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Author Topic: Testing to see if a shaft is turning  (Read 182 times)
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mc33033
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« on: April 01, 2011, 10:01:12 am »
 Bigger Bigger Smaller Smaller Reset Reset
Hi, I wonder if someone can offer a newbie some guidance here - I have a small DC motor connected to a shaft which has a black/white encoder disk and a simple IR emitter/detector - I want to use the signal from the IR pair to stop the motor if the shaft stops turning.  I've got the wiring sorted and have tried playing with the pulsein command and can see the signal but I can't think of the simplest way to link this to the motor kill?  Any help appreciated!
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AWOL
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I don't think you connected the grounds, Dave.
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« Reply #1 on: April 01, 2011, 10:03:36 am »
 Bigger Bigger Smaller Smaller Reset Reset
Just check a timer periodically, if you haven't seen a disk transition in the period, trigger the kill.
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Pete, it's a fool looks for logic in the chambers of the human heart.

robtillaart
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In theory there is no difference between theory and practice, however in practice there are many...
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« Reply #2 on: April 01, 2011, 10:12:36 am »
 Bigger Bigger Smaller Smaller Reset Reset
Measure the voltage applied to the motor (analogRead() - resistor divider etc) .

OK you are not sure it is turning but it should be smiley
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Rob Tillaart

Nederlandse sectie - http://arduino.cc/forum/index.php/board,77.0.html -

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