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channel SunFounder 5V 8 Channel Relay, which stopped working and I'm not sure if because something I did: The first time I connected to my pi everything worked, I powered the board from 5v pin of the pi and all 8 relays nicely clicked and turned on/off the built in leds, I didn't try with any other load.

Then I spent some time wiring up the rest of my setup (trying to build controllable power outlets) and when I was ready to test everything (meaning pi+relay board-outlets but not connected to AC) the leds are still lighting up but there is no switching.

Can it be that I damaged/scratched/burnt anything? I tried different power supplies, another pi board, but still nothing...

To clarify my question little bit, was the fact that it originally worked just a random luck? indeed I've read many similar treads about not enough power etc but at the same time have seen several successful cases. So wanted to know what could've changed between my 2 tries...

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This could mean wither of the two things one if you are powering from the 5V adapter the current required to operate the relay is not enough and it only turns on the LED or the driver in between your PI's GPIO and the Relay (transistor/ optocoupler) is damaged. Chances are your supply is of not enough capacity try to change it to something 5V 2A / 5V 4A

  • A better option is to power the relay with its own dedicated supply. You've got about 1.2A on pin#2/pin#4 which is not enough to energise more than about six 5V relays (and that's pushing it). – Dougie Dec 18 '18 at 20:46

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