Human body detection device and judging method thereof

Abstract

The invention relates to a human body detection device used for being coupled to a human body detection sensor. The human body detection sensor is used for resetting the electric level of a first preset period of time at every time delay. The device further comprises an edge triggering circuit, a timing circuit and a judging circuit. The edge triggering circuit is used for capturing a level edge signal outputted by the human body detection sensor and outputting a trigger signal to the judging circuit. The timing circuit is provided with a second preset time and is coupled to the judging circuit. On the condition that the judging circuit does not receive any trigger signal within an arbitrary second preset period of time, the judging circuit judges and outputs a first signal. On the condition that the judging circuit receives a trigger signal, the judging circuit outputs a second signal. The device is strong in applicability and the type of the senor does not need to be configured. Therefore, the normal signal output is guaranteed.

Description

technical field

[0001] The invention relates to the field of sensors, in particular to a human body detection device. Background technique

[0002] With the popularity of smart homes and smart facilities, human body detection technology has gradually entered people's sights. At present, the more common human body detection sensors include temperature sensors, pressure sensors, photoelectric sensors, acceleration sensors, pyroelectric sensors, etc. At present, The more common detection method, the type of output by the sensor has two states of high level and low level, and the two states can be set to be someone or no one through the circuit, but in this way, although the logic is more logical for the sensor itself Simple, but when the sensor is connected to the control chip, there is a problem. The control chip cannot judge the sensor type, so the user needs to input the corresponding configuration of the sensor in advance, which causes trouble for the user when using it, an...

Examples

Embodiment 2

[0026] Embodiment 2, the edge trigger circuit 110 is configured as a rising edge trigger circuit, the rising edge trigger circuit captures the rising edge of the output level of the human body detection sensor and outputs a trigger signal, corresponding to a normally open sensor, when the human body passes by A rising edge is triggered directly, and if the corresponding sensor is a normally closed sensor, the trigger time becomes the first preset time after the human body passes by, and it triggers instantly when the level is reset.

Embodiment 3

[0027]Embodiment 3, the edge trigger circuit 110 is configured as a falling edge trigger circuit, and the falling edge detection circuit captures the falling edge of the output level of the human body detection sensor and outputs a trigger signal. If it is a normally closed sensor, a falling edge will be triggered directly when the human body passes by, and if it is a normally open sensor, the trigger time will become the first preset time after the human body passes by, and it will be triggered instantly when the level is reset .

Embodiment 4

[0028] Embodiment 4, the edge trigger circuit 110 includes a rising edge trigger circuit or a falling edge trigger circuit arranged in parallel, the rising edge trigger circuit captures the human body detection sensor output level rising edge output trigger signal, the falling edge detection circuit Capture the falling edge of the output level of the human body detection sensor and output the trigger signal. With this design, when one passes, two trigger signals will be output, which can also meet the output conditions, and the corresponding response speeds of different types of sensors are the same.

technical field

[0001] The invention relates to the field of sensors, in particular to a human body detection device. Background technique

[0002] With the popularity of smart homes and smart facilities, human body detection technology has gradually entered people's sights. At present, the more common human body detection sensors include temperature sensors, pressure sensors, photoelectric sensors, acceleration sensors, pyroelectric sensors, etc. At present, The more common detection method, the type of output by the sensor has two states of high level and low level, and the two states can be set to be someone or no one through the circuit, but in this way, although the logic is more logical for the sensor itself Simple, but when the sensor is connected to the control chip, there is a problem. The control chip cannot judge the sensor type, so the user needs to input the corresponding configuration of the sensor in advance, which causes trouble for the user when using it, an...

Examples

Embodiment 2

[0026] Embodiment 2, the edge trigger circuit 110 is configured as a rising edge trigger circuit, the rising edge trigger circuit captures the rising edge of the output level of the human body detection sensor and outputs a trigger signal, corresponding to a normally open sensor, when the human body passes by A rising edge is triggered directly, and if the corresponding sensor is a normally closed sensor, the trigger time becomes the first preset time after the human body passes by, and it triggers instantly when the level is reset.

Embodiment 3

[0027]Embodiment 3, the edge trigger circuit 110 is configured as a falling edge trigger circuit, and the falling edge detection circuit captures the falling edge of the output level of the human body detection sensor and outputs a trigger signal. If it is a normally closed sensor, a falling edge will be triggered directly when the human body passes by, and if it is a normally open sensor, the trigger time will become the first preset time after the human body passes by, and it will be triggered instantly when the level is reset .

Embodiment 4

[0028] Embodiment 4, the edge trigger circuit 110 includes a rising edge trigger circuit or a falling edge trigger circuit arranged in parallel, the rising edge trigger circuit captures the human body detection sensor output level rising edge output trigger signal, the falling edge detection circuit Capture the falling edge of the output level of the human body detection sensor and output the trigger signal. With this design, when one passes, two trigger signals will be output, which can also meet the output conditions, and the corresponding response speeds of different types of sensors are the same.

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