I'm back for another awful newbie question. Thanks in advance for your patience.
I'm going to build my own arduino on a breadboard for an existing pure arduino project. My arduino sketch controls a motor and fan with an external 12v power supply and 2 transistors. Other sensors plug into the breadboard and then the arduino, which is powered by a 5v usb wall wart. I'm trying to combine everything.
Early on, when i knew even less than I do now, I tried to run everything with with the 12v into the vin jack. I fried an atmega that way. So I'm scared of all things power.
Is there a way to have one wall wart to send 5v to arduino and pins and 12v to motor and fan?