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Can some one Help me?`

post #1 of 10
Thread Starter 
im a RC car racer and I want to build this "transponder" but idk how i would go about it.

the transponder counts laps pretty much. some thing like this click here

The one on the link is about 100 dollars and thats alot of money. i think it can be done with about 20 to 30 dollars tops but idk how to code it. can any one help??

thanks in advance


also found this on this website. of how the code would work like? Here its on the second response
Edited by SergioSandoval - 6/7/11 at 11:25pm
post #2 of 10
Thread Starter 
any one??
post #3 of 10
Dont bump your thread so quickly. Wait for someone to respond before posting again. You can always use the edit feature of your post to change it to your liking if you made an error.
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Caseless Wonder
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post #4 of 10
I think you would have a very hard time recreating that,especially for $100.Looks like it does alot more than just count laps,i.e. like sending coded info to the timing system,which is all I'm sure pretty unique to RC racing.
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post #5 of 10
Thread Starter 
Quote:
Originally Posted by Redwoodz View Post
I think you would have a very hard time recreating that,especially for $100.Looks like it does alot more than just count laps,i.e. like sending coded info to the timing system,which is all I'm sure pretty unique to RC racing.
well see its this exact thing im just looking for that little part he moves over the cords. he made a home made one.
post #6 of 10
That part looks somewhat simple to make since it looks to be infrared. The only issue is that you would have to know what data, and the type of IR communication its using. Most companies do not give this information out so you are locked into their products.

If you are completely building your own, its fairly simple thing to do. Get 2x arduinos (a mini one for the car), have the Car constantly broadcast its ID number, voltage, and whatever else you want over a IR transmitter. Then on the finish line, you have the other one hooked up to a photo-diode with a pipe over it to make sure it can only see the car when it crosses the line. It then sends the car ID and timestamp to a computer.

This would be a non-trivial amount of work to make.
post #7 of 10
Thread Starter 
Quote:
Originally Posted by ShamrockMan View Post
That part looks somewhat simple to make since it looks to be infrared. The only issue is that you would have to know what data, and the type of IR communication its using. Most companies do not give this information out so you are locked into their products.

If you are completely building your own, its fairly simple thing to do. Get 2x arduinos (a mini one for the car), have the Car constantly broadcast its ID number, voltage, and whatever else you want over a IR transmitter. Then on the finish line, you have the other one hooked up to a photo-diode with a pipe over it to make sure it can only see the car when it crosses the line. It then sends the car ID and timestamp to a computer.

This would be a non-trivial amount of work to make.
I saw this other video where the guy used a tv controller to set of the actual lap counter so I'm thinking that the IR is as simple as a tv controller. I know that the transponder has to have a 10 digit number that sends it to the computer every time I hass the finish line at the track. The track already has a lap counter built in. Also what about power source? Thanks a lot manb!
post #8 of 10
Power you would get from a battery or the wall for the track-side part, your RC car probably already has one for the RC receiver.
post #9 of 10
Thread Starter 
Quote:
Originally Posted by ShamrockMan View Post
Power you would get from a battery or the wall for the track-side part, your RC car probably already has one for the RC receiver.
ok. but how would YOU diagram this?
post #10 of 10
Here you go man, I've used these personally with great results!

Hobbico Microsizers Digital Lap Counter $19.99
Radio Shack Laser Module (Pointer) (P/N 277-1101) $4.99
Radio Shack Photo transistor/Detector $3.29
K&S Aluminum Tube 9/16" $2.00
Telephone or Network Cable



Basic concept:
http://mini-zracer.com/forums/showthread.php?t=19389

Improved concept:
http://mini-zracer.com/forums/showthread.php?t=20805
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