John.R wrote:There is continuity across all the 5v pins and I know the power source is fine because I have used it with the GPS breakout board successfully. None of the ground pins have continuity to any of the other ground pins though, which I find odd, and may may be part of the problem,
Yeah, lack of continuity between the ground pins is a problem, and a very strong candidate for being *the* problem. If one of your supply wires is isolated from the rest of the circuit, nothing will work.
John.R wrote:but I know it isn't the solder points.
That's a statement I'd never make about my own joints, and I'm pretty good with an iron. Every once in a while a cold joint looks perfectly normal. The first rule of debugging is "if you haven't measured it, it isn't true."
Let's do a quick sanity check on the supply rails:
First, measure the voltage between the 5v0 and GND pins on your Pi Cobbler (to the left in the picture). I fully expect you'll see 5v, but we have to tick that item off as having been measured before we look at the connections further downstream.
Second, disconnect the red and black jumpers from the RFID breakout and confirm that you're indeed getting 5v through the wires. There are any number of ways for a jumper connection to fail, especially when you're working with a breadboard.
Once you've confirmed a 5v potential across the female ends of the jumpers, connect the GND jumper to another GND pin on the breakout and the 5v jumper to one of the pins labeled 5v0. Take a voltage reading across the short ends of the pins sticking out the other side of the PCB. The goal is to verify that a 5v supply is indeed reaching the pads on the breakout.
Do that for all the 5v0 pins, then move the GND jumper to another GND pin on the breakout, and run the series of 5v connections again. The goal is to show that the board doesn't work for any possible combination of supply connections (I think there are nine permutations) with the supply voltage confirmed at the pads. If that process 'fails', it means you'll have gotten the board to work. If the board doesn't work for any combination of supply connections, it's a clunker and we definitely owe you a new one.. and probably need to double-check the test harness/process for those boards.
When you void a product warranty, you give up your right to sue the manufacturer if something goes wrong and accept full responsibility for whatever happens next. And then you truly own the product.