Review on π 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 Jenna Morocho
Two out of three worked out of the box.
Two of the three relay boards worked as expected immediately after installation. Other reviewers had similar issues. I checked the signal paths with an oscilloscope and noticed that two pins are shorted due to a solder jumper on the bottom of the board. After I scraped off the solder jumper with a small screwdriver, the board worked as it should. I would have given 5 stars if it wasn't for the post production quality control. I would buy again.
- Easy to use
- Protection
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