Need help connecting arduino to a 5v relay

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....

  1. Is 4.85V coming out from the shield a fine number ?
  2. 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 ?

The relay is something like this..

https://encrypted-tbn0.gstatic.com/images?q=tbn:ANd9GcQGznxoiZezE9x3YgnwXAsSNM2VIw0AEehPTcg5QMckctdVFOYX1-nbdp4jD_qnCqJnjSs&usqp=CAU

Hello subroto
Post your sketch, well formated, with comments and in so called code tags "</>" and a none-Fritzing schematic to see how we can help.

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.

Sounds like you don't understand how to use a multimeter.

Why did you choose this forum section?

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 ?

This topic was automatically closed 180 days after the last reply. New replies are no longer allowed.