How should I connect a 9 volt battery?

Forum 2005-2010 (read only) General Frequently-Asked Questions
1

I would like to connect a 9 volt battery to my Arduino, but I am not sure about one thing. Which wire do I connect to Vin, positive or negative? (I'm pretty sure it's positive)

2

Yes, positive battery terminal to Vin and negative goes to gnd. However battery life will not be be very good as recommended continuous load for a common 9vdc battery is around 10ma so depending on what loads you connect to the Arduino I/O pins the battery will discharge pretty quickly I suspect.

Lefty

3

Thanks! I'll keep all of that in mind.

4

Just wait for the other terms !!!!!

Normally it GND for ground or Negative and Vcc or Positive supply voltage.

Also Vdd and Vss which I had to use wikipedia to work out which was + - myself.