Home Projects MCU 8 Opto-isolated Relay board


8 Opto-isolated Relay board
author: Dr. Ayman Shalaby - aimanshalpygmail.com


This is a 8 channel relay interface board using ULN2803. All the relays are opto-isolated using optocouplers and can be controlled directly using a microcontroller of any kind (Arduino , 8051, AVR, PIC, DSP, ARM, ARM, MSP430, TTL logic) or a PC.

 It's easy to manufacture and have three pin screw terminals for easy connectivity.


The full schematic is shown below


click on schematic for full resolution


 PCB Design





Download Eagle design files

Download Gerber files


120x90 spot



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