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JimEli wrote:What's really entertaining is to watch 10 people setup their AIM beacons / transmitters next to each other on the track. Everyone's timers trigger off the first beacon and ignore the rest...mcuaust wrote:Hi,For the timer to work, an IR Transmitter Beacon is required to define the start/finish line. There are several commercially made systems that utilize beacons, such as AIM, Hotlap, Traqmate, etc. Most of these beacons are encoded so the timing and associated data acquisition systems can distinguish between each other. My timer piggybacks off the AIM beacon.
thanks for sharing your project.
Btw, what is an "AIM IR transmitter beacon".
JimEli wrote:I am happy to report version 2.0 works great.Thanks for keeping us updated, the schematic link does not work though. I am sure what you mean by "express-pcb" boards, are these just etched boards ready for populating with the components? If so I would likely be interested depending on the cost of the other required parts.
It's a simple IR reciever/interface module that activates an external chronograph (I used a DRC SP1 motocross lap timer--google it).
The module involves a pna4602M IR detector, AVR ATtiny85 and associated circuitry for power (9v battery).
Accuracy was within a 100th of a second as compared to the AMB track timing equipment. The SP1 has lap memory capability and costs about $50.
Details can be found here:
aTtiny85 code using arduino timing code
I have 8 express-pcb boards for the project if anyone is interested.
JimEli wrote:sorry, the link works now.Ok yep the schematic works now. I think I have most of the parts kicking around except the AVR and IR detector. I have a couple questions about the schematic though. What are CV, CG, IS, IV and IG. I am assuming they are inputs and outputs for the IR Detector and timing device.
Yes, I made a batch of pcb, and have bare boards left over. I think the parts could be sourced for under $10. Add for an enclosure, wiring, bells-whistles, etc. You would need an AVR programmer too, and that would allow you to modify the code to suit your whims.
Contact me offline if interested in a pcb.
I still intend to add more timer codes too...
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