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Topic: Step motor DC 4-9V/500mA stucks (Read 667 times) previous topic - next topic


Hello everyone

I´m trying to run a step motor with my Arduino Mega and EasyDriver V44 A3967.
I did my best but I can´t make it turn.
Can you guys please give me hand ?

Motor specs:

2 phases
4 wires
step angle 18 degrees
Driving Voltage: DC 4-9V/500mA

to test it and identify the coils I measured the resistency among the wires and it´s 20 Ohm.
I also plugged a Led and when I turn the shaft by hand it blinks.
so I assume the motor is working.

To drive it Im using V44 A3967 (Easy Driver).

to power the motor I´m using 4 AA 1.5 v batteries.
Total 6 v connected to EasyDriver power in and the Easydriver red led turns on.

When I run my code the motor does like one step and gets suck.
If I unplug the motor I can turn the shaft by hand but once it connected in my driver running the code I can´t turn the shaft.

Is my 6v enough to power this motor ?

Here is my simple code:

// Easy driver pins declaration

int pin_step =3;   
int pin_dir =2;

int steps_motor =20;   //I assume 20 steps for one revolution 360/ 18deg because motor step angle=18   

void setup()
  // Define pins as output
  pinMode(pin_step, OUTPUT);
  pinMode(pin_dir, OUTPUT);

  digitalWrite(pin_step, LOW);
  digitalWrite(pin_dir, HIGH);   //define direction

void loop()
  for (int p=0 ; p < steps_motor; p++)
   digitalWrite(pin_step, HIGH);
   delay (5);
   digitalWrite(pin_step, LOW);
   delay (5);

Here is the motor link:


Thanks in advance
Rio de Janeiro, Brazil


Is my 6v enough to power this motor ?
Yes. The current that the 4 batteries output may be nowhere near enough, though. In general, stepper motors are not powered by batteries.

The art of getting good answers lies in asking good questions.


Steppers don't have a voltage rating, so that's a 0.5A stepper of unknown winding resistance.  Perhaps
you should measure the winding resistance.  Then we can figure out the minimum usable supply voltage.
[ I will NOT respond to personal messages, I WILL delete them, use the forum please ]

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