Remove all add-ons and measure the voltage on TP1-2. Should be 5v Then measure the voltage on 3v3 pin to ground, without drawing any current from it. I'm sorry if my original post was a bit unclear on this point. This is exactly what I have done and the voltage between TP1 and TP2 was 4.76V and the...

Just started to delve into the GPIO of my raspberry, and so started off with the extremely simple one-diode circuit running off the 3v3 pin on the raspberry. To my surprise it did not work, and so I started to look for errors. When using my multimeter the measured voltage across 3v3 and GND is only ...