I have a display in my car, and I was thinking I might as well hook an
infrared receiver to it and add a hot lap function. I bet they use a
38KHz carrier in most hot lap beacons, but does anyone know what
frequency they modulate it at?

For those of you who don't know what the heck I'm talking about, at
non-race track events people will quite often use things called "Hot Lap
Timers" which display their lap times inside the car. It's an infrared
system and requires a beacon at one point along the track. It trips the
IR receiver in the car and the timer shows you your lap times and has a
memory so after the "non-race" you can check each lap's timing. After
the trigger the timer suppresses retriggering for five or ten seconds.
It's not super accurate, and if you pass the beacon with a car blocking
you, too bad, but it's a system that is better than nothing.

Thanks,

Bob

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