The main chip is LM393. Signal is clean, waveform is good, driving ability is strong. Build in potentiometer can be used to adjust the threshold level. When sound intensity exceed a certain threshold, produces low(Digital output 0) signal and light will be off, Otherwise output high(Digital output 1) signal and light will be bright.
Microphone Sensor Detection Module LM393
Main chip: LM393, Electret condenser microphone
Operating voltage: 3.3V ? 5V
Output Form: Digital output(0 or 1)
PCB Size: 32mm*17mm
VCC: connect 3.3V-5V voltage
OUT: signal output
VCC is connected to 3.3V-5V voltage (can be directly connected to 5V MCU or 3.3V MCU), GND is connected to GND, and the power indicator will be on. Place the module in a quiet environment, adjust the blue potentiometer on the board until the switch indicator on the board is on, then trim back the potentiometer until the switch indicator is off, then generate a sound (such as a high-five) on the sensor accessory, The switch indicator light will be lit again.
When sound intensity exceed a certain threshold, produces low(Digital output 0) signal and light will be off, Otherwise output high(Digital output 1) signal and light will be bright. The module digital output OUT can be directly connected to the MCU, through the MCU. The high and low levels are detected, thereby detecting the sound of the environment, so that a voice switch can be formed.