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Controlling a 4-wire bipolar stepper motor using firmata (arduino UNO + motor sheild)

[0 Replies]
- 09-Aug-2013 10:56 AM
- Forum: Integration and Hardware
Hello,

I am relatively new to arduino and processing. I have a 4-wire bipolar stepper motor which I can control with arduino UNO + the arduino motor shield using the following (standard example) code in the arduino IDE:

Arduino code:
1. ```
#include <Stepper.h>
 
const int spr = 20; // motor steps per revolution
const int pwm_cha = 3;
const int pwm_chb = 11;
const int dir_cha = 12;
const int dir_chb = 13;
const int brake_cha = 9;
const int brake_chb = 8;

Stepper stepper(spr, dir_cha, dir_chb);

void setup()
{
    pinMode(pwm_cha, OUTPUT);
    pinMode(pwm_chb, OUTPUT);
    pinMode(brake_cha, OUTPUT);
    pinMode(brake_chb, OUTPUT);
    digitalWrite(pwm_cha, HIGH);
    digitalWrite(pwm_chb, HIGH);
    digitalWrite(brake_cha, LOW);
    digitalWrite(brake_chb, LOW);

    stepper.setSpeed(50);
 }
 
void loop()
{
  stepper.step(spr);
  delay(2000);
}
```
The code basically just turns a 20-step (or any other "_"-step) motor for one complete revolution, then pauses for two seconds, and turns for another revolution etc. (I have it wired up to an arduino motor shield atop an arduino UNO, similarly to this picture, except the motor has 4 wires, so with an extra pair of wires going to the "B"+/- connections.)

My question is this: How do I do just this exact thing using Processing?
(It's a rather elementary sort of task but I've been completely unable to find it anywhere on the arduino or processing fora or reference or anywhere else at all.)

Is there a simple way to port the arduino code from arduino IDE to processing? Can I use the arduino stepper motor libraries in conjunction with processing, or does processing have its own such libraries?

I need to control some other sensors and data analysis in processing based on inputs which vary with the position of the motor, which I only need to sweep through a prespecified number of steps on each run of the program (I don't need any motor control commands from the keyboard or anything like that). I wanted to streamline the whole motor-control/sensory input/data aquisition into one easy processing sketch.

Suggestions?

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