Day_3_HW.ino

#include <LiquidCrystal.h>
#include <EEPROM.h>
LiquidCrystal lcd(12,11,5,4,3,2);
const int LCD_WIDTH = 16, LCD_ROWS = 2;

const int motorPin = 9;
const int DISPLAY_PWM = 6; 
int DISPLAY_CONTRAST = 90;
const int ON_BUTTON_PIN = 7, OFF_BUTTON_PIN = 8, EXTRA_BUTTON_PIN = 13;
const int POT1_PIN = 0;
const int EEPROM_ADDRESS_LCD = 1;
const int UPDATE_TIMER = 700;

bool onButton = false;
bool offButton = false;
bool extraButton = false;
bool turnedOffRecently = false;
int pot1Value = 0;
int motorSpeed = 0;
bool isOn = false;

void setup()
{  
  DISPLAY_CONTRAST = EEPROM.read(EEPROM_ADDRESS_LCD);
  analogWrite(DISPLAY_PWM, DISPLAY_CONTRAST);
  lcd.begin(16,2);
  lcd.clear();
  lcd.print("   Power: Off");
  loadingBar();
  pinMode(ON_BUTTON_PIN, INPUT);
  pinMode(OFF_BUTTON_PIN, INPUT);
  pinMode(POT1_PIN, INPUT);
  pinMode(motorPin, OUTPUT);
  Serial.begin(9600);
}


void loop()
{
     onButton = digitalRead(ON_BUTTON_PIN);
     offButton = digitalRead(OFF_BUTTON_PIN);
     extraButton = digitalRead(EXTRA_BUTTON_PIN);
     pot1Value = analogRead(POT1_PIN);
     //Serial.println(extraButton);
     if (onButton && !isOn) {
      Serial.println("POWER ON");
      lcd.clear();
      lcd.setCursor(0,0);
      lcd.print("   Power: On");
      lcd.setCursor(0,1);
      lcd.print("Motor Speed:");
      isOn = true;
     }
     if (offButton && isOn) {
        analogWrite(motorPin, 0);
        isOn = false;
      }
     if (extraButton) {
      lcd.clear();
      Serial.println("Open Settings");
      lcd.setCursor(0,0);
      lcd.print("Settings: LCD");
      lcd.setCursor(0,1);
      lcd.print("Contrast: ");
      lcd.print(DISPLAY_CONTRAST);
      delay(500);
      //lcd.clear();
      extraButton = false;
      Serial.println(extraButton);
      while (extraButton == false) {
        Serial.println(extraButton);
        extraButton = digitalRead(EXTRA_BUTTON_PIN);
        pot1Value = analogRead(POT1_PIN);
        //DISPLAY_CONTRAST = map(pot1Value, 0, 1023, 0, 2000);
        //DISPLAY_CONTRAST = constrain(pot1Value, 0, 2000);
        DISPLAY_CONTRAST = pot1Value / 4;
        analogWrite(DISPLAY_PWM, DISPLAY_CONTRAST);
        lcd.setCursor(0,1);
        lcd.print("Contrast: ");
        lcd.print(DISPLAY_CONTRAST);
      }
      EEPROM.write(EEPROM_ADDRESS_LCD, (pot1Value/4));
      Serial.println(extraButton);
      delay(500);
      extraButton = false;
      turnedOffRecently = false;
     }      
     if (isOn) {
      lcd.clear();
      lcd.setCursor(0,0);
      lcd.print("   Power: On");
      lcd.setCursor(0,1);
      lcd.print("Motor Speed:");
      lcd.print(motorSpeed);
      delay(UPDATE_TIMER);
      turnedOffRecently = false;
      motorSpeed = map(pot1Value, 0, 1023, 0, 255);
      motorSpeed = constrain(motorSpeed, 0, 255);
      analogWrite(motorPin, motorSpeed);
     }
     else if (!turnedOffRecently) {
      lcd.clear();
      lcd.setCursor(0,0);
      lcd.print("   Power: Off");
      analogWrite(motorPin, 0);
      turnedOffRecently = true;
     }
}

void loadingBar() {
    turnedOffRecently = false;
    Serial.println("LOADING");
    lcd.clear();
    lcd.setCursor(0,0);
    lcd.print("   Loading...");
    lcd.setCursor(0,1);
    lcd.print("[");
    lcd.setCursor(15,1);
    lcd.print("]");
    String load = "=";
    int i = 1;
  while (i <= 14) {
    lcd.setCursor(i-1,1);
    if (i == 1) {
      lcd.setCursor(1,1);
    }
    lcd.print(load);
    lcd.setCursor(i,1);
    lcd.print(">");
    delay(random(300,2000));
    i++;
  }
  lcd.print("]");
}