AO = analog output provides a real-time output voltage signal of the microphone
DO = Digital output, output goes high when the intensity of the sound reaches threshold
Comparator Circuit: LM393
Comparator Output LED: LED2, on when sound reaches threshold
Built in potentiometer can be used to adjust the DO threshold level
Mounting screw hole size: 3mm
Circuit Board Dimensions: 35mm x 15mm x 14mm (L x W x H, excluding connector and microphone)
Pin + to +5VDC
Pin - to Ground
Pin AO to Microcontroller Analog Input (for analog program)
Pin DO to Microcontroller Digital Input (for digital program)
LED1 will illuminate when power is applied
Turn potentiometer counter-clockwise until LED2 turns off. This is the sound threshold. Then adjust to the appropriate threshold for your application.
NOTE: The electret microphone in this module is not extremely sensitive. It is designed to detect loud noises (door slams, glass breakage, dogs barking, doorbells, alarms, buzzers, etc.). It is not appropriate for detecting low levels sounds such as voice conversations.