Arduino + Driver Board & Stepper motor

Just a little update.

The 9v battery connectors arrived last night and I hooked it all up and loaded on an sketch from the example folder and it runs!

Really pleased to see it working off the batteries.

I'm not sure if the little motor will be upto the job (of turning a drive bolt) but I do have a chunky motor at hand if needed.

The motor isn't turning smoothly with the example code I used (I think it's doing a 1/4 turn then stops then a 1/4 turn ect.)

Here is the Code -

/*

Stepper Motor Control - one revolution

This program drives a unipolar or bipolar stepper motor.

The motor is attached to digital pins 8 - 11 of the Arduino.

The motor should revolve one revolution in one direction, then

one revolution in the other direction. 

Created 11 Mar. 2007

Modified 30 Nov. 2009

by Tom Igoe

*/

#include <Stepper.h>

const int stepsPerRevolution = 200;  // change this to fit the number of steps per revolution

                                     // for your motor

// initialize the stepper library on pins 8 through 11:

Stepper myStepper(stepsPerRevolution, 8,9,10,11);           

void setup() {

  // set the speed at 60 rpm:

  myStepper.setSpeed(60);

  // initialize the serial port:

  Serial.begin(9600);

}

void loop() {

  // step one revolution  in one direction:

   Serial.println("clockwise");

  myStepper.step(stepsPerRevolution);

  delay(500);

   // step one revolution in the other direction:

  Serial.println("counterclockwise");

  myStepper.step(-stepsPerRevolution);

  delay(500);

}

I need to work out how to get it to turn at 1rpm.

Here's a snap shot of it all connected up -

Just a little update.

The 9v battery connectors arrived last night and I hooked it all up and loaded on an sketch from the example folder and it runs!

Really pleased to see it working off the batteries.

I'm not sure if the little motor will be upto the job (of turning a drive bolt) but I do have a chunky motor at hand if needed.

The motor isn't turning smoothly with the example code I used (I think it's doing a 1/4 turn then stops then a 1/4 turn ect.)

Here is the Code -

/*

Stepper Motor Control - one revolution

This program drives a unipolar or bipolar stepper motor.

The motor is attached to digital pins 8 - 11 of the Arduino.

The motor should revolve one revolution in one direction, then

one revolution in the other direction. 

Created 11 Mar. 2007

Modified 30 Nov. 2009

by Tom Igoe

*/

#include <Stepper.h>

const int stepsPerRevolution = 200;  // change this to fit the number of steps per revolution

                                     // for your motor

// initialize the stepper library on pins 8 through 11:

Stepper myStepper(stepsPerRevolution, 8,9,10,11);           

void setup() {

  // set the speed at 60 rpm:

  myStepper.setSpeed(60);

  // initialize the serial port:

  Serial.begin(9600);

}

void loop() {

  // step one revolution  in one direction:

   Serial.println("clockwise");

  myStepper.step(stepsPerRevolution);

  delay(500);

   // step one revolution in the other direction:

  Serial.println("counterclockwise");

  myStepper.step(-stepsPerRevolution);

  delay(500);

}

I need to work out how to get it to turn at 1rpm.

Here's a snap shot of it all connected up -

Stuart

this line here gives you the answer I think you're looking for

myStepper.setSpeed(60);

it even says so above it.

  // set the speed at 60 rpm:

Have you tried it?

Does this motor take 200 pulses to do a full revolution.?

From the limited information this supplier gave (despite suggesting they had a forum)

Step angle: 5.625 x 1/64
    Reduction ratio: 1/64

Comparing it with the others from the same factory that are a little clearer, the stepper motor is 5.625 deg and a 64:1 reduction.

360 deg divided by 5.625 deg = 64.

It also has a 64:1 ratio reduction, so therefore 64 x 64 = 4096 steps for a full revolution.

Mark

Hi Mark, yeah it was set to 60.

To be honest, I think I've got in a complete muddle lol

I was hoping to pinch the example sketch and just tweak it, but I can't seem to get it to work.

Stuart.

You need to check to see what is happening, before you can rectify the problem.

As you know delay(1000) adds a one second delay before moving to the next instruction.

I would change this

const int stepsPerRevolution = 200

to

const int stepsPerRevolution = 4096

and this

myStepper.setSpeed(60);

to

myStepper.setSpeed(1);

Uload it and try again.

It should do one whole revolution, wait 0.5 secs, then reverse (using the code ** with edits** in your post).

The 9 volts is because some motor drivers won't work below 7v, its just the way they are.

I'm keen to see the end result because I've been asked to do a similar thing ... (except I don't have the scope).

I was thinking of using the same motor.

mark