The Seeit 4 channel interface board which can control various appliances, and other equipments by its relay modules with each input of the interface is isolated by photo coupler and is controlled directly by microcontroller pcb card like Raspberry Pi, Arduino, 8051, AVR ,PIC, DSP, ARM, MSP430 or all other TTL logic signals.
Required power supply 5Vdc, 250mA Controls signals voltage active at TTL low state Drive current 20 mA max for each input
