Controlling stepper speed

[barriex]

I am using two 28BJY-48 stepper motors and ULN2003 driver with library AccelStepper.h in Arduino Nano. I have set them up and are working as expected at a fixed speed. Can anyone please point me to an example sketch that changes stepper speed on the fly. eg. Calling a function that changes the speed from the main loop..

[Grumpy_Mike]

What you need to do is to set the maximum speed and acceleration rate in the setup function.

#include <AccelStepper.h>
#define EN 10
#define RST 11
#define STEP 12
#define DIR 13
#define INTERFACE_TYPE 1


// Create a new instance of the AccelStepper class:
AccelStepper stepper = AccelStepper(INTERFACE_TYPE, STEP, DIR);

void setup(){
// Set the maximum speed and acceleration for calibration:
  stepper.setCurrentPosition(0); // set this point as zero
  stepper.setMaxSpeed(700); // note 1000 is the fastest speed for this library
  stepper.setAcceleration(500);
}
void loop(){
stepper.moveTo(400);
delay(2000);
stepper.moveTo(0);
delay(2000);
}

Play with the number in the stepper.setAcceleration call to change the amount of acceleration.

[barriex]

Thank you. In order to change speed on the fly I need to add:-
stepper.setSpeed(newSpeed)
and
runSpeed() or should it be stepper.run() at bottom of loop?

[Grumpy_Mike]

Not sure sorry, try both.