Review on π Huayao 2pcs 4 Channel 5V Relay Module with Optocoupler for Arduino UNO R3 MEGA 2560 1280 DSP ARM PIC AVR STM32 Raspberry Pi by Matt Weber
It works. It may have an additional ground contact.
Relay works properly. Solder joints are smooth and clean. I would like to see a ground pin next to VCC for the output side of the optocoupler. I'm not sure if the ground is isolated or not as you need to use the ground on the signal input side.
- Power indicator lights for safe use
- Not as thick as other picks
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