Hi,
I want to power my arduino and an opto relay board (4) from the wall.
I've got a couple of chargers that are strong enough and take a USB plug
But would need a suitable cable/plug.Any suggestions?
Thank you,
John.
The Arduino needs about 5-9 volts of DC power at about 50mA with a large safety factor you should be able to find a wall wart that supplies a minimum of 500mA depending on your opto boards. But since I do not see any schematics it's hard to tell. you can just as easily attach a male barrel jack onto the wall wart and use that to provide power.