Specifications:

• Power supply voltage: +5V
• Power On LED light: LED1
• Electret Condenser Microphone (ECM) sensor
• 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)

Operation:

The operation of this module involves the following pin configurations: 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 light up when power is applied; Turn the potentiometer counter-clockwise until LED2 turns off, which indicates the sound threshold; then adjust to the appropriate threshold for your application. Notably, this module's electret microphone is not very sensitive; it is meant to detect loud noises (such as door slams, glass breakage, dogs barking, doorbells, alarms, buzzers, etc.); it is not meant to detect low-level sounds like voice conversations.