Hi ... I need some help here. So I'm connecting my arduino with ethernet shield to a 5v 8 channel relay. The 5V goes to the VCC on the relay and the GND goes to the GND on the relay. I measure the voltage coming out of the shield at 4.85V... But when I measure it on the relay pins... it's -2.5V ... My relay does not work.
So....
Is 4.85V coming out from the shield a fine number ?
The elephant in the room... So I measure the voltage on the relay because it does not work all of sudden. The voltage measures at -2.5V and coming out 4.85V from the shield, I think it should've been 4.85V as well right ? Could this mean the relay is broken ?
Unless you have a seperate power supply you havent told us about you can not get a negative voltage.
So we need a proper, FULL schematic showing all sources of power.
because of the LED on the relays. And the note below the subforum "Controlling lots of inputs and outputs"... which is why I use a relay. I figure someone who works with LED may know one or two about relays. But thanks anyways, the problem is solved, it's because i'm using low quality M to F jumper wires they're easily bent/burnt after plugging and unplugging.
What subforum is more appropriate for this kind of question ?