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Author Topic: Spindle speed  (Read 5446 times)

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Offline Hood

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Re: Spindle speed
« Reply #10 on: May 15, 2008, 06:43:52 PM »
Yes USB should be fine for the power. As for the resistor it will depend on your opto, the ones I use have a 10K pull up resistor built in.


Offline Kristin D

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Re: Spindle speed
« Reply #11 on: May 16, 2008, 04:15:01 PM »
The more I look at this the more confusing it gets, looking at the schematic for the HobbyCNC Pro board the input pins are all pulled high with a 10K SIP resistor pack, so it is looking more and more like I would not want to draw power from the PC supply and just pick off +5 from the controler board for the LED and wire the phototransistor from ground to input w/o any resistor or perhaps just a few hundred ohms for safety's sake. Last thing I want to do is fry the on-board port, I have a seperate card but It didn't seem to work last time I tried it, Have to check the address and settings again.