Arduino Race Timer, Lap Counter, and Controller - Hackster.io
RC cars: IR 2.4GHZ multi client Lap timer for Arduino - General Discussion - Arduino Forum
Programming Arduino Timer 1 in Fast PWM mode | ee-diary
Lap timer for slot cars using Laser and Arduino - Gadgetronicx
Amazon.com: GANXIN Wired Laser Timer for Training,LED Stopwatch Race Clock,Racing Timer,Skating Track and Field Running for Sprints Bike Motorcycle (Middle,Plug-in The Power) : Sports & Outdoors
Laser Beam Timer | Jaycar Electronics
Slot cars arduino powered laser triggered lap time GLCD display. - YouTube
How to make a laser security system with Arduino -