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mezsgcxeaTARİX: CÜMƏ, 2014-11-07, 12:07 PM | Message # 1
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in reverse when exposed to IR, it produces voltage. I would have liked to attach an interrupt to this setup but did not realize what was necessary, so in this case, the loop() is fast enough to detect a ball moving fairly quickly.

the video below shows the prototype circuit in action.

Also I have attached an image showing the emitter/detector setup, the pins connected to the teensyduino and the arduino code I used to test the setup.

An improvement would have been to get some phototransistors. These would have allowed me to use interrupts in the code which may have made detecting the balls faster but overall the results are good.

I used crossdowels and machine screws to join the plywood pieces together for the motor mount mostly.

To to this involves drilling a hole through the face of the plywood. The hole needs to be large enough for the crossdowel to fit into and far enough from the edge of the wood that the wood will not be weakened. I leave a space at least the thickness of the plywood for strength.

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Probably I am making this overly complicated but I think this is a very strong and simple way to join plywood together.

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It can be difficult to figure out what coat or jacket to wear when the weather is a bit hit and miss; you don't want to be too warm but you don't want to get soaked either. That's why it's always a good idea to have certain coats and jackets in your wardrobe. A simple waterproof mac is certainly <a href=http://www.ventepriveeugg.fr>vente de ugg pas cher</a> handy and can even be popped into your bag, while a lightweight fleecy jacket can be worn underneath for extra warmth if needed. For something more fashionable a leather jacket will work well, but you'll need to carry an umbrella with you because most don't have hoods.

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