Bipolar Stepper Troubleshooting need help.....

Hello people! I'm about to complete a project -cnc plotter- using bipolar stepper motors. The motors are coming from old dvd/cd-drivers and connected to l293d and arduino.

I tested every motor in separate by using a simple program that turns the motor 25 steps forward and 25 steps backward and no problem appeared..! But when i assembly the project, i have the following problems:

i) The motors seems to have no power to be moved, although i have Vcc2 of the l293d on 12v and so, that gives 10.4v
ii) Motor is taking wrong direction. OR after doing the forward loop, doesn't returns to the backward one but continues with another forward loop.
iii) Sometimes the motor stay in the same position and is moving only one step forward/backward.

You can see in the video what i am talking about



And this is the software (found it on the net):

int nero = 9;
int marrone = 8;
int arancio = 7;
int giallo = 6;


int delayTime = 100;

void setup() {
pinMode(nero, OUTPUT);
pinMode(marrone, OUTPUT);
pinMode(giallo, OUTPUT);
pinMode(arancio, OUTPUT);
}

void loop() {
forward(25);
delay(500);
backward(25);
}

void forward(int steps){
for(int i=0;i<steps;i++){
digitalWrite(nero, LOW);
digitalWrite(marrone, HIGH);
digitalWrite(arancio, HIGH);
digitalWrite(giallo, LOW);
delay(delayTime);

digitalWrite(nero, LOW);
digitalWrite(marrone, HIGH);
digitalWrite(arancio, LOW);
digitalWrite(giallo, HIGH);
delay(delayTime);

digitalWrite(nero, HIGH);
digitalWrite(marrone, LOW);
digitalWrite(arancio, LOW);
digitalWrite(giallo, HIGH);
delay(delayTime);

digitalWrite(nero, HIGH);
digitalWrite(marrone, LOW);
digitalWrite(arancio, HIGH);
digitalWrite(giallo, LOW);
delay(delayTime);
}
}

void backward (int steps){
for(int i=0;i<steps;i++){
digitalWrite(nero, HIGH);
digitalWrite(marrone, LOW);
digitalWrite(arancio, HIGH);
digitalWrite(giallo, LOW);
delay(delayTime);

digitalWrite(nero, HIGH);
digitalWrite(marrone, LOW);
digitalWrite(arancio, LOW);
digitalWrite(giallo, HIGH);
delay(delayTime);

digitalWrite(nero, LOW);
digitalWrite(marrone, HIGH);
digitalWrite(arancio, LOW);
digitalWrite(giallo, HIGH);
delay(delayTime);

digitalWrite(nero, LOW);
digitalWrite(marrone, HIGH);
digitalWrite(arancio, HIGH);
digitalWrite(giallo, LOW);
delay(delayTime);
}

}

I WOULD BE REALLY HAPPY IF YOU COULD HELP ME!

 

Dear friend can you please explain me what do you mean with your question? What do you mean "when no load is applied"? Sorry, i am not familiar with that.

I tried the software using different delay each time. I tried short delaytime and even not short delaytime.

 

Yes i did! And that's the weird! I tested the motors before mount them on the construction and i had no problem.

And as i said, the code was going pretty good. Then i soldered longer wires, does it goes the current back and is not enough for the motor??

Any suggestions to look at?

Thanks

 

Problem solved! Actually the problem was in the voltage as you noticed....!

Have a look


Thanks a lot for the help!