I am using an 8 Relay module, bought from dx.com. It has no instruction manual...
This board has 8 inputs (IN1,...,IN8) to control each relay, 1 VCC pin that requires 5V and 1 GND pin.
I connected the VCC to the 5V pin of the raspberry and the GND to the ground of the raspberry. After that I tested each relay by connecting them to a GPIO-pin as I saw other people doing it: video
But only 2 of the 8 relays seem to work fine. The indication lights of the other 6 do change, but the relays don't 'click'.
Is somebody experiencing the same problem, or does anybody know how to fix this? Thanks in advance!