Toy with low-power-consumption human body detection device
By combining human body radar sensors and pyroelectric motion sensors into the logic gate circuits of toys, a toy design with high-precision human body recognition and low power consumption is achieved, solving the problems of poor sensing accuracy and high power consumption in existing technologies and improving the user experience of toys.
Patent Information
- Application Number
- CN202522070644.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-09-26
- Publication Date
- 2025-11-11
- Estimated Expiration
- 2035-09-26
AI Technical Summary
Existing toys using human body sensors suffer from poor sensing accuracy and high power consumption. In particular, human body radar sensors are prone to misjudgment, leading to rapid battery drain.
The system employs a combination of human body radar sensors and pyroelectric motion sensors, using logic gate circuits to achieve accurate judgment. Under normal conditions, only the human body radar sensor is in standby mode, while the pyroelectric motion sensor is powered on only after detecting a human body. Combined with MCU control of the load, the system power consumption is reduced.
It achieves high-precision human body recognition and low power consumption, reducing battery consumption and improving the user experience of toys.
Smart Images
Figure CN223538994U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of toys, and more particularly to a toy with a low-power human body detection device. Background Technology
[0002] With the development of technology, intelligent toys have become a mainstream trend. Sensors and microcontrollers are widely used in toy production, especially human body sensing sensors, which enable toys to react instantly after sensing a human body, greatly improving the interactive effect of toys and making them more fun.
[0003] However, existing toys often suffer from poor accuracy when using human body sensors. Even when set up alone, existing human body radar sensors can still misjudge moving objects in the environment. To solve this problem, some manufacturers add infrared motion sensors to human body radar sensors for comprehensive judgment, thereby improving the accuracy of human body detection. However, this brings a second problem: high system power consumption. In order to maintain the human body detection function, both sensors need to be in standby mode for a long time, and they continue to consume power even when no human body is nearby. Moreover, since most toys are powered by batteries, if they are not used for a long time, the sensors will quickly consume the battery power in the long standby mode, requiring frequent battery replacements, which affects the child's user experience.
[0004] To address the aforementioned issues, this solution designs a toy with a low-power human body detection device. Utility Model Content
[0005] To address the aforementioned technical problems, this utility model provides a toy with a low-power human body detection device, comprising: a power supply, a human body radar sensor, a pyroelectric motion sensor, a logic gate circuit, and an MCU.
[0006] The power supply is electrically connected to the human body radar sensor and the MCU, and is connected to the pyroelectric motion sensor via a normally open power switch. The human body radar sensor controls the normally open power switch. The output terminals of the human body radar sensor and the pyroelectric motion sensor are connected to the logic gate circuit. The logic gate circuit is electrically connected to and controls the MCU. When the human body radar sensor is working, it can control the normally open power switch to close, thereby energizing the pyroelectric motion sensor. After the pyroelectric motion sensor senses a human body signal, it and the human body radar sensor simultaneously emit a high-level signal. After judgment by the logic gate circuit, the MCU is awakened, and then the MCU controls its connected load to work.
[0007] The logic gate circuit is an AND gate circuit. When the two input terminals of the logic gate circuit simultaneously receive high-level signals from the pyroelectric motion sensor and the human body radar sensor, the logic gate circuit emits a rising edge signal.
[0008] The signal output terminals of the human body radar sensor and the pyroelectric motion sensor are both equipped with filtering and modulation circuits, which are used to modulate the high-level signals output by the human body radar sensor and the pyroelectric motion sensor.
[0009] The load includes: a light-emitting diode, a buzzer module, and a wireless communication module. The buzzer module includes: a buzzer driver circuit and a buzzer. The buzzer driver circuit is electrically connected to the buzzer, so that when the MCU is woken up, the buzzer driver circuit controls the buzzer to work.
[0010] The wireless communication module is either a Bluetooth module or a WIFI module.
[0011] It also includes a power detection module, which includes: a first voltage divider resistor and a second voltage divider resistor, both of which are 2MΩ, and a middle capacitor of 100nF. The midpoint of the first voltage divider resistor and the second voltage divider resistor is electrically connected to the ADC terminal of the microcontroller.
[0012] Furthermore, the MCU samples the voltage divider signal through the ADC terminal. When it detects that the power of the power supply is lower than a preset threshold, it can control the light-emitting diode to flash or send a low power reminder through the wireless communication module.
[0013] The power source is a lithium battery.
[0014] A low-dropout regulator is connected in series at the output terminal of the power supply.
[0015] The MCU is an 8051 microcontroller.
[0016] Implementing this utility model embodiment has the following beneficial effects: 1. High human body recognition accuracy: After detecting a human body through a human body radar sensor, a pyroelectric motion sensor is simultaneously activated by a normally open power switch to assist in human body detection. The combined sensing of the two sensors enables accurate human body identification. 2. Low system power consumption: Under normal conditions, only the human body radar sensor is in standby mode, while the pyroelectric motion sensor and the microcontroller gas collection load are in dormant mode. Only when the human body sensor detects a human body and controls the normally open power switch to close, energizing the pyroelectric motion sensor and triggering its detection of a human body, will the microcontroller be woken up via a logic gate circuit, enabling the microcontroller and load to operate. Attached Figure Description
[0017] Figure 1 This is a circuit diagram of this utility model;
[0018] Figure 2 This is a schematic diagram of the sensor and logic gate circuit of this utility model;
[0019] Figure 3 This is a schematic diagram of the buzzer module of this utility model;
[0020] Figure 4 This is a schematic diagram of the wireless communication module of this utility model;
[0021] Figure 5 This is a schematic diagram of the power detection module of this utility model. Detailed Implementation
[0022] To make the objectives, technical solutions and advantages of this utility model clearer, the utility model will be described in further detail below with reference to the accompanying drawings.
[0023] like Figures 1-2 As shown, a toy with a low-power human body detection device includes a power supply 1, a human body radar sensor 2, a pyroelectric motion sensor 3, a logic gate circuit 4, and an MCU 5.
[0024] The power supply 1 is electrically connected to the human body radar sensor 2, the pyroelectric motion sensor 3, and the MCU 5. The power supply 1 and the pyroelectric motion sensor 3 are connected in series with a normally open power switch 11. The human body radar sensor 2 is controlled by the normally open power switch 11. The output terminals of the human body radar sensor 2 and the pyroelectric motion sensor 3 are connected to the logic gate circuit 4. The logic gate circuit 4 is connected to and controls the MCU 5. When the human body radar sensor 2 senses a human body, it closes the normally open power switch 11 and powers the pyroelectric motion sensor 3. The pyroelectric motion sensor 3 and the human body radar sensor 2 work synchronously and emit a high-level signal. After judgment, the logic gate circuit 4 wakes up the MCU 5, and then the MCU 5 controls its connected load to work.
[0025] Specifically, the logic gate circuit 4 is an AND gate circuit. After receiving the high-level signals output by the human body radar sensor 2 and the pyroelectric motion sensor 3, its two input terminals can be judged to output a high level and wake up the MCU5. Then, the MCU5 controls various loads to work.
[0026] Reference Figure 1The power supply 1 is a lithium battery. The power supply 1 is connected in series with a low dropout voltage regulator 12 and has four output terminals. The four output terminals are respectively connected to the human body radar sensor 2, MCU 5, pyroelectric motion sensor 3 and wireless communication module 63 which can be controlled by a normally open power switch.
[0027] In this embodiment, the low-dropout regulator 12 is model MD7218, which can modulate the output of power supply 1 to a regulated output of 3.3V.
[0028] Please refer to Figure 2 In this embodiment, the human body radar sensor is model Rd-03L manufactured by Anxinke, and the pyroelectric motion sensor is model AM412. By combining the judgment of the two sensors, the accuracy of the system in sensing the human body can be greatly improved.
[0029] Specifically, the signal output terminals of the human body radar sensor 2 and the pyroelectric motion sensor 3 are both equipped with filtering and modulation circuits, which are used to modulate the high-level signals output by the human body radar sensor and the pyroelectric motion sensor.
[0030] In this embodiment, the filtering and modulation circuit consists of a 10Ω resistor, a 104Ω filter capacitor (100nF), and a Schmitt trigger. This embodiment uses an SN74LVC2G14DBVR. The high-level signals output by the human body radar sensor 2 and the pyroelectric motion sensor 3 are suppressed by the 10Ω resistor, resulting in a more stable level. At the same time, they undergo high-frequency filtering by the filter capacitor, and then are shaped by two stages of Schmitt triggers to obtain a stable and reliable high-level signal, which is then input to the logic gate circuit.
[0031] like Figure 3 As shown, the load includes: a light-emitting diode 61, a buzzer module 62, and a wireless communication module 63. The buzzer module 62 includes: a buzzer driver circuit 621 and a buzzer 622. The buzzer driver circuit 621 is electrically connected to the buzzer 622, so that when the MCU5 is woken up, the buzzer 622 can be controlled to work through the buzzer driver circuit 621.
[0032] It should be noted that the buzzer 622 in this embodiment is a piezoelectric passive buzzer, and it is driven and controlled by a buzzer driver circuit 621. Therefore, the buzzer 622 is not powered under normal conditions, making the entire system more energy-efficient. In addition, the light-emitting diode 61, through a 10k current-limiting resistor, and by reasonably configuring the hardware PWM duty cycle and PWM period, can achieve good display effects while reducing power consumption.
[0033] The buzzer driver circuit 621 is a multi-mode piezoelectric buzzer driver integrated circuit. In this embodiment, DC009 is used. Its charge pump circuit has 1x, 2x, and 3x boost switching functions, which can meet the design scheme of most 3V battery-powered buzzers with high sound pressure output. When no DIN input signal is detected, the internal circuit can stop working, thereby further reducing the system power consumption.
[0034] like Figure 4 As shown, the wireless communication module in this embodiment is a Bluetooth module, model RC6626A. Of course, it can also be a WIFI module. Compared with WIFI, the Bluetooth module has lower power consumption.
[0035] like Figure 5 As shown, the system also includes a power detection module 7, which comprises a first voltage divider resistor 71 and a second voltage divider resistor 72. In this embodiment, the resistance of the first voltage divider resistor 71 and the second voltage divider resistor 72 is 2MΩ, and their accuracy is 1%. The midpoint of the first voltage divider resistor 71 and the second voltage divider resistor 72 is electrically connected to the ADC terminal of the MCU, so that the MCU can sample the power supply current after voltage division and read the remaining power of the power supply. Simultaneously, an intermediate capacitor 73 is connected in parallel to the power detection module 7. In this embodiment, the intermediate capacitor is 100nF. The intermediate capacitor in this embodiment is used to make the power value read by the ADC terminal more stable and accurate.
[0036] The MCU5 samples the voltage divider signal through the ADC terminal. When it detects that the power of the power supply 1 is lower than a preset threshold, it can control the light-emitting diode 61 to flash or send a low power reminder through the wireless communication module 63.
[0037] Specifically, the MCU5 is an 8051 microcontroller.
[0038] Operating principle:
[0039] Please refer to Figure 1 and Figure 2 Under normal conditions, the human body radar sensor 2 is in working condition. When a human body is detected approaching, the human body radar sensor 2 can output the first-level signal ROUT1. When ROUT1 is high, it means that a human body has been detected and is defined as an effective level. When ROUT1 is low, it means that no human body has been detected and is defined as an invalid level.
[0040] When the human body radar sensor 2 detects a human body and sends a high-level ROUT1 signal, it controls the normally open power switch 11 to close. At the same time, the pyroelectric motion sensor 3 activates and synchronously sends a high-level ROUT1 signal. At this time, the two high-level ROUT1 signals are filtered by a 10Ω resistor and a filter capacitor, and then input to a Schmitt trigger for shaping, and converted into a high-level ROUT2 signal. This signal is then input to the two input terminals of an AND gate circuit. The AND gate circuit outputs a high-level SOUT signal and wakes up the MCU 5. The MCU 5 controls the wireless communication module 63 to upload the human body's approach status to an external terminal and controls the LED 61 or the buzzer module 62 to activate.
[0041] When the human body leaves, the high-level signal ROUT1 emitted by the human body radar sensor 2 and the pyroelectric motion sensor 3 is converted into a low-level signal ROUT1. At this time, the output of the AND gate circuit outputs a low-level SOUT, controlling the MCU5 to enter a sleep state.
[0042] Of course, if users have higher requirements for power consumption, the MCU5 can also enter sleep mode in advance after being woken up and completing the load drive, without waiting for the SOUT signal to go low, which can further reduce system power consumption.
[0043] This solution is mainly applied to interactive toys such as plush toys or dolls. After sensing human signals, it can communicate with the user or take corresponding actions, thereby realizing the automatic triggering and active interaction of toy behavior.
[0044] The core improvement of this solution is that the human body radar sensor 2 acts as a pre-trigger, only powering on the pyroelectric motion sensor 3 after detecting a human body. Under normal conditions, the normally open power switch 11 is in the off state, so the pyroelectric motion sensor 3 is in the off state, and only the human body radar sensor 2 is in the standby working state. When the human body radar sensor 2 senses a human body, it controls the normally open power switch 11 to close, so that the pyroelectric motion sensor 3 is powered on and the MCU is awakened. Thus, when this solution is implemented on plush toys or dolls, it can achieve accurate human body sensing while reducing energy consumption.
[0045] Of course, the above embodiments are only for illustrating the technical concept and features of this utility model, and their purpose is to enable those skilled in the art to understand the content of this utility model and implement it accordingly. They should not be used to limit the protection scope of this utility model. All modifications made in accordance with the spirit and essence of the main technical solution of this utility model should be covered within the protection scope of this utility model.
Claims
1. A toy with a low-power human body detection device, characterized in that, include: Power supply (1), human body radar sensor (2), pyroelectric motion sensor (3), logic gate circuit (4) and MCU (5); The power supply (1) is electrically connected to the human body radar sensor (2), the pyroelectric motion sensor (3) and the MCU (5). The power supply (1) and the pyroelectric motion sensor (3) are connected in series with a normally open power switch (11). The human body radar sensor (2) is connected to the normally open power switch (11). The output terminals of the human body radar sensor (2) and the pyroelectric motion sensor (3) are connected to the logic gate circuit (4). The logic gate circuit (4) is connected to and controls the MCU (5). When the human body radar sensor (2) senses a human body, the normally open power switch (11) is closed and the pyroelectric motion sensor (3) is powered. The pyroelectric motion sensor (3) and the human body radar sensor (2) work synchronously and emit a high-level signal. After judgment, the logic gate circuit (4) wakes up the MCU (5) through a rising edge signal, and then the MCU (5) controls the load connected to it to work.
2. A toy with a low-power human body detection device according to claim 1, characterized in that, The logic gate circuit (4) is an AND gate circuit. When the two input terminals of the logic gate circuit (4) simultaneously receive high-level signals from the pyroelectric motion sensor (3) and the human body radar sensor (2), the logic gate circuit (4) emits a rising edge signal.
3. A toy with a low-power human body detection device according to claim 1, characterized in that, The signal output terminals of the human body radar sensor (2) and the pyroelectric motion sensor (3) are both equipped with filtering and modulation circuits. The filtering and modulation circuits are used to modulate the high-level signals output by the human body radar sensor and the pyroelectric motion sensor.
4. A toy with a low-power human body detection device according to claim 1, characterized in that, The load includes: a light-emitting diode (61), a buzzer module (62), and a wireless communication module (63). The buzzer module (62) includes a buzzer drive circuit (621) and a buzzer (622). The buzzer drive circuit (621) is electrically connected to the buzzer (622), so that when the MCU (5) is woken up, the buzzer drive circuit (621) can control the buzzer (622) to work.
5. A toy with a low-power human body detection device according to claim 4, characterized in that, The wireless communication module (63) is either a Bluetooth module or a WIFI module.
6. A toy with a low-power human body detection device according to claim 5, characterized in that, It also includes a power detection module (7), which includes a first voltage divider resistor (71) and a second voltage divider resistor (72), and the midpoint of the first voltage divider resistor (71) and the second voltage divider resistor (72) is electrically connected to the ADC terminal of the microcontroller. Furthermore, the MCU (5) samples the voltage divider signal through the ADC terminal. When it detects that the power of the power supply (1) is lower than the preset threshold, it can control the light-emitting diode (61) to flash or send a low power reminder through the wireless communication module (63).
7. A toy with a low-power human body detection device according to claim 1, characterized in that, The power source (1) is a lithium battery.
8. A toy with a low-power human body detection device according to claim 1, characterized in that, A low-dropout regulator (12) is connected in series at the output terminal of the power supply (1).
9. A toy with a low-power human body detection device according to claim 1, characterized in that, The MCU (5) is an 8051 microcontroller.