The snap switch is mounted to the track's starting gate and is wired to the timer to signal when the race is started.

Note: Only one (1) switch is needed for the timer.

The Pinewood Derby Timer (PDT) is an Arduino based timer with a robust and flexible design which allows it to be easily constructed and modified to meet your specific needs. Features of the race timer include:

• Easily expandable from 1 to 6 lanes
• Supports (optional) digital displays for each lane to show finish time and/or place order
• Supports (optional) solenoid start gate circuit
• Supports lane masking, start gate status check, resend race results, force end of race
• Works standalone or can be interfaced to race management software running on an attached computer

Adafruit Micro Switch w/ Roller Lever - Three Terminal (ID# 819).

I will do my best to get items shipped as quickly as possible but please allow 1-2 days.