Rotor-Racing I-Laps sensor bar

**UPDATE July 4, 2017**: Added STLs for 40mm pipe

[Rotor-Racing](http://rotor-racing.com/) has been using the [I-Laps](http://www.rclapcounter.com/) infra-red (IR) timing system ever since we began running drone races. The system uses 3 or more IR sensors mounted on or near the start/finish gate to detect the unique ID that is transmitted from an IR transponder mounted on each drone.

This sensor bar uses cheap, readily available PVC tubing to create a sensor array that compensates for dro