About the Project
It’s pretty simple to control the brightness of an LED, just give it a PWM signal and change the brightness. But what about a Bulb that runs on AC current? Its brightness won’t be controlled by giving it PWM signals. It will require some additional circuits and, in this article, I’ll be talking all about the AC dimming process and making.

Components Required
BT136 TRIAC
10KΩ Resistor
MOC3021 IC
Arduino Board
MCT2e IC
2 Pin Terminal
47KΩ 1W Resistor
Heat Sink
330Ω Resistor x2
1KΩ Resistor

Working Principle
In this project, I’m using the Leading-Edge Phase Dimming Method to lower down the output power.
In the circuit, we have one zero-cross detector which gives the signal to the Arduino board whenever the signal crosses the zero value.
A zero-cross detector is used as a reference to change the phase of the signal. By delivering the power for less than 100%, we cut down the amount of power delivered