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Chuckles

Member Since 09 Jun 2013
Offline Last Active Dec 04 2014 12:54 AM
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Posts I've Made

In Topic: Bezels for Cases?

27 March 2014 - 03:09 AM

Dave, yes, that is what I am looking for.


In Topic: Interrupts and Events Continue Firing

26 November 2013 - 02:37 AM

...bump...

 

Anyone?


In Topic: Interrupts and Events Continue Firing

22 November 2013 - 02:46 AM

I am still digging....

 

I saw this tutorial : http://bildr.org/201...ensors-arduino/ and it is leading me to believe that I can get this to work:

 

https://www.sparkfun.com/products/246

 

the same as this :

 

http://www.mouser.co...pb%2bGHLi3qmps=

 

Is that true? The track is running indoors in a US school gymnasium (lights are fluorescent and 15+ meters in the air) so I think there should be no IR interference.

 

All comments welcomed, I don't want to buy the wrong sensors twice!  :unsure:


In Topic: Interrupts and Events Continue Firing

18 November 2013 - 03:21 PM

Posted Image

 

 

 

For this kind of derby race, cars run on top of wood guides. My plan was to drill small holes in a section of the track (image shows pink dots where holes could go), place the sensors there, and detect the shadow of the car as it passes over the holes. The crowd watching the race does not have an obscured view of the finish line. Cars have strict requirements about weight and dimensions and add-ons, so they cannot have anything added to them like reflective tape.There is approximately 3mm between the bottom of the car and the wood guide, so my plan was to drill small holes in each slot, embed the sensor in the hole, and run wiring though the hole and under the bottom of the track.

 

I thought that a light sensor would fit these requirements the best, detect when a shadow is cast over a sensor and mark the time.

 

As you can see, I am now having trouble with the detection part....

 

If I went with https://www.sparkfun.com/products/246 , what other hardware would I need to go with it? The video at seems to indicate it can accurately/quickly detect the difference between light and shadow.

 

I am also looking through stuff at Mouser (http://www.mouser.co...nsistor&FS=True) to get more clue.

 

All newbie help is very much appreciated!

 

Thanks.


In Topic: Interrupts and Events Continue Firing

18 November 2013 - 02:53 AM

  Personally, I would use a photo-transistor instead, it is easier to use and it will work much better.  

 

Thanks for the detailed response. I have re-evaluated what I am trying to do... And now am shopping for "photo transistors". My typical part suppliers have been Adafruit and Sparkfun, neither of which appears to carry what you are talking about. Do you have a vendor recommendation?

 

 

Thanks!


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