I very recently bought an Arduino Uno to brush up my rusty electronics skills, and am starting out with a relatively simple timer project.
I've successfully wired up a common anode 4digit 7segment display to my Arduino and have got it scrolling text, but I've noted that around the web a lot of people are connecting/switching their anodes with transistors. I understand this is to prevent too much current draw on the pins of the Arduino. In my case the draw per segment is only 20mA (and I have resistors on each segment), so as long as I'm only turning one digit on at a time, I shouldn't have a problem?
As I say, my skills are a little rusty, so just need some advice before I'm confident enough to move on with the project. Regards Tom