Question about controlling stepper motor with high low voltage

Projects Programming
1

Hi all,

The prepose of this code is to connect the stepper motor to a digital pin so that when I select high voltage, the stepper motor will run clockwise once only and stop until I switch the voltage to low and it will run counter clockwise once and stop.

In my current code my motor would run one direction continuously (looping the same command until I switch to low/high and it just continue to run until i switch again).

My question is: Is there anyway to make it run once only when I switch the state . That is including when the board just plugged in, it should not do anything until i switch voltage.

Thanks!

Here is my code

#include <Stepper.h>
#include <EEPROM.h>

int Pin_Digital_Input = 52;
int digitalState = 0;
int distanceCountAbs = 0;
const int stepsPerRevolution = 1600;

Stepper myStepper(stepsPerRevolution, 22, 24);

void setup() {
// put your setup code here, to run once:
Serial.begin(9600);

pinMode(Pin_Digital_Input, INPUT);

}

void loop() {
//read the input at the digital input pin
digitalState = digitalRead(Pin_Digital_Input);

//read the input on analog pin 0;
int sensorValue = analogRead(52);

//Convert the analog reading(0-1023)
float voltage = sensorValue * (5.0/1023.0);

if(digitalState == 1) {
  distanceCountAbs = (EEPROM.read(2)-2)/.015875;
  myStepper.setSpeed(EEPROM.read(1)); /////this will base on the user input from LCD and converted to step/s
  myStepper.step(distanceCountAbs); /////set to user input divided .015875mm/micro step
  myStepper.setSpeed(10);
  myStepper.step(2/.015875);
  delay (500);
}

if(digitalStat2 == 0){
myStepper.setSpeed(10); 
myStepper.step(-2/.015875);
myStepper.setSpeed(EEPROM.read(1)); /////this will base on the user input from LCD and converted to step/s
myStepper.step(-distanceCountAbs); //// return to home position
delay (500);
}

}

3

looks like for one condition, digitalState == 1, it moves to distanceCountAbs, but call it -2/0.015875 if the EEPROM value is 0 and then moves to 2/0.015875

in the other condition, it looks like it in the opposite directions but the values are the same.

why not just go to distanceCountAbs in the one condition and -distanceCountAbs in the other condition

  • do you need to read the EEPROM, i don't see any writes.
  • buttons are typically connected between the pin and ground, the pin configured as INPUT_PULLUP to use the internal pullup resistor which pulls the pin HIGH and when pressed, the button pulls the pin LOW.

why not (untested)

#include <Stepper.h>

int         Pin_Digital_Input  = 52;
const int   stepsPerRevolution = 1600;
Stepper     myStepper (stepsPerRevolution, 22, 24);

void loop ()
{
    if (HIGH == digitalRead (Pin_Digital_Input))
        myStepper.step (2/.015875);

    else
        myStepper.step (-2/.015875);
}

void setup () {
    Serial.begin (9600);

    pinMode (Pin_Digital_Input, INPUT_PULLUP);
    myStepper.setSpeed (10);
}
1 Like
4

the EEPROM(0) is saved with a value, I am using that to recall that value saved in the Arduino board. the write happened with another code that I have used previously hance only the call in this code.
thank for the suggestion! I will definitely try it out!

5

Just checked out the State Change example and I think that's exactly what I need! How about to have the motor commands only run once after the state changed?

7

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