Keyestudio ESP32 - 2. Working Principle; 3. Wiring Diagram

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ESP32 Starter Kit

2. Working Principle

When detecting a sound, the electret ﬁlm in microphone vibrates, which changes the capacitance and generates a subtle

change of voltage.

Next, we make use of LM3 chip to build a proper circuit to amplify the detected sound up, which can be adjusted by a

potentiometer. Rotate it clockwise to enlarge the times.

8.5. Arduino Project 121