This digital dimmer can be controlled by IR control

To do this project a zero crossing detector is necessary, there are many ways to do it, I use a 120v-12v transformer, a diode rectification bridge and a moc4n35 to create a zero crossing detector

How do we know when the AC wave crosses 0, we use this to send a high pulse to 3011 (MOC) and depending on how much power we want the delay time of this pulse will be

AC = 220@60Hz

1/60 = 1.6x10^-3 seconds //For a complete wave

1.6x10^-3 s/2 = 8.3x10^-3 seconds // This is the time for a half cycle wave

0 seconds delay = 100% power

8.3x10^-3 seconds delay = 0% power

long dimerTime = int(map(val,0,100,8000,150));
        Timer1.attachInterrupt(gate,dimerTime);
        Timer1.start();

Material list:

1x Arduino pro mini, nano, etc

1x Moc 4n35

1x Moc 3011

1x Bt138

1x Diode bridge

1x Transformer 220v/110v to 12v - 5v

1x IR receiver

2x 220 ohms resistor

1x 330 ohms resistor

1x Led

Diagram:

https://easyeda.com/Death27/light_controller

EXPANDED TECHNICAL DETAILS

Remote Spectral Illumination Control

This project provides a professional-grade AC dimming solution that can be adjusted using any standard infrared (IR) remote.

• Zero-Cross Detection Interface: The Arduino monitors the AC mains' sine wave using an opto-isolated zero-cross circuit. This ensures the firmware can time the TRIAC firing pulses perfectly with the 50Hz/60Hz frequency, preventing flicker.
• IR Protocol Decoding: Captures IR signals via a TSOP38238 receiver. The Arduino decodes the HEX codes for "Volume Up" (Brighten) and "Volume Down" (Dim) and translates them into precise microsecond delays for the TRIAC trigger.

Safety

• Galvanic AC Isolation: Uses an opto-TRIAC (e.g., MOC3021) to provide a 5,000V electrical barrier between the Arduino logic and the high-voltage AC load, ensuring user safety.