Review on 🌐 MCIGICM 2 Channel DC 5V Relay Module: Optocoupler Low Level Trigger Expansion Board for Arduino UNO R3, DSP, ARM, PIC, AVR, STM32, Raspberry Pi by Renee Carfindergirl

Name: 🌐 MCIGICM 2 Channel DC 5V Relay Module: Optocoupler Low Level Trigger Expansion Board for Arduino UNO R3, DSP, ARM, PIC, AVR, STM32, Raspberry Pi
Item: 🌐 MCIGICM 2 Channel DC 5V Relay Module: Optocoupler Low Level Trigger Expansion Board for Arduino UNO R3, DSP, ARM, PIC, AVR, STM32, Raspberry Pi
Rating: 5

October 22, 2022

Don't buy them if you don't need a broken crap.

2/3 failed. One was shorted somewhere in the circuit between VCC and ground. One had a marker that popped out. The third worked. If you are using an RPi you will need to use an NPN transistor for grounding. It doesn't respond to the 3.3V that the RPi outputs in its GPIO, high or low. You need to use the middle pin in NPN and then use ground as the signal. But that assumes yours works. Maybe I just lost the lottery, but 2/3 is a terrible work rate.

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