Powering an Arduino off of 12 Volt Car Battery
|5V car adapter charger for cell phones|
The setup was very simple. To do this you don't even have to remove the plastic outer case of the charger like I did. Just connect the end of the charger to the positive battery terminal and one of the side connectors to the negative side of the battery. Then just cut and strip the wire on the end of the charger. There is 5V output between the red and black wire (red being positive +, and black being negative -). There is also about one volt between the red and the white wire. I thought this was a bit odd because electronics don't usually use a positive wire as a common line.