1 - Digikey, Switch Snap Action SPDT (CKN1422-ND).3 - Digikey, 133 Ohm Resistors (RNF14FTD133R-ND).3* - Digikey, 270 Ohm Resistors (CF14JT270RTR-ND).1 - Sparkfun, Arduino Uno - R3 (DEV-11021).The parts below are shown with a supplier and quantify for three tracks/ If more tracks are desired, the Arduino Mega has more pins and can be used with everything else as is. This instructable shows an Arduino configured for three tracks, but can be extended to more four tracks easily.

Oh, and most importantly, a Pinewood derby track. Also, you will need some small screws to attach the gantry and start switch. And several length of 22 gauge wire (can be salvaged from telephone wire). a 9 VDC wall wart or an USB plug and cable. In addition to the required components below, You will need a soldering iron, and electronic solder. It displays the results by blinking white LEDS in a pattern over each lane. When a car crosses the finish line, it breaks the beam and the Arduino records the event. In the lane center piece (which is used as a guide for the cars), the detector, which has been mounted in a tube, is glued into a hole. The Instructable does NOT cover construction on the track.Ī gantry over the finish line holds one IR LED for each lane. The same software can work with an Arduino Mega and with that model, you could have more lanes than you can deal with.

This example is for three tracks as long as you have two pins available for each additional lane, you can add lanes. As various tracks differ greatly, it concentrates on the software and basic interface. There are commercial devices that are more richly featured, but this Instructable is for a Cub Pack that may not have the funds for a premium solution. This Instructable describes a simple race timer based on an Arduino Uno. The popularity of this event amongst youth has led to the development of a small industry supplying various and necessary components, such as race timers. There is an official kit, with standard wood block (that can be modified according to the Scout’s vision), and plastic wheels with metal axles. Cub Scouts and their parents, build their own cars from wood. The Pinewood Derby is a racing competition. Part of many a boy’s youth is a Pinewood Derby.

Download finish line flags