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Hi, Solarbotics sells pager motors that use 1.3 Volts and 30mA. Could I run these motors off BX-24 without using an H-bridge? I would probably have to use a voltage divider or some other circuit to drop the 5V pins down to 1.3 Volts. Any comments? Sincerely, Burak Uzman

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>Hi, > >Solarbotics sells pager motors that use 1.3 Volts and 30mA. >Could I run these motors off BX-24 without using an H-bridge? >I would probably have to use a voltage divider or some other circuit >to drop the 5V pins down to 1.3 Volts. Any comments? I've run pager motors off the BX without an H=bridge, but I don't recommend it. Use a transistor, at least. the ones I used sucked down all the juice from the BX with no load, and the slightest resistance to their spin caused the BX to reset itself. -- -- Tom Igoe

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would it make sense to string 5 or 6 diodes in series to drop the voltage to a workable level? Brad Watts / AMT E-mail Web www.amt.nb.ca -----Original Message----- From: Tom Igoe [mailto:] Sent: Wednesday, February 28, 2001 2:53 PM To: Subject: Re: [BasicX] Driving Pager Motors with BX-24 >Hi, > >Solarbotics sells pager motors that use 1.3 Volts and 30mA. >Could I run these motors off BX-24 without using an H-bridge? >I would probably have to use a voltage divider or some other circuit >to drop the 5V pins down to 1.3 Volts. Any comments? I've run pager motors off the BX without an H=bridge, but I don't recommend it. Use a transistor, at least. the ones I used sucked down all the juice from the BX with no load, and the slightest resistance to their spin caused the BX to reset itself. -- -- Tom Igoe

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as long as it can supply the current you need for the motor, and doesn't need more than the BX can give to drive it, sure, why not? >How about using an opto-isolator? >Would that work. Indeed with the opto-isolator I can use a 1.5V >battery to run the motor. > >Thanks for your response. > >Sincerely, > >Burak Uzman > >--- In basicx@y..., Tom Igoe <tom.igoe@n...> wrote: >> >Hi, >> > >> >Solarbotics sells pager motors that use 1.3 Volts and 30mA. >> >Could I run these motors off BX-24 without using an H-bridge? >> >I would probably have to use a voltage divider or some other >circuit >> >to drop the 5V pins down to 1.3 Volts. Any comments? >> >> >> I've run pager motors off the BX without an H=bridge, but I don't >> recommend it. Use a transistor, at least. the ones I used sucked >> down all the juice from the BX with no load, and the slightest >> resistance to their spin caused the BX to reset itself. >> -- >> -- >> Tom Igoe -- -- Tom Igoe

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if you do something like this then run it not directly off the pins of the bx-24. run it from a opamp or an optoisolator instead. they are cheeper to replace if something does go wrong. --- wrote: > > Hi, > > Solarbotics sells pager motors that use 1.3 Volts and 30mA. > Could I run these motors off BX-24 without using an H-bridge? > I would probably have to use a voltage divider or some other circuit > to drop the 5V pins down to 1.3 Volts. Any comments? > > Sincerely, > > Burak Uzman > > > ===== Tony Brenke North Tacoma, WA __________________________________________________

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Burak, Most not a good idea. Those pins are not protected from the voltage spikes you get with DC motors. 30ma is really pushing an AVR output pin. Since you want to just drive them in one direction, I'd use a couple of transistors instead. The micro's outputs are strictly for non-inductive loads. DLC wrote: > > Hi, > > Solarbotics sells pager motors that use 1.3 Volts and 30mA. > Could I run these motors off BX-24 without using an H-bridge? > I would probably have to use a voltage divider or some other circuit > to drop the 5V pins down to 1.3 Volts. Any comments? > > Sincerely, > > Burak Uzman -- --------------------------------------------------------------------- * Dennis Clark Mechanical Engineering Behavior Based Robotics * * www.verinet.com/~dlc Colorado State University * ---------------------------------------------------------------------

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