I've just nicked the 4 digit 7 segment display from my alarm clock and now i need your help.
All the LEDs share a common +ve lead. (common anode or cathode???)
Now here are my questions.
1) Can I wire it so the +ve to say plus 3V and then all the -ve to the Digital Pins?
2) If so, my code would be the opposite right? eg for the blink sketch to get one of the lights to turn on it's be digital output LOW, and then off would be HIGH.
3) Can the arduino do this? Bad for it?