Relay Board - 4 Channel
12V operated, 5V controlled, can switch mains voltages
The board has four relays driven by ULN2803 IC. The board works on 12V but the input signal can come directly from microcontroller output working at 3V or 5V to control relays. Each relay can switch varierty of AC or DC high voltage, high current loads working at 110V or 220V AC mains like lights, fans, motors and such. The status of relay is indicated by individual LEDs.