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Description
1 detection sound intensity of the surrounding environment; Note: this sensor only identify the sound or not (according to the vibrate principle), does not recognize the voice size or specific frequency sound
2 adjustable sensitivity (blue digital chart potentiometer adjustment)
3 working voltage 3.3V-5V
4 output form: digital output (0 and 1 level)
5 provided with fixing bolt holes, easy to install
6 PCB size: 3.4cm * 1.6cm

Interface description (4 wire)
1 VCC external 3.3V-5V voltage (directly connect 5V MCU and 3.3V chip)
2 GND external GND
3 DO small board digital output interface (0 and 1)

Instructions for use
1 sound module is most sensitive to environmental sound intensity, generally used to sound intensity testing environment
2 module in environmental sound intensity are not up to the preset threshold, DO port output high level, when the sound intensity of external environment exceeds the preset threshold, module D0 output low level
3 small board digital output D0 can be directly connected with the MCU, the MCU to detect high level, thereby to detect environmental sounds
4 small board digital output DO can directly drive the relay module, which can be composed of a voice activated switch