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8 Opto-isolated Relay board
- Dr. Ayman Shalaby
- aimanshalpy@gmail.com
- 14.084 Views
- medium
- Non tested
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.
Schematic
The full schematic is shown below
Photos
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What is the capacitance of c2?
You can use a small -non polarized capacitor like 10nF