HobbyKing.com New Products Flash Sale
Thread Tools
Old Jun 16, 2004, 07:58 PM
Registered User
sloper steve's Avatar
America the ruling country
Joined Dec 2003
3,204 Posts
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?

Any ideas?
sloper steve is offline Find More Posts by sloper steve
Reply With Quote
Sign up now
to remove ads between posts
Old Jun 17, 2004, 04:49 PM
Registered User
Happy Hobit's Avatar
South of Detroit
Joined Sep 2002
206 Posts
Hi Steve,

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.

Happy Hobit is offline Find More Posts by Happy Hobit
Reply With Quote

Thread Tools

Similar Threads
Category Thread Thread Starter Forum Replies Last Post
Discussion HS-65 Servos Issues with Heli Cyclic using Spektrum DX6 Transmitter/ RX JohnM Hitec/Multiplex USA 8 Nov 16, 2006 09:13 PM
Help! IR Emitter / Detector Noto DIY Electronics 13 Aug 15, 2006 06:22 PM
Using 40MHz GWS 4ch rx's with 36MHz PLD DIY Electronics 6 Jan 23, 2005 08:11 AM
WTB: Z tron IR TX and RX plus actuators Matthew Cotten Aircraft - Electric - Airplanes (FS/W) 0 Apr 29, 2004 12:18 AM
Looking for IR Tx & Rx kit or already built. infrared Scratchbuilt Indoor and Micro Models 2 Apr 18, 2004 01:11 PM