7-Segment Display: $13 Arduino Protoshield ... but you're looking for when the display is the most magnified without being blurry. I found this the easiest way to do it: Look through the combiner ...

This is a simple 0 to 9 counter circuit constructed using Arduino! Here, a common cathode 7-segment LED display is connected to Arduino for displaying the digits. The code (Arduino sketch) allows push ...