#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x27,20,4);  // set the LCD address to 0x27 for a 16 chars and 2 line display

//Variables
int counter = 0;
int addup = 2;
int adddown = 3;
int MotorButton = 4;
int MotorStart = 11;
String motorState;
int motordir;


void setup()
{
  pinMode(MotorButton,INPUT_PULLUP);
  pinMode(MotorStart,OUTPUT);
  pinMode(adddown, INPUT_PULLUP);
  pinMode(addup, INPUT_PULLUP);
  attachInterrupt(digitalPinToInterrupt(adddown),ISR_counterdown,FALLING);
  attachInterrupt(digitalPinToInterrupt(addup),ISR_counterup,FALLING);
  lcd.init();                      // initialize the lcd 
  // Print a message to the LCD.
  lcd.backlight();
  lcd.setCursor(0,0);
  lcd.print("Hello!");
  lcd.setCursor(0,1);
  lcd.print("This is a mixer.");
  delay(3000);
  lcd.setCursor(0,0);
  lcd.print("Minimum speed 30");
  lcd.setCursor(0,1);
  lcd.print("Maximum speed 70");
  delay(3000);
  lcd.clear();

  
}


void loop()
{
  lcd.setCursor(0,0);
  lcd.print("Counter = ");
  lcd.setCursor(10,0);
  lcd.print(counter);
  lcd.setCursor(0,1);

  if (MotorButton == HIGH){
    
    motorState = "on";
    MotorStart = HIGH;

  } else {
    motorState = "off";
    MotorStart = LOW;
  }

  lcd.print("Motor State = ");
  lcd.setCursor(13,1);
  lcd.print(motorState);

   if (addup == HIGH && adddown == HIGH){
    changeDirection();
    delay(1000);
  }

  
}




 


void changeDirection (){

if (motordir == HIGH){
  motordir = LOW;
} else if(motordir == LOW) {
  motordir = HIGH;
}

}



void ISR_counterup(){
 static unsigned long previousTime = 0;
 unsigned long currentTime = millis();
 int deltaTime =300;
 if (currentTime - previousTime > deltaTime){
  counter = counter + 1;
 }
 previousTime = currentTime;
}

void ISR_counterdown(){
 static unsigned long previousTime = 0;
 unsigned long currentTime = millis();
 int deltaTime =300;
 if (currentTime - previousTime > deltaTime){
  counter = counter - 1;
 }
 previousTime = currentTime;
}