const int ledPin =  LED_BUILTIN;      // the number of the LED pin
int ledState = LOW;                   // ledState used to set the LED

// Generally, you should use "unsigned long" for variables that hold time
// The value will quickly become too large for an int to store

unsigned long motor_read_time = 0;     // will store last time LED was updated
unsigned long motor_last_stepped = 0;

const long read_interval = 1000;           // interval at which to blink (milliseconds)
const long step_interval = 2000;

void setup() {
  pinMode(ledPin, OUTPUT);
}

void loop() {
  // check to see if it's time to blink the LED; that is, if the difference
  // between the current time and last time you blinked the LED is bigger than
  // the interval at which you want to blink the LED.
  // millis() will overrun after 50 days
  unsigned long loop_time = millis();

 // using while instead of if: 
 // https://forum.arduino.cc/t/demonstration-code-for-several-things-at-the-same-time/217158/32
 // post 32
  while (loop_time - motor_read_time >= read_interval) {
    // save the last time you blinked the LED
    motor_read_time += read_interval;

    read_motor();

  }
}


void read_motor(){

    // if the LED is off turn it on and vice-versa:
    if (ledState == LOW) {
      ledState = HIGH;
    } else {
      ledState = LOW;
    }

    // set the LED with the ledState of the variable:
    digitalWrite(ledPin, ledState);
}