|Jun 16, 2004, 06:58 PM|
Using IR emitter and IR rx to count laps
We slope race and guys have to move flags so we know when the planes pass a point.
Wouldn't the parts be cheap to power off your BEC using a resistor to power the IR LED aimed off one side of the wing.
On the hill you have an IR receiver that counts the laps.
It would have to add a lap then wait a few seconds before adding another lap if it still sees the IR so the plane can get away.
Making it work for more than one plane may be impossible?
|Jun 17, 2004, 03:49 PM|
I/R does not work well in the light of day. Sunlight blinds it. The TSOPxx claims a range of 35 meters, but that’s in a dark room. Outside, in daylight, you’d be lucky to get 10 feet horizontal and if the receiver was looking up into the sky I doubt it would work at all.
If you can get around that (fly only at night) try using multiple I/R decoders in your receiver station that have built in demodulators for different frequencies. The Vishay TSOP48xx line comes in 7 different frequencies from 30KHz to 56KHz. (Your TV probably uses a 38KHz receiver.)
Then each plane modulates their LED at a specific frequency.
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