Arduino Timer

grabcad

Attached is the code from a project where I programmed a stopwatch. When switched from ground to 5V in the Arduino, the program outputs the length of time it was held at ground. I then calculated the percent error from the Arduino's clock frequency to real time and found that it was within 0.57% of accuracy. To try this program yourself, plug your Arduino in, make sure you have the Arduino software downloaded and paste the contents in this text file!