Hi, long time no post!
Ok so I have not messed around with my Arduino Duemilanove for a while now since I have been busy, however tonight I dusted it of and have started on a simply task. But I am a little stuck already! :)
Ok so the idea is that I have a potentiometer attached to my Arduino which has a value that ranges from 0-1023 and the value that it is on determines whether a red, yellow or green LED is lit. Ok so I am ok with the coding and so far have got to the point where the first LED is lit when the value is between 0-160. My problem is that the LED is very dull and so I want to add more power using a 3v power pack. However I do not know how to attach it. I have tried it in a few locations but the first caused the LED to stay constantly lit, the second lit all three LED's and the third caused the all the LED's to light up but the brighness changed depending on the potentiometers position??? Any help would be great! :)