Stepper Code v0.4

//
//
//

#include <Wire.h>
#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x27, 2, 1, 0, 4, 5, 6, 7, 3, POSITIVE);  // Set the LCD I2C address

#define pot_in A3
#define rocker 9
#define PUL 7
#define DIR 6
#define ENA 5

int minimum_speed_delay = 50;
int maximum_speed_delay = 1;
int acceleration_delay = 2;
int count = 0;
int current_speed_delay = 100;

void setup() {
  lcd.begin(20, 4);
  lcd.setCursor(0, 0);
  lcd.print("Welcome to");
  lcd.setCursor(0, 1);
  lcd.print("Team Plastic");
  lcd.setCursor(0, 2);
  lcd.print("String Theory's");
  lcd.setCursor(0, 3);
  lcd.print("Plastic Extruder!");

  pinMode (PUL, OUTPUT);
  pinMode (DIR, OUTPUT);
  pinMode (ENA, OUTPUT);

  pinMode (pot_in, INPUT);
  pinMode (rocker, INPUT);

  delay(5000);
}

void loop() {
  if (digitalRead(rocker) == HIGH) {
    if (count == 0) {                //Initial acceleration to minimum speed
      lcd.clear();
      lcd.setCursor(0, 1);
      lcd.print("Motor is");
      lcd.setCursor(0, 2);
      lcd.print("accelerating");
      int current_speed_delay = 100;
      while (current_speed_delay > minimum_speed_delay) {
        digitalWrite(DIR, LOW);
        digitalWrite(ENA, HIGH);
        digitalWrite(PUL, HIGH);
        delayMicroseconds(current_speed_delay);
        digitalWrite(PUL, LOW);
        delayMicroseconds(current_speed_delay);
        int current_speed_delay = current_speed_delay - acceleration_delay;
        int count = count + 1;
      }
    }
    else if (count > 0) {             //Motor speed = multiple of potiometer reading
      lcd.clear();
      lcd.setCursor(0, 0);
      lcd.print("Motor is operating");
      lcd.setCursor(0, 2);
      lcd.print("at");
      lcd.setCursor(8, 2);
      lcd.print("RPMs");
      while (digitalRead(rocker) == HIGH) {
        digitalWrite(DIR, LOW);
        digitalWrite(ENA, HIGH);
        digitalWrite(PUL, HIGH);
        delayMicroseconds(current_speed_delay);
        digitalWrite(PUL, LOW);
        delayMicroseconds(current_speed_delay);
        int potent = analogRead(pot_in);
        current_speed_delay = constrain(potent, maximum_speed_delay, minimum_speed_delay);
        int count = count + 1;

        lcd.setCursor(3, 2);
        lcd.print(int(current_speed_delay));
      }
    }
  }
  else if (digitalRead(rocker) == LOW) {        //Turning motor off
    if (count > 0) {                            //Deceleration to 0
      lcd.clear();
      lcd.setCursor(0, 1);
      lcd.print("Motor is");
      lcd.setCursor(0, 2);
      lcd.print("decelerating");
      while (current_speed_delay < 100) {
        digitalWrite(DIR, LOW);
        digitalWrite(ENA, HIGH);
        digitalWrite(PUL, HIGH);
        delayMicroseconds(current_speed_delay);
        digitalWrite(PUL, LOW);
        delayMicroseconds(current_speed_delay);
        int current_speed_delay = current_speed_delay + acceleration_delay;
        int count = count + 1;
      }
      int count = 0;
    }
    else if (count == 0) {                                       //Motor speed = 0
      lcd.clear();
      lcd.setCursor(3, 1);
      lcd.print("Motor is off");
      while (digitalRead(rocker) == LOW) {
        delay(10);
      }
    }
  }

}