#include <LiquidCrystal.h>
#include <OneWire.h>
#include <DallasTemperature.h>
#define D35 35
#define D37 37
#define INT4 2
#define INT5 3

#define ON true
#define OFF false

const unsigned long temp_read_interval = 1000;
const unsigned long display_interval = 1000;
const char TEMP[12] = "Temperature ";

LiquidCrystal lcd(22, 23, 25, 27, 29, 31, 33);
OneWire oneWire(D37);
DallasTemperature sensors(&oneWire);

unsigned long time_now = 0;
unsigned long time_temp_read = 0;
unsigned long time_display = 0;

float temp;
char temp_str[5];

volatile bool state_display = OFF;
volatile bool state_serial = OFF;

void INT4_ISR() {
  state_display = ON;
}

void INT5_ISR() {
  if(state_serial)
  	state_serial = OFF;
  else
  	state_serial = ON;    
}

void setup()
{
  Serial.begin(9600);
  sensors.begin();
  lcd.begin(16,2);

  pinMode(D35, OUTPUT);

  pinMode(INT4, INPUT);
  attachInterrupt(digitalPinToInterrupt(INT4), INT4_ISR, RISING);
  pinMode(INT5, INPUT);
  attachInterrupt(digitalPinToInterrupt(INT5), INT5_ISR, RISING);
}

void loop() {
  // put your main code here, to run repeatedly:
  time_now = millis();
  
  if(time_now - time_temp_read >= temp_read_interval) {
    time_temp_read = time_now;
    sensors.requestTemperaturesByIndex(0); 
    temp = sensors.getTempCByIndex(0);
  }

  if(time_now - time_display >= display_interval) {
    time_display = time_now;

    char serialBuf[30];
    char temp_buf[7];

    if(state_display | state_serial) {
      dtostrf(temp, 4, 1, temp_str);
      sprintf(temp_buf, "%s C", temp_str);
    }

    if(state_display){
      digitalWrite(D35, HIGH);
      lcd.display();
      lcd.setCursor(0, 0);
      lcd.print(TEMP);
      lcd.setCursor(0, 1);
      lcd.print(temp_buf);
      state_display = OFF;
    } else {
      digitalWrite(D35, LOW);      
      lcd.noDisplay();
    } 
    if(state_serial) {
      strcpy(serialBuf, TEMP);
      strcat(serialBuf, " ");
      strcat(serialBuf, temp_buf);
      Serial.println(serialBuf);
    }

  }
}