Competition Shooting Timer made with Arduino
I am looking for help to make a Competitive Shooting Timer for IDPA competitions(international defensive pistol association). In my head it should use a piezo speaker as a microphone on a digital input, have a couple LED's for currently working and ready status, an LCD screen that shows the time lapsed since the first shot occurred to the hundredths of a second, and a push-button to stop the timer.
Any help would be greatly appreciated!!