How to change the sketch for the slider on Arduino?

Question

Arduino

Good time of the day! Please tell me how and where to change the slider movement parameters for the camera? I dug up the sketch on the Internet :( Everything works, BUT I need to increase the length of the passage in a straight line. Now it moves by 400 mm, and I need to change the movement to 900 mm .....

The sketch itself:

#include <AccelStepper.h>
#include <MultiStepper.h>
MultiStepper steppers;

// Define the Pins used
#define home_switchX 9 // x end switch
// Define some steppers and the pins the will use


AccelStepper stepperX(1, 2, 5);
AccelStepper stepperY(1, 3, 6);

long initial_homing=-1;  // Used to Home Stepper at startup


void setup()
{ 
   pinMode(8, OUTPUT);
   digitalWrite(8, LOW);

    pinMode(home_switchX, INPUT_PULLUP);

    delay(5);  // Wait for EasyDriver wake up

    Serial.begin(115200);
    stepperX.setMaxSpeed(3000.0);
    stepperX.setAcceleration(1000.0);
       
    // homeing x
     while (digitalRead(home_switchX))
     {  // Make the Stepper move CCW until the switch is activated   
        stepperX.moveTo(initial_homing);  // Set the position to move to
        initial_homing--;  // Decrease by 1 for next move if needed
        stepperX.run();  // Start moving the stepper
       // delay(1);
     }
      stepperX.setCurrentPosition(0);  // Set the current position as zero for now
      initial_homing=1;
      while (!digitalRead(home_switchX))
      { // Make the Stepper move CW until the switch is deactivated
         stepperX.moveTo(initial_homing); 
         stepperX.run();
         initial_homing++;
         //delay(2);
      }
 
    stepperX.setCurrentPosition(0);

    stepperX.setMaxSpeed(1000);
    stepperX.setAcceleration(1000);

    stepperY.setMaxSpeed(1000);
    stepperY.setAcceleration(1000);

    steppers.addStepper(stepperX);
    steppers.addStepper(stepperY);
}

void loop()
{
 long positions[2];

    if(digitalRead(home_switchX)) //end switch abused as input to move between position 1 and 12000
    {
    delay(100);
    positions[0] = 0;
    positions[1] = 0;
    steppers.moveTo(positions);

    steppers.runSpeedToPosition();

    delay(100);
    positions[0] = 3200 * 8;
    positions[1] =  -1400;
    steppers.moveTo(positions);
    steppers.runSpeedToPosition();
    }

}

Tell me in which direction to move :) Thank you in advance!

Answer 1

Right here:

positions[0] = 3200 * 8;
positions[1] = -1400;

Obviously, the figures must be increased by a factor of 900/400 , i.e. at 2.25