My stepper motor turn just in one direction

Other Hardware Motors, Mechanics, Power and CNC
1

Hi, I have a problem with my stepper motor 17HS4401, I connected it with DVR8825( driver)

I set vref to 1.2v and i upload this code

/* stepper motor control code for DRV8825
 * 
 */

 // define pin used
 const int stepPin = 9;
 const int dirPin = 8;
 
 void setup() {
 // set the two pins as outputs
  pinMode(stepPin,OUTPUT);
  pinMode(dirPin,OUTPUT);

}

void loop() {
digitalWrite(dirPin,HIGH); //Enables the motor to move in a perticular direction
// for one full rotation required 200 pulses
for(int x = 0; x < 200; x++){
  digitalWrite(stepPin,HIGH);
  delayMicroseconds(500);
  digitalWrite(stepPin,LOW);
  delayMicroseconds(500);
}
delay(1000); // delay for one second


digitalWrite(dirPin,HIGH); //Enables the motor to move in a opposite direction
// for three full rotation required 600 pulses
for(int x = 0; x < 600; x++){
  digitalWrite(stepPin,HIGH);
  delayMicroseconds(500);
  digitalWrite(stepPin,LOW);
  delayMicroseconds(500);
}
delay(1000); // delay for one second
}

The motor should turn in the two directions, but it turns just in one direction.

2

Hi,
You are setting the direction pin HIGH in both cases... One case needs to be LOW I think..

3

Thanks the motor works fine, but I have 2 more questions please :
1- When the motor stops turning i hear a whistle, is there any method to reduce this sound?
2- Can the wires in the motor connector drive 2 amps? because i think they are very weak.

1000×1000 87 KB

4

If the wires came with the motor I would expect them to be OK. You don't need much copper to carry 2 amps unless the distance is very long.

2 amps is probably a bit too much for a DRV8825 unless you have a heat sink and an cooling fan. It is not a good idea to operate electronic equipment close to the limit of its capacity.

Post a link to the datasheet for your motor.

...R

5

Robin2:
If the wires came with the motor I would expect them to be OK. You don't need much copper to carry 2 amps unless the distance is very long.

2 amps is probably a bit too much for a DRV8825 unless you have a heat sink and an cooling fan. It is not a good idea to operate electronic equipment close to the limit of its capacity.

Post a link to the datasheet for your motor.

...R

550×743 70.8 KB

I followed the same instructions this website Pololu - DRV8825 Stepper Motor Driver Carrier, High Current.
My motor (17HS4401) have 1.7A as rated current and I use full step setting so the measured current will be 0.7 times (70%) the current limit :

current limit = 1.7A / 0.7 = 2.43A
Vref = current limite / 2 ==> 2.43/2 2.43 = 1.21V
what do you think ?

6

I reckon the DRV8825 should be OK with a 1.7 amp motor.

...R