#include <LiquidCrystal.h>

// Initialize the library with the numbers of the interface pins
LiquidCrystal lcd(8, 9, 4, 5, 6, 7);  // RS, E, D4, D5, D6, D7

// This constant won't change:
const int Up1_buttonPin = 2;    // the pin that the pushbutton is attached to
const int Down1_buttonPin = 3;
const int Up10_buttonPin = 4;
const int Reset_buttonPin = 5;

// Variables that will change:
int Counter = 0;   // counter for the number of button presses
int Up1_buttonState = 0;         // current state of the up button +1
int Up1_lastButtonState = 0;     // previous state of the up button +1
int Down1_buttonState = 0;       // current state of the down button -1
int Down1_lastButtonState = 0;   // previous state of the down button -1
int Up10_buttonState = 0;        // current state of the up button +10
int Up10_lastButtonState = 0;    // previous state of the up button +10
int Reset_buttonState = 0;       // current state of the reset button
int Reset_lastButtonState = 0;   // previous state of the reset button
bool ButtonPress = false;

void setup() {
  Serial.begin(9600);
  pinMode(Up1_buttonPin, INPUT_PULLUP);
  pinMode(Down1_buttonPin, INPUT_PULLUP);
  pinMode(Up10_buttonPin, INPUT_PULLUP);
  pinMode(Reset_buttonPin, INPUT_PULLUP);
  
  lcd.begin(16, 2);  // initialize the lcd for 16 chars 2 lines
  lcd.setCursor(0, 0);
  lcd.print("Please Select:");
  lcd.setCursor(2, 1); // position the cursor
  lcd.print(Counter);
}
 
void loop() {
  CheckUp1();
  CheckDown1();
  CheckUp10();
  CheckReset();
  if (ButtonPress) {
    ButtonPress = false;
    lcd.setCursor(2, 1);
    lcd.print("               ");
    lcd.setCursor(2, 1);
    lcd.print(Counter);
  }
}

void CheckUp1() {
  Up1_buttonState = digitalRead(Up1_buttonPin);
  // compare the buttonState to its previous state
  if (Up1_buttonState != Up1_lastButtonState) {
    // if the state has changed, increment the counter
    if (Up1_buttonState == LOW) {
      ButtonPress = true;
      Counter++;
      Serial.println("on");
      Serial.print("number of button pushes: ");
      Serial.println(Counter);
    } else {
      Serial.println("off");
    }
    // Delay a little bit to avoid bouncing
    delay(50);
  }
  // save the current state as the last state, for next time through the loop
  Up1_lastButtonState = Up1_buttonState;
}

void CheckDown1() {
  Down1_buttonState = digitalRead(Down1_buttonPin);
  // Compare the button state to its previous state
  
  if (Down1_buttonState != Down1_lastButtonState) {
    
    // if the state has changed, increment the counter
    
    if (Down1_buttonState == LOW) {
      ButtonPress = true;
      Counter--;
      Serial.println("on");
      Serial.print("number of button pushes: ");
      Serial.println(Counter);
    } else {
      Serial.println("off");
    }
    // Delay a little bit to avoid bouncing
    delay(50);
  }
  // save the current state as the last state, for next time through the loop
  Down1_lastButtonState = Down1_buttonState;
}

void CheckUp10() {
  Up10_buttonState = digitalRead(Up10_buttonPin);
  // Compare the button state to its previous state
  
  if (Up10_buttonState != Up10_lastButtonState) {
    
    // if the state has changed, increment the counter
    
    if (Up10_buttonState == LOW) {
      ButtonPress = true;
      Counter += 10;
      Serial.println("on");
      Serial.print("number of button pushes: ");
      Serial.println(Counter);
    } else {
      Serial.println("off");
    }
    // Delay a little bit to avoid bouncing
    delay(50);
  }
  // save the current state as the last state, for next time through the loop
  Up10_lastButtonState = Up10_buttonState;
}

void CheckReset() {
  Reset_buttonState = digitalRead(Reset_buttonPin);
  // Compare the button state to its previous state
  
  if (Reset_buttonState != Reset_lastButtonState) {
    
    // if the state has changed, reset the counter
    
    if (Reset_buttonState == LOW) {
      ButtonPress = true;
      Counter = 0;
      Serial.println("on");
      Serial.print("Counter reset: ");
      Serial.println(Counter);
    } else {
      Serial.println("off");
    }
    // Delay a little bit to avoid bouncing
    delay(50);
  }
  // save the current state as the last state, for next time through the loop
  Reset_lastButtonState = Reset_buttonState;
}