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ESP32 Starter Kit
7.Code Explanation
Read the analog value of photoresistor by setting the pin.
9.2.24 Project 21: Sound Controlled LED
1. Description
Sound controlled LED is a device used to detect sound in a way that controls the brightness of LED, which is composed
of a Arduino board and some components. It can connect to multiple sensors such as microphones. It converts sound
to changing voltage signal to be received by Arduino to control the LED on and off.
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 LM386 chip to build a proper circuit to amplify the detected sound up to 200 times, which can
be adjusted by a potentiometer. Rotate it clockwise to enlarge the times.
9.2. Scratch Project
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