• 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:

• 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.