Push button problem for stepper motor

[lappieslatandra]

Hi there
I use a stepper motor with a potentiometer for speed and a push button for direction.
the problem i have because it is a mechanical switch it switch the direction a few times if i press the button one can someone please help.
see code below

// Defin pins
 
int reverseSwitch = 2;  // Push button for reverse
int driverPUL = 7;    // PUL- pin
int driverDIR = 6;    // DIR- pin
int spd = A0;     // Potentiometer
 
// Variables
 
int pd = 500;       // Pulse Delay period
boolean setdir = LOW; // Set Direction
 
// Interrupt Handler
 
void revmotor (){
 
  setdir = !setdir;
  
}
 
 
void setup() {
 
  pinMode (driverPUL, OUTPUT);
  pinMode (driverDIR, OUTPUT);
  attachInterrupt(digitalPinToInterrupt(reverseSwitch), revmotor, FALLING);
  
}
 
void loop() {
  
    pd = map((analogRead(spd)),0,1023,2000,50);
    digitalWrite(driverDIR,setdir);
    digitalWrite(driverPUL,HIGH);
    delayMicroseconds(pd);
    digitalWrite(driverPUL,LOW);
    delayMicroseconds(pd);
 
}

[gcjr]

mechanical buttons bounce and using an interrupt is not a good approach

consider for button detection

// simple button processing

const byte butPin = A1;
byte       ledPin = 13;

byte butState;

enum { Off = HIGH, On = LOW };

// -----------------------------------------------------------------------------
void loop (void)
{
    byte but = digitalRead (butPin);

    if (butState != but)  {     // check that button state changed
        butState = but;
        delay (10);         // debounce

        if (LOW == but)     // button pressed
            digitalWrite (ledPin, ! digitalRead (ledPin));
    }
}

// -----------------------------------------------------------------------------
void setup (void)
{
    digitalWrite (ledPin, Off);
    pinMode      (ledPin, OUTPUT);

    pinMode     (butPin, INPUT_PULLUP);
    butState  = digitalRead (butPin);
}

[lappieslatandra]

Hi There
Thank you for the information, but I am new with programming and I am not sure how to incorporate the code you send into my code.
Can you please help?
Regards
Johannes

[anon57585045]

Maybe better to include your code in his.

Substitute the thing you want done when the button is pressed, for the one line LED toggle demo in the sketch. I guess it would be

  setdir = !setdir;

[TomGeorge]

Hi, @lappieslatandra
How have you got your button wired?

Can we please have a circuit diagram?
An image of a hand drawn schematic will be fine, include ALL power supplies, component names and pin labels.
Please no Fritzy diagrams.

Thanks.. Tom...

[groundFungus]

In addition to the software debounce shown by @gcjr there is hardware debounce. Hardware debounce is a 0.1uF (or so) ceramic capacitor placed across the switch.

The best way to wire a switch with modern microcontrollers is from ground to an input that is set to pinMode INPUT_PULLUP.

[lappieslatandra]

Hi there
I will try a 0.1uf capacitor and see what it does.
thank you for the advice.
Johannes