Timing system

I use Iridium Trackmate for timing

You need to have a suitable transponder to use the timing system

I made a gate for timing receiver units using a U-profile and 2 camera telescope with a special 3D-printable mounting part that I put also to Thingiverse.

The following is copied from trackmateracing.com:

”Software Features

  • Just click Start no complicated setup required
  • Sounds for Lap, Personnel best lap,  Overall best lap
  • Practice, Qualify, Race
  • Print results
  • View all Lap times
  • Enter Racers name only once with his transponder ID,  it will then automatically show racers name.

Theory of Operation

The Iridium System is a complete timing system for Radio Controlled Cars. The transponders use infrared technology, An overhead bar is placed at the start/finish line approximately 22 inches above the track with sensor modules placed every 14 inches. When a transponder passes underneath it will be detected and its ID will be sent to the PC. All 14 transponders can pass through simultaneously and all of them will be detected and counted.


The overhead sensor units are interconnected with the 14 inch cables supplied. Use as many sensor units as required for the width of your track. As few as one or thirty sensor units can be used. The orientation or which jack is used on the sensor unit does not matter. At either end of all the sensor units the 20 foot cable will be used to connect the sensors to the jack marked I on the interface board (the other 4 connectors are not used). The interface board is connected to the PC via serial cable supplied. The PC should have a serial port available which is a 9pin male connector. Some newer PCs do not have one so one must be installed or a USB to serial converter may be used.


Transponders are powered by the R/C receiver battery. You would normally plug into an unused servo channel.  It may be mounted in the windshield area or by having a clear area in the front hood of the car it would be possible to mount the transponder there.”