SPDT Switch, Stepper Motor, Limit Switches and Arduino Uno

Projects General Guidance
2

If there are just two positions for the elevator then a simple push-button switch will work fine.

You need a variable to record whether the elevator is at the top, the bottom or movingUp or movingDown ('T' 'B' 'U' and 'D')

then the button control logic would be something like this

void (checkButton) {
  buttonPressed = digitalRead(buttonPin);
  if (buttonPressed == LOW) { // assumes LOW when pressed
    if (motorState == 'T') {
       motorState = 'D';
    }
    if (motorState == 'B') {
      motorState = 'U'
    }
  }
}

and the motor move logic would be something like

void motorMove() {
  if (motorState == 'U') {
    // code to move up one step
    topLimitState = digitalRead(topLimitPin);
    if (topLimitState == LOW) {
       motorState = 'T';
    }
  }
  // similarly for going down
}

...R