Stepper tester Oct 8 2020 v01

/*
  Stepper motor example - October 8, 2020

  To use this sketch:

  1. Attach 5+v (from the Arduino) to the pins on the motor controller marked [ENA+], [PUL+] and [DIR+]
  2. Attach the Arduino pins 2/3/4 to the pins on the motor controller.

*/

int motor_1__enable_pin = 2;
int motor_1__direction_pin = 3;
int motor_1__step_pin = 4;

int motor_1__rotation_speed_rpms = 30; // This is where you put the RPMs that you want the motor to spin at. Note the motor speed limits above!
int motor_1__direction_setting = 1; // This is set to zero or 1
int motor_1__steps_per_turn = 200; // This is the physical steps per turn of the motor itself.
int motor_1__microstep_setting = 1; // This is the microstep setting being used. (value must be 1 or some power of 2)

int motor_1__half_step_interval = 0; // This is a milliseconds time for a half-step to occur.
int motor_1__step_pin_state = 1; // This is alternated between zero and 1.
unsigned long motor_1__begin_time = 0;
unsigned long motor_1__current_time = 0;


void setup() {
  Serial.begin(9600);

  pinMode(motor_1__enable_pin, OUTPUT);
  pinMode(motor_1__direction_pin, OUTPUT);
  pinMode(motor_1__step_pin, OUTPUT);

  set_motor_1_speed();
  set_motor_1_direction();

  Serial.println("Exiting setup()");
}

void loop() {

  check_motor_1();

}


void set_motor_1_speed() {
  // float types are used because these numbers can easily be too large for an int type.
  float motor_effective_steps_per_turn = motor_1__steps_per_turn * motor_1__microstep_setting;
  float double_motor_speed = 2 * motor_1__rotation_speed_rpms; // Since the 'on' and 'off' steps both must be timed, we need to count both.
  float motor__total_pulses_per_minute = motor_effective_steps_per_turn * double_motor_speed;
  motor_1__half_step_interval = (int) 60000 / motor__total_pulses_per_minute;
  Serial.print("motor_1__half_step_interval = ");
  Serial.println(motor_1__half_step_interval);
}

void set_motor_1_direction() {
  digitalWrite(motor_1__direction_pin, motor_1__direction_setting);
}

void check_motor_1() {
  motor_1__current_time = millis();
  if (motor_1__current_time >= motor_1__begin_time) {
    if (motor_1__current_time >= (motor_1__begin_time + motor_1__half_step_interval)) {
      if (motor_1__step_pin_state == 1) {
        motor_1__step_pin_state = 0;
      }
      else {
        motor_1__step_pin_state = 1;
      }
      digitalWrite(motor_1__step_pin, motor_1__step_pin_state);
      motor_1__begin_time = millis();
    }
  }
  else {
    motor_1__begin_time = millis();
  }
}