4-Channel Relay Module basics
5 Volts 4 Channel relay module is an interface board that is compatible with Arduino, AVR, PIC, ARM etc. This module can work in high current like AC250V 10A or DC30V 10A. It controls larger loads and devices like DC motors, AC motors and other AC and DC devices with the digital outputs from controllers and processors. It is a 4-channel relay module, so it can control any 4 devices. Each relay or channel of 4 channel relay module needs 15-20mA driver current and 5 Volts supply.