Go Down

Topic: Controlling Nema 17 stepper with pololu A4988 (Read 1 time) previous topic - next topic


Aug 19, 2015, 10:34 pm Last Edit: Aug 19, 2015, 10:41 pm by Chrichri_Machine
Hi , :)
I have two steppers I need to test using  A4988 Stepper Motor Drivers and Arduino.


Nema 17 stepper motor :

200 steps per revolution (1.8 deg/step)
2 Phase bipolar 4 wires
Rated Voltage 2V DC
Rated Current 1.2A

Nema 17 stepper motor:

200 steps per revolution (1.8 deg/step)
2 Phase 4 wires
Rated Voltage 4.83V
Rated Current 0.84A

I have connected the motors countless times according to the diagram in the link below

My circuit is powered by a 9V battery, the direction and step pins are connected to pin 8 and 9 respectively, on the Arduino. I am using a UNO board and I am quite sure that the wiring is correct unless something really important isn't mentioned on the diagram. But no matter what demo code I run, the motor just vibrates and makes a scary noise but the shaft doesn't rotate  :( . I really can not identify my problem, need help  :smiley-confuse:


The small, rectangular 9V batteries are totally unsuitable for either the Arduino or motors.

Motors and the Arduino should always be  powered separately. You will also need a substantial power supply or a reasonably good sized battery supply to run motors. A 6-cell NiMH RC hobby pack would work for a while.

Carefully follow the instructions on the Pololu A4988 product page for wiring AND for setting the current limit.


the 9V battery only powers the motor through VMOT and GND on the driver and the arduino is powered via usb by the computer I think. As I said I am just in the testing phase of my project and this set up isn't permanent. Thanks for the battery suggestion though. I got the motors to rotate with a sample code  by reducing the delay a bit but it still makes an annoying sound. I'll try with a better PSU and see what's up. Thank you...

Go Up