OK well moving on, I think the white wire on the ribbon cable is supposed to be pin 01, which is on the bottom right in this pucture. Most diagrams have the Pi the other way around, with the USB/eth ports facing down

And the trace that goes to pin 01 goes to the 3.3v pin on the rfid reader, so it’s pretty easy to find

You can’t see it in this picture but there is a notch in the socket which determines which way the ribbon cable plugs in, I am just trying to make sure I don’t put it on backwards

Anyway I think the pin with the square pad is pin 01, which would make sense. Also kicad appears to know that it's mounted on the other side of the board

Here’s a 120Ω resistor with that blue LED, looks a little brighter

please don't look too closely at the solder joints, they are bad

@twistylittlepassages I mean, if that’s the worst mistake I have made on this board I will be thrilled

@LovesTha well that’s a relief, I’ll just order more boards now then

@CarlCravens oh totally, there are even kicad footprints for vertical placement. I just was hoping for something flatter

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