#include <LiquidCrystal.h>
#include <ArduinoJson.h>

LiquidCrystal lcd(12, 11, 10, 9, 8, 7);
const float BETA = 3950; // should match the Beta 
// Coefficient of the thermistor
float celsiusOld = 0.0;
int analogValue = 0;
float celsius = 0.0;
const int LED_ALARM_HIGH = 6;
const int LED_ALARM_LOW = 5;
const int LCD_PIN = 4;
int value = LOW;
int valueOld = LOW;

void setup() {
  // put your setup code here, to run once:
  lcd.begin(16, 2);
  analogValue = analogRead(A0);
  celsius = 1 / (log(1 / (1023. / analogValue - 1)) /
  BETA + 1.0 / 298.15) - 273.15;
  lcd.print(celsius);
  pinMode(LED_ALARM_HIGH, OUTPUT);
  pinMode(LED_ALARM_LOW, OUTPUT);
  pinMode(LCD_PIN, INPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
  analogValue = analogRead(A0);
  celsius = 1 / (log(1 / (1023. / analogValue - 1)) /
  BETA + 1.0 / 298.15) - 273.15;
  shouldDisplay();
  tempCheck();
}

void shouldDisplay() {
  float diff = celsius - celsiusOld;
  if (diff < 0) {diff = -diff;}
  if (diff > 2.8) {
    lcd.clear();
    lcd.print(celsius);
  }
  celsiusOld = celsius;
}

void greet() {
  value = digitalRead(LCD_PIN);
  valueOld = LOW;
  if (value == HIGH && valueOld == LOW) {
    lcd.clear();
    lcd.print("Good Morning!");
  }
  valueOld = value;
  
}

void tempCheck() {
  if (celsius > 40) {
    digitalWrite(LED_ALARM_HIGH, HIGH);
  } else {
    digitalWrite(LED_ALARM_HIGH, LOW);
  }
  if (celsius < 10) {
    digitalWrite(LED_ALARM_LOW, HIGH);
  } else {
    digitalWrite(LED_ALARM_LOW, LOW);
  }
}