🔌 Latest Raspberry Pi 8-Channel Relay Expansion Board with 5V Power Relay Module for Raspberry Pi 4 3 2 Model B+ B Jetson Nano - XYSGStudy Review

No documentation, but the GPIO to relay mapping is on the circuit board under the yellow jumpers. This is misleading as they are marked as P5, P6, P13, P16, P19, P20, P21, P26 but they are actually GPIO, GPIO5, GPIO6, GPIO13 etc numbers not PI pin numbers.

Well-made board. Pi is stuck. The DIN mount is strong. I've checked the relay every day and haven't had any problems for the past month.

Well done circuit board. Pi is stuck. The DIN mount is strong. I've checked the relay every day and haven't had any problems for the last month.

I mean nothing. Not even a piece of paper with a link. Literally nothing. I'm assuming it's driven by four GPIO pins, but which ones? Everyone needs to be tested. The rest looks pretty solid. I don't know if it works yet. I asked the seller a question but there was no reply.

No documentation, but GPIO to relay mapping is set on the board on the bottom of the yellow jumpers. This is misleading as they are marked as P5, P6, P13, P16, P19, P20, P21, P26 but they are actually GPIO, GPIO5, GPIO6, GPIO13 etc numbers not PI pin numbers.

Overall good design and works well. In my opinion good value for money. As others have pointed out, documentation is not included. With the RPI4, the pin numbers and the corresponding relay assignments are listed here. Sorry I didn't bother to write down the pin vs GPIO. 29=131=233=336=435=538=640=737=8 Works great; Currently my production server/relay is Node-RED. No questions.