Hi everyone, I was hoping I could have some help as I very stuck. So I had my project working on a solderless breadboard, and the circuit was just controlling a mini 12v air pump with an atmega328p.
However I have just soldered everything to a permanent board and now when I plug it nothing works and makes my plug make a hissing noise, and the LED from the plug turns off (when it is normally on all the time it is plugged in).
Below I have attached the schematic for the circuit.
You have probably did this already, but make sure you have triple checked the wiring, I have from time to time put a wire or something in the wrong place on the soldered version, have also missed soldering a connection sometimes.
Do you still have the breadboard you can check against? I always keep the prototype set-up until the soldered version is running.