Calibration setup help please

Projects Programming
1

Hello,
I am in the final stages of setting up my frameless laser harp. I am using the 28byj-48 stepper motor with an arduino uno.

I need to set the motor at a "home" position before running the loop, so I would simply like the motor to spin in one direction until a pushbutton is pressed, stopping the motor and sending it the the loop. I made the following code, however, when I place this in the void setup section, it seems to just skip over it when I go to run it. (The PB is connected to A1 as all of my digital I/O's are taken up by other components). Where am I going wrong? Also, how do I make the motor turn indefinitely until the button is pressed? ( I know I need to change 16 to something else).

if (digitalRead(button1) == LOW)
  {
    digitalWrite(13, HIGH);
    myStepper.step(16);
  } 
  else (digitalRead(button1) == HIGH);
  {
    delay(1000);
    digitalWrite(13, LOW);
    goto Initialize;
  }

Thank You!

2

So basically I just want the stepper motor to rotate in one direction continuously until I press a button on A1, then after that go to the loop program. I'm not sure how to get the motor to step while looking for the button press?

3

I'm not sure how to get the motor to step while looking for the button press?

One way:
The operative word in your question is "while".

while

5

Thanks both of you. So like this??

#include <Stepper.h>
#include <LiquidCrystal.h>
LiquidCrystal lcd(12, 7, 5, 4, 3, 2);


#define NOTE_C7  2093  //BEAM 1
#define NOTE_D7  2349  //BEAM 2
#define NOTE_E7  2637  //BEAM 3
#define NOTE_FS7 2960  //BEAM 4 
#define melodyPin 6

const int stepsPerRevolution = 16;  // change this to fit the number of steps per revolution for the 28byj-48 stepper motor.
int LaserPin = 13;                  // tells the Arduino that the laser is on pin 13
int sensor = 500; // change this value to calibrate your harp's sensor
int calPin = A1;
int direction = 1;

int note4 = 0x70;
int note3 = 0x71;
int note2 = 0x40;
int note1 = 0x47;

// initialize the stepper library on pins 8 through 11:
Stepper myStepper(stepsPerRevolution, 8, 10, 9, 11);  //Step sequence

int stepCount = 0;         // number of steps the motor has taken
int a, b, c, d = 0;        // Initating the note status markers.

void setup() {
  pinMode(LaserPin, OUTPUT);
  pinMode(calPin, INPUT);
  int button1 = digitalRead(A1);

  digitalWrite(A1, LOW);
  digitalWrite(13, HIGH);

  while(digitalRead(calPin) == HIGH) {  // while button not pressed
   myStepper.step(1);
  }

Initialize:
6

Oh and AI button is active LOW, so same code as above, but with == LOW instead of HIGH in the while statement.

8

Everything looks like its working right! the only thing left is that the button seems to give a HIGH sometimes when its not pressed. Does it need to be debounced? Isn't there something built in to fix this?

10

Thanks again Delta_G. I figured out that with the last code I posted, I have to hold the button down for it to read LOW, then release to give it a HIGH. Does that seem correct? I thought it would have the opposite effect. I do have it connected to ground, maybe thats why...

I can make it work like that though. I'm curious if I'm supposed to have it connected to Vcc instead though for the effect I want.

Many thanks!

-James