Final answer:
To increase the speed of your stepper motor, modify the value set using the setSpeed() function in your code.
Step-by-step explanation:
To increase the speed of your stepper motor, you can modify the value set using the setSpeed() function in your code. The current value of 1500 determines the maximum speed in steps per second. You can experiment with different values to increase the speed until you find the desired speed. For example, you can try increasing the value to 2000 or higher.
Here's an updated snippet of your code with the setSpeed() value modified:
stepper.setSpeed(2000);