Keyes funduino relay board schematic
for Raspberry-pi or Arduino
Having trouble connecting this board to your raspberry-pi? Take a look at this schematic, it's easy to connect if you know how the board is wired....
I've been looking around on the internet and couldn't find it, so I took a look at this board and have drawn it myself. It might help you......
This is the schematic of only 1 port, there are 4 identical circuits at a 4 relay board and 8 circuits at an 8 relay board, except for the power led.
Be aware that the relays should be connected to 5V, since this is the coil voltage... But check to be sure.