IR Lap Timer

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JimEli
Posts: 30
Joined: Sat Jan 24, 2009 3:28 pm
Location: USA

Re: IR Lap Timer

Post by JimEli » Fri Jun 04, 2010 9:19 am

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Last edited by JimEli on Thu Jan 13, 2011 7:34 pm, edited 1 time in total.
If it can't be fixed with a hammer, it must be an electical problem.

djk
Posts: 2
Joined: Mon Jul 19, 2010 6:37 pm

Re: IR Lap Timer

Post by djk » Mon Jul 19, 2010 6:44 pm

Do you know what frequency the AIM beacon modulates at? I believe the carrier is 38KHz but it is a pulsed signal at a lower frequency? I have seen this to be ~5mS with other beacons...just wondering if you are detecting this pulse to validate the signal or just an "edge"...i'm worried direct sunlight would give a false trigger.

Do you have issues with direct sunlight and your PNA4602M or is that what the tic-tac box is for?

I'm going to try a pre-wired TV IR receiver that has a tinted lens and i'll post how this works.

I'd love to hear how your transmitter is coming along.
Thanks!

JimEli
Posts: 30
Joined: Sat Jan 24, 2009 3:28 pm
Location: USA

Re: IR Lap Timer

Post by JimEli » Thu Jul 22, 2010 9:40 am

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Last edited by JimEli on Thu Jan 13, 2011 7:35 pm, edited 2 times in total.
If it can't be fixed with a hammer, it must be an electical problem.

bbq
Posts: 4
Joined: Wed Dec 30, 2009 11:51 am

Re: IR Lap Timer

Post by bbq » Sun Jul 25, 2010 7:40 am

Hi Jim,

I just bought a racecar fitted with an AIM Laptrigger. So - no money left, need to build my own beacon :D

I just took the sequence you measured and hacked into an arduino. Despite just having a red LED for testing, it worked in a dry run. It should be noted that the PNA4602M inverts the signal, i.e. you need to send IR-pulses during the periods you measured as low.
Need to buy some IR-leds and test it on the track though. Thanks anyway for sharing the info!

Cheers,
Andy

JimEli
Posts: 30
Joined: Sat Jan 24, 2009 3:28 pm
Location: USA

Re: IR Lap Timer

Post by JimEli » Mon Jul 26, 2010 7:45 am

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Last edited by JimEli on Thu Jan 13, 2011 7:36 pm, edited 1 time in total.
If it can't be fixed with a hammer, it must be an electical problem.

bbq
Posts: 4
Joined: Wed Dec 30, 2009 11:51 am

Re: IR Lap Timer

Post by bbq » Mon Jul 26, 2010 9:51 am

I ordered some Osram 4546 LEDs with about the same specs as yours, 20° beamwidth. I decided not to take a too narrow beam because the code sequence takes about 10ms and i'm not sure if the AIM triggers on partial codes as well. I'll plug in a ULN2803 as a driver and aim for 4 LEDs with 1A current each.

Should work, we'll see :D

JimEli
Posts: 30
Joined: Sat Jan 24, 2009 3:28 pm
Location: USA

Re: IR Lap Timer

Post by JimEli » Mon Jul 26, 2010 10:03 am

...
Last edited by JimEli on Thu Jan 13, 2011 7:35 pm, edited 1 time in total.
If it can't be fixed with a hammer, it must be an electical problem.

bbq
Posts: 4
Joined: Wed Dec 30, 2009 11:51 am

Re: IR Lap Timer

Post by bbq » Mon Aug 09, 2010 7:03 am

Been on the track yesterday and tried my transmitter. It worked well initially, however rain and an uncharged car battery prevented a longer use.
Anyway, the Arduino with the ULN2803 driver circuit and 4 Osram 4546 LEDs performs very well. Total current consumption is about 150mA, each LED roughly 1A pulse current. I'm going to get a Li-Ion battery and build it into a nice box now.
Sourcecode for Arduino (Mega328, AVRStudio+WinAVR) on request.

0blacklist
Posts: 1
Joined: Mon Aug 23, 2010 10:44 pm
Contact:

Re: IR Lap Timer

Post by 0blacklist » Mon Aug 23, 2010 10:49 pm

Hi,

thanks for sharing your project.

Btw, what is an "AIM IR transmitter beacon".


http://www.creativenexusonline.com

JimEli
Posts: 30
Joined: Sat Jan 24, 2009 3:28 pm
Location: USA

Re: IR Lap Timer

Post by JimEli » Tue Aug 24, 2010 6:47 am

...
Last edited by JimEli on Thu Jan 13, 2011 7:35 pm, edited 1 time in total.
If it can't be fixed with a hammer, it must be an electical problem.

MA$TER_E
Posts: 18
Joined: Thu Dec 02, 2010 11:15 am

Re: IR Lap Timer

Post by MA$TER_E » Thu Dec 16, 2010 5:40 pm

Hi JimEli!

I did my first track day in September and I'm hooked. (sportbikes) I've got a list of things to buy one of them being a lap timer. Long story longer I started getting into this Arduino business and am making a gyro cam type of system to mount on the tail of my bike (as I lean the camera counters). And finally getting to the point I started thinking HEY! Why don't I make a lap timer? So here I am…

I was going to buy an XT Ultra-Lap Lap Timer with both the transmitter and download module which is going to run you around $300 bucks for the whole setup… Although their system is very refined and sophisticated I think I could get what I need better and cheaper using an Arduino.

The plan is to make a system very similar to yours except I'd like to add an SD card data logger so I can pull the txt files over to my laptop at the end of the day and import them into my own little analytical software. But in the future I'd like to look into what will be involved feeding in a whole bunch of sensor data for a full scale custom data accusation system (throttle position, RPM's, gear number, break pressure, tire temps and maybe even tire pressures)

Anyway, the thread has been inactive for a while and I wanted to see if there was any further development or discoveries made. How has it been working for you so far? Is it still working for you pretty good? How are the batteries holding up?

Eric

Build a man a fire and he's warm for a night...
Set a man on fire and he's warm for the rest of his life...

jrfoell
Posts: 1
Joined: Mon Jun 08, 2015 8:38 pm

Re: IR Lap Timer

Post by jrfoell » Mon Jun 08, 2015 8:42 pm

bbq wrote:Been on the track yesterday and tried my transmitter. It worked well initially, however rain and an uncharged car battery prevented a longer use.
Anyway, the Arduino with the ULN2803 driver circuit and 4 Osram 4546 LEDs performs very well. Total current consumption is about 150mA, each LED roughly 1A pulse current. I'm going to get a Li-Ion battery and build it into a nice box now.
Sourcecode for Arduino (Mega328, AVRStudio+WinAVR) on request.
BBQ, I know this is a long-shot with this thread being so old, but I'm interested in the source code (and schematic) for your IR beacon. I have an XT Ultra Lap and I'd like to build a beacon for it. Thanks!

JimEli
Posts: 30
Joined: Sat Jan 24, 2009 3:28 pm
Location: USA

Re: IR Lap Timer

Post by JimEli » Tue Jun 09, 2015 10:10 am

If it can't be fixed with a hammer, it must be an electical problem.

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