Drive dual coil steppers without H Bridge

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hey,

i came across dual coil stepper based instruments out of car want use display stuff on arduino. coil impedance 200 ohms. can't afford h bridge or motor drive shield, though they're 5 bucks. (don't ask.)

i want other ways drive these small instruments. if understood right make pointer move have drive coils in reverse polarity, 1 powered + / - , other - / + , reverse make go other way. assumption correct? driving both @ same time should take 5 volts / 100 ohms = 0.05amps.

so yeah, i'm pretty looking easy makeshift way make use of gauges. got loglevel mosfets (irl540n, know, overkill, might work) lying around suitable. yeah can't wrap head around yet, advice great.

thanks :)

sooner or later i'll drive shield it's improvising , learning time.

by way, if pwm output pin 0/off, pulled gnd? , if not, if used resistor pull gnd maybe reverse polarity thing somehow?

5v , 200ohms per winding(*) _is_ within capabilities of arduino pins drive - you
will need protection diodes bolster on-chip ones (preferrably schottky diodes).

so bipolar motor need 4 pins, each protection diode ground , vcc, and
then question of software.  in effect each pair of pins h-bridge.

(*)  5v / 200 = 25ma, whereas pin absolute maximum 40ma.  lose voltage,
perhaps you'll 4v drive between 2 pins due losses in output
transistors.


Arduino Forum > Using Arduino > Motors, Mechanics, and Power (Moderator: fabioc84) > Drive dual coil steppers without H Bridge


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