my stepper motor does not work!

Hi everyone,

I just bought my stepper motor, easydrive motor driver and 12V DC adapter. Because I am a rookie of arduino and stepper motor, I decide to test my motor according to the tutorial:
http://bildr.org/2011/06/easydriver/

However, after finishing wiring and uploading the code, nothing happens and my driver board becomes very hot! I hope that someone can help me. :disappointed_relieved: :disappointed_relieved:

here are the parts I bought.
12V DC motor: http://www.adafruit.com/products/798#Distributors
easydriver : http://www.amazon.com/gp/product/B004G4XR60/ref=oh_details_o01_s00_i00?ie=UTF8&psc=1
stepper motor: http://www.amazon.com/gp/product/B00C4P382G/ref=oh_details_o00_s00_i00?ie=UTF8&psc=1

The tutorial at bildr.org uses a stepper motor of 0.33A
You use a stepper motor of 1.3A. That is a lot more current.
Your power supply is 1A, and the EasyDriver can do a max of 750mA.
I don’t know if your steppermotor will run with 750mA.
Are you sure you have it wired correctly ?

I am sure that I wired correctly. So should I change the motor driver?

Are you sure you've connected the motor wires to the driver in the right order? Note that you should ensure you power off the driver before disconnecting the motor wires (you can blow the driver).

A stepper motor doesn't need full amperage to turn. You'll get less torque but still plenty to get it to move.

So my motor has 4 wires, red black blue and green. I connect black wire to A, green to A-bar, red to B, and blue to B-bar. Is that correct. I found this connection method online…

ycg1993:
So my motor has 4 wires, red black blue and green. I connect black wire to A, green to A-bar, red to B, and blue to B-bar. Is that correct. I found this connection method online...

That appears to be correct (according to random pages returned by Google) but it wouldn't hurt to verify conductivity between black and green and then between red and blue. Set your multimeter to test resistance and give it a doublecheck.

The chip has a thermal cutoff at 165C so it'll get pretty dang hot before it shuts itself off to protect itself.

Double check every connection, check all the supply voltages with a multimeter,
set the EasyDriver's current limit to the maximum 750mA setting and retry. Half
current ought to be plenty to get it to move without any load. I wouldn't trust a
1A supply to keep up with this load though, 1.5A or a higher voltage would be more
likely to hold up.

Try setting the current limit a bit lower to reduce the strain on the supply, try adding
some hefty decoupling on the EasyDriver supply (100uF or 1000uF or so electrolytic).

You haven't shown us exactly how its wired up so perhaps you should if you can't
get it working.

Remember that comment about not disconnecting the motor while the EasyDriver
is powered up - you'll almost certainly destroy the driver if you do this - did you
do this already?