Unipolar Stepper Motor & MotorShield & Potentiometer

Hello guys,

I am a quite beginner in electronics and programming.. I bought the adafruit motor shield and connected successfully an unipolar stepper motor with 5 wires. Now I want to control the motor with a potentiometer (attached it on Analog Pin = 1) and read as well how many steps the motor is driving. I did'n find any tutorial about how to use the AFmotor Library to set the analog input to write on my M3 an M4 pins.. How do I navigate the library in a way to control the motor direction and velocity (steps number) so I can drive it from my potentiometer? I am working on kind of objects which should rotate with different amount of steps depending on the potentiometer input.

p.s.
i did find a similar code, but here they don't use the motor shield..

[Edit - moderator - use the 'code' button when submitting code]
Code: Select all | TOGGLE FULL SIZE
`// program a unipolar stepper motor to be controlled by a potentiometer// a stepper motor is the best choice for controlling motor speed with the greatest accuracy// its accuracy is based on the number of ticks per rotation, like a watch motor int motorPin1 = 2;int motorPin2 = 3;int motorPin3 = 4;int motorPin4 = 5;int analogPin = 1;int delayTime = 50;int val;   // reads the input pin; val is a number coming in thats btwn 0 and 1023void setup() {  Serial.begin(9600);  pinMode(motorPin1, OUTPUT);  pinMode(motorPin2, OUTPUT);  pinMode(motorPin3, OUTPUT);  pinMode(motorPin4, OUTPUT);}void loop() {  int val = analogRead(analogPin);   // read the input pin; val is a number coming in thats btwn 0 and 1023  Serial.println(val); // makes sure that potentiometer is working  delayTime = (val /3) + 15 ; // factors in time before the motor makes another step in speed  digitalWrite(motorPin1, HIGH);   digitalWrite(motorPin2, HIGH);   digitalWrite(motorPin3, LOW);   digitalWrite(motorPin4, LOW);   delay(delayTime);  digitalWrite(motorPin1, LOW);  digitalWrite(motorPin2, HIGH);  digitalWrite(motorPin3, HIGH);  digitalWrite(motorPin4, LOW);  delay(delayTime);  digitalWrite(motorPin1, LOW);  digitalWrite(motorPin2, LOW);  digitalWrite(motorPin3, HIGH);  digitalWrite(motorPin4, HIGH);  delay(delayTime);  digitalWrite(motorPin1, HIGH);  digitalWrite(motorPin2, LOW);  digitalWrite(motorPin3, LOW);  digitalWrite(motorPin4, HIGH);  delay(delayTime);}`

I would be very happy if you could help me on this one..

thanks and best regards,
valentina
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boneva

Posts: 4
Joined: Wed Dec 19, 2012 10:15 am

Re: Unipolar Stepper Motor & MotorShield & Potentiometer

Hi,
Where did you purchase the motor shield? It looks like an older model than the one we are currently shipping.

Posts: 51969
Joined: Sat Feb 07, 2009 10:11 am

Re: Unipolar Stepper Motor & MotorShield & Potentiometer

On the website I guess, my school has a bunch of hardware that they order every year and I bought it from there.
Does that make some difference in the library?

greetings
boneva

Posts: 4
Joined: Wed Dec 19, 2012 10:15 am

Re: Unipolar Stepper Motor & MotorShield & Potentiometer

Does that make some difference in the library?

Not sure. Can you post the link to your source so we can be sure of exactly what you have there?

Posts: 51969
Joined: Sat Feb 07, 2009 10:11 am

Re: Unipolar Stepper Motor & MotorShield & Potentiometer

My source? Do you mean the exact model of the shield?
I didn't recognized the difference in the model so I just downloaded the library from the website and installed it, everything with the test script worked out.
boneva

Posts: 4
Joined: Wed Dec 19, 2012 10:15 am

Re: Unipolar Stepper Motor & MotorShield & Potentiometer

boneva wrote:My source? Do you mean the exact model of the shield?
I didn't recognized the difference in the model so I just downloaded the library from the website and installed it, everything with the test script worked out.

Posts: 12098
Joined: Thu Apr 06, 2006 4:21 pm
Location: nyc

Re: Unipolar Stepper Motor & MotorShield & Potentiometer

I bought it from http://www.watterott.com/de, but they don'have it on the website, they order it from you on adafruit.com.
the model is motorshield 1.0
boneva

Posts: 4
Joined: Wed Dec 19, 2012 10:15 am

Re: Unipolar Stepper Motor & MotorShield & Potentiometer

boneva wrote:I bought it from http://www.watterott.com/de, but they don'have it on the website, they order it from you on adafruit.com.
the model is motorshield 1.0