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Old 05-08-2011, 04:41 PM   #13 (permalink)
ngrimm
EcoModding Lurker
 
Join Date: Apr 2009
Location: Oregon
Posts: 65
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First off I want to thank DCB and all involved in designing the MpGuino! Sorry for the delay but I just now finished testing my new circuit to work with the inductive sensor and it works great at all speeds down to 3 mph now and outputs a pretty clean square wave. I could go lower but I was worried about spurious noise giving false triggers. I am using one channel of an lm339 quad comparator from Radio Shack configured as a zero crossing detector. I was having some annoying problems at first but it turned out my breadboard had a problem so the chip wasn't getting ground One thing I am not sure of is whether to use a pcb mounted potentiometer on it to adjust the input threshold or just use a fixed resister. By adjusting the pot I think it would work fine even when using a 5 volt hall sensor. I'll go to Radio shack and pick up a small board to solder all the parts onto and take some pics. They should have everything needed to put it together. Thank you for your patience.
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JethroBodine (05-08-2011)