Arduino Forum

Products => The Arduino Starter Kit and Basic Kit => Topic started by: bugbiter on Feb 10, 2013, 07:44 pm

Title: Connecting 9V battery holder to male barrel jack
Post by: bugbiter on Feb 10, 2013, 07:44 pm
When I got my kit, the barrel connector was not soldered to the battery holder.  Initially, I ignored that since I was connected to my computer.  Now that I am building some projects, I need to use the battery.  I looked on the arduino board and on the connector but can not find anything to show me how to solder the barrel to the holder wires.
Please tell me  which is the negative and which is positive so I do not destroy the board on my first try.
Title: Re: Connecting 9V battery holder to male barrel jack
Post by: johnwasser on Feb 10, 2013, 11:31 pm
The center is +.  The barrel is -.

Don't worry about getting it backward.  There is a protection diode that keeps the current from flowing the other way.