#include <LiquidCrystal_I2C.h>
#include <Servo.h>

#define I2C_ADDR    0x27
#define LCD_COLUMNS 20
#define LCD_LINES   4

LiquidCrystal_I2C lcd(I2C_ADDR, LCD_COLUMNS, LCD_LINES);

Servo myservo;  // create servo object to control a servo
// twelve servo objects can be created on most boards

int montant = 0;                // montant de l'utilisateur
int inputPin = 2;               // choose the input pin (for PIR sensor)
int pirState = LOW;             // we start, assuming no motion detected
int val = 0;                    // variable for reading the pin status
const int buttonPin = 8;
int oldValue = LOW; // default/idle value for pin 8 is low.

int pos = 0;    // variable to store the servo position


void setup() {
  pinMode(inputPin, INPUT);     // declare sensor as input
  // Init lcd
  lcd.init();
  lcd.backlight();
  lcd.setCursor(0, 0);
  lcd.print("votre montant :");
  pinMode(buttonPin, INPUT);
  myservo.attach(9);  // attaches the servo on pin 9 to the servo object

  Serial.begin(9600);
}

void loop() {


  //motionn sensor + lcd update
  val = digitalRead(inputPin);  // read input value
  if (val == HIGH) {            // check if the input is HIGH
    if (pirState == LOW) {
      // we have just turned on
      Serial.println("Motion detected!");
      montant += 500;
      lcd.setCursor(0, 1);
      lcd.print(montant);
      // We only want to print on the output change, not state
      pirState = HIGH;
    }
  } else {
    if (pirState == HIGH) {
      // we have just turned of
      Serial.println("Motion ended!");
      // We only want to print on the output change, not state
      pirState = LOW;
    }
  }



  //button de choix
  // Read the value of pin 8.
  int newValue = digitalRead(buttonPin);
  if (newValue != oldValue)
  {
    if (newValue == HIGH)
    {
      Serial.println("The button is pressed.");
      if (montant >= 500) {
        montant -= 500;
      }
      lcd.print("");
      lcd.setCursor(0, 1);
      lcd.print(montant);
      for (pos = 0; pos <= 180; pos += 1) { // goes from 0 degrees to 180 degrees
        // in steps of 1 degree
        myservo.write(pos);              // tell servo to go to position in variable 'pos'                   // waits 15ms for the servo to reach the position
      }
    }
    else
    {
      Serial.println("The button is released.");
      for (pos = 180; pos >= 0; pos -= 1) { // goes from 180 degrees to 0 degrees
        myservo.write(pos);              // tell servo to go to position in variable 'pos'                   // waits 15ms for the servo to reach the position
      }
    }
    // Remember the value for the next time.
    oldValue = newValue;
  }


}