#include <LCD_I2C.h>

LCD_I2C display(0x27, 16, 2);

#define POT_PIN A0
#define ENABLE_PIN  3
#define SETPOINT_PIN  2
#define BUZZER_PIN  4

int sensorValue;
int setPoint = 50;
bool en = false;

void setup() {
  display.begin();
  display.backlight();

  pinMode(ENABLE_PIN, INPUT_PULLUP);
  pinMode(SETPOINT_PIN, INPUT_PULLUP);
  pinMode(BUZZER_PIN, OUTPUT);
}

void loop() {
  //menampilkan nilai baca sensor
  sensorValue = map(analogRead(POT_PIN), 0, 1023, 0, 100);
  char buffer[16];
  sprintf(buffer, "Sensor: %3d", sensorValue);
  display.setCursor(0, 0);
  display.print(buffer);

  //menampilkan nilai set point
  if (digitalRead(SETPOINT_PIN) == 0) {
    while (digitalRead(SETPOINT_PIN) == 0) {}
    setPoint += 2;
    if (setPoint > 80) setPoint = 50;
  }
  char buffer2[6];
  sprintf(buffer2, "Sp:%d", setPoint);
  display.setCursor(0, 1);
  display.print(buffer2);

  //menampilkan status enable
  if (digitalRead(ENABLE_PIN) == 0) {
    while (digitalRead(ENABLE_PIN) == 0) {}
    en = !en;
  }
  if (en) {
    display.setCursor(6, 1);
    display.print("eN:ON ");
  } else {
    display.setCursor(6, 1);
    display.print("eN:OFF");
  }

  //menampilkan status buzzer
  if (en && sensorValue > setPoint) {
    display.setCursor(13, 1);
    display.print("B:H");
    alarm(3, 100);
    delay(1000);
  } else {
    display.setCursor(13, 1);
    display.print("B:M");
  }
}

void alarm(int times, long time) {
  for (int i = 0; i < times; i++) {
    tone(BUZZER_PIN, 2500);
    delay(time);
    noTone(BUZZER_PIN);
    delay(time);
  }
}