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$3 Stepper Motor & Board — Parallax Forums

$3 Stepper Motor & Board

ercoerco Posts: 20,256
edited 2015-03-06 07:16 in General Discussion
Edit: Price dropped a buck from $4 to $3 in under a month, so I changed the thread's title. See post #21.

Another decent score from Ebay China. I won the auction for $4 (1 cent bid plus $3.99 shipping) at http://www.ebay.com/itm/180912529491?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1439.l2649

or you can "Buy It Now" from the same seller all day long for $5, free ship: http://www.ebay.com/itm/DC12V-4-phase-5-wire-Stepper-Motor-ULN2003-Stepper-Motor-Driver-Board-/180909399906?pt=LH_DefaultDomain_0&hash=item2a1f0a5f62

For comparison, another seller's price is $9.50 shipped:
http://www.ebay.com/itm/DC-12V-Gear-Stepper-Motor-28BYJ-48-12V-4-Phase-Reduction-Step-Motor-/251096435139?pt=LH_DefaultDomain_0&hash=item3a768389c3

I make about 2000 steps per output shaft revolution. The seller claims 64 steps per motor revolution and also 1:64 gear reduction, so something doesn't add up. Good torque, not terribly fast. Good holding torque when off. A tad more backlash than I'd like, but certainly worth experimenting for $4! I'll get another and build a diffdrive bot. Video & simple code follow.
' {$STAMP BS2}
' {$PBASIC 2.5}
'spins stepper motor about 180 degrees & back
'uses P0-P3 to ULN2003 controller board
'press BoE reset to cycle

DIRL=%00001111
B0=1
FOR W1=1 TO 250
OUTL=3
PAUSE B0
OUTL=6
PAUSE B0
OUTL=12
PAUSE B0
OUTL=9
PAUSE B0
NEXT
PAUSE 100
FOR W1=1 TO 250
OUTL=9
PAUSE B0
OUTL=12
PAUSE B0
OUTL=6
PAUSE B0
OUTL=3
PAUSE B0
NEXT
OUTL=0
END
«13456

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