connected / not connected. The MCU reads the battery voltage of the power management module through the ADC interface or a dedicated power detection chip to determine if the power is too low. If it is below 3.3V, a low power warning is triggered. When a specific state is detected, the MCU outputs a control signal to the base of the transistor through the GPIO pin to control the three-color LED to turn on / off / blink. At the same time, it outputs corresponding voice prompts, such as "Bluetooth connection successful" or "Please charge in time", through the built-in audio codec or by connecting an external buzzer / voice chip.

[0034] The MCU control unit is located on the device's motherboard and is connected to other modules via wires on the printed circuit board (PCB) to ensure the stability and reliability of signal transmission.

[0035] Specifically, the power management module, including the battery and voltage regulator circuit, is preferably located on the internal motherboard of the device, providing stable power to the MCU (operating voltage 3.3V), IMU array (typically 1.8-3.3V), Bluetooth module (3.3V), and indicator module (3.3V / 5V); The IMU array, which includes a MEMS sensor combination of a 3-axis accelerometer and a 3-axis gyroscope, is fixed at the center of the device to reduce interference from housing vibration and is connected to the MCU via a flexible circuit board. The Bluetooth module is integrated on the motherboard near the antenna. Usually, metal contacts or PCB antennas are reserved on the top of the casing to ensure the stability of wireless signal transmission. The indicator light module is installed on the top or side of the device casing for easy and intuitive observation of the light color and flashing status.

[0036] The specific workflow is as follows: After the device is powered on, the MCU detects the startup status of each module and controls the blue and green lights to be constantly lit simultaneously (by driving the transistor to conduct through the corresponding GPIO output high level), while playing a voice prompt "Device connection initialization in progress..."; if the battery voltage is detected to be lower than the threshold (e.g., 3.3V), the purple light (achieved by mixing the blue and red lights simultaneously) will be constantly lit to indicate low battery.

[0037] Once the Bluetooth module is successfully paired with an external terminal (such as a mobile phone / tablet), the MCU controls the blue light to stay on (corresponding to a high level output from the GPIO) and plays a voice prompt "Bluetooth connection successful".

[0038] When stationary, if the IMU data shows that both acceleration and angular velocity are less than the threshold (e.g., acceleration < 0.1g, angular velocity < 0.05° / s), the MCU determines that the device is stationary, controls the green light to remain on (corresponding to a high-level GPIO output), and there is no voice prompt. When the device is in motion and the IMU data exceeds the static threshold, the MCU determines that the device is moving and controls the blue light to flash at a frequency of 1Hz (GPIO periodically outputs high / low level, with a period of 1 second), while playing a voice prompt at the basic frequency (such as "Device in motion"). Overtime warning: If the device continues to move for more than the preset time (e.g., not stopping for 30 minutes), the MCU controls the yellow light (a mixture of blue and green light or an independent yellow LED) to flash rapidly (frequency 5Hz) to remind the user to pay attention to fatigue; if the timeout is further exceeded (e.g., not stopping for 60 minutes), the red light is controlled to flash rapidly (frequency 10Hz) and an urgent voice prompt is issued (e.g., "Please stop immediately and check the device"). Exercise duration is linked to prompts. During exercise, the MCU dynamically adjusts the frequency of voice prompts based on the exercise time (e.g., a 2-second interval for 10 minutes of exercise, and a 0.5-second interval for 30 minutes of exercise), and the frequency of blue light flashing increases synchronously to enhance the sense of urgency.

[0039] The above content is merely an embodiment of this utility model. Commonly known structures and characteristics are not described in detail here. Those skilled in the art are aware of all common technical knowledge in the field prior to the application date or priority date, are aware of all existing technologies in that field, and have the ability to apply conventional experimental methods prior to that date. Those skilled in the art can improve and implement this solution based on the guidance provided in this application and their own capabilities. Typical known structures or methods should not be obstacles for those skilled in the art to implement this application. It should be noted that those skilled in the art can make several modifications and improvements without departing from the structure of this utility model. These should also be considered within the scope of protection of this utility model, and will not affect the effectiveness of the implementation of this utility model or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. An acoustic-optic prompting circuit for an inertial navigation measuring device, characterized in that: include: The indicator module includes multiple light-emitting diodes of different colors. The anodes of the light-emitting diodes are connected to the power supply through a current-limiting resistor, and the cathodes are grounded through independent switching transistors. The voice prompt module is used to play preset voice prompt messages; The MCU control unit, connected to the indicator module and the voice prompt module, is used to receive signals from the IMU array and the Bluetooth module, and control the operation of the indicator module and the voice prompt module according to preset logic; The MCU control unit communicates with the IMU array through I 2 The C / SPI interface communicates with the IMU array to obtain acceleration and angular velocity data of the device in real time; the MCU control unit interacts with the Bluetooth module through a UART / Bluetooth protocol stack; and the MCU control unit reads the battery voltage of the power management module through an ADC interface or a special power detection chip.

2. The sound-light prompting circuit of the inertial navigation measurement equipment according to claim 1, characterized in that: The indicator module includes a red LED, a green LED, and a blue LED; the red LED is connected in series with a 100Ω current-limiting resistor, the green LED is connected in series with a 680Ω current-limiting resistor, and the blue LED is connected in series with a 390Ω current-limiting resistor.

3. The sound-light prompting circuit of the inertial navigation measurement equipment according to claim 1 or 2, characterized in that: The independent switching transistor is an NPN transistor. The base of the NPN transistor is connected to the GPIO pin of the MCU through a current-limiting resistor, the emitter is grounded, and the collector is connected to the cathode of the corresponding LED.

4. The sound-light prompting circuit of the inertial navigation measurement device according to claim 1, characterized in that: The indicator light module is located on the top or side of the device housing.

5. The sound-light prompting circuit of the inertial navigation measurement device according to claim 1, characterized in that: The MCU control unit is located on the device motherboard and is connected to each module via wires on the printed circuit board.

6. The sound-light prompting circuit of the inertial navigation measurement device according to claim 1, characterized in that: It also includes a power management module, which includes a battery and voltage regulator circuitry to provide stable power to the MCU, IMU array, Bluetooth module and indicator light module.

7. The sound-light prompting circuit of the inertial navigation measurement device according to claim 1, characterized in that: The IMU array comprises a MEMS sensor combination of a 3-axis accelerometer and a 3-axis gyroscope, fixed at the center of the device.

8. The sound-light prompting circuit of the inertial navigation measurement device according to claim 1, characterized in that: The Bluetooth module is integrated on the motherboard near the antenna.

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