#include <Wire.h>


void setup()
{
  Wire.begin();

  Serial.begin(9600);
  while (!Serial);             // Leonardo: wait for serial monitor
  Serial.println("\nI2C Scanner");
}


void loop()
{
  byte error, address;
  int nDevices;

  Serial.println("Scanning...");

  nDevices = 0;
  for(address = 1; address < 127; address++ )
  {
    // The i2c_scanner uses the return value of
    // the Write.endTransmisstion to see if
    // a device did acknowledge to the address.
    Wire.beginTransmission(address);
    error = Wire.endTransmission();

    if (error == 0)
    {
      Serial.print("I2C device found at address 0x");
      if (address<16)
        Serial.print("0");
      Serial.print(address,HEX);
      Serial.println("  !");

      nDevices++;
    }
    else if (error==4)
    {
      Serial.print("Unknown error at address 0x");
      if (address<16)
        Serial.print("0");
      Serial.println(address,HEX);
    }   
  }
  if (nDevices == 0)
    Serial.println("No I2C devices found\n");
  else
    Serial.println("done\n");

  delay(5000);           // wait 5 seconds for next scan
}

#include <Wire.h>
#include "RTClib.h"

RTC_DS3231 rtc;

char daysOfTheWeek[7][12] = {"Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"};

void setup ()
{
  Serial.begin(9600);
  delay(3000); // wait for console opening

  if (! rtc.begin()) {
    Serial.println("Couldn't find RTC");
    while (1);
  }

  if (rtc.lostPower()) {
    Serial.println("RTC lost power, lets set the time!");

  }
}

void loop ()
{
    DateTime now = rtc.now();
   
    Serial.println("Current Date & Time: ");
    Serial.print(now.year(), DEC);
    Serial.print('/');
    Serial.print(now.month(), DEC);
    Serial.print('/');
    Serial.print(now.day(), DEC);
    Serial.print(" (");
    Serial.print(daysOfTheWeek[now.dayOfTheWeek()]);
    Serial.print(") ");
    Serial.print(now.hour(), DEC);
    Serial.print(':');
    Serial.print(now.minute(), DEC);
    Serial.print(':');
    Serial.print(now.second(), DEC);
    Serial.println();
   
   
    delay(1000);
}

#include <LiquidCrystal.h>

// Arduino pins used for LCD
LiquidCrystal lcd(2, 3, 4, 5, 6, 7);
int decimalPrecision = 1;


void setup() {
    analogReference(DEFAULT);
    lcd.begin(16, 2);
     Serial.begin(9600);
     
   
}

void loop() {
    float temperature = 0.0;   // stores the calculated temperature
   
 
   
       
        temperature = ((float)analogRead(A3) * 5.0 / 1024.0) - 0.4;
        temperature = temperature / 0.0195;
       
    float temperature1= 0.0;
    temperature1 = ((float)analogRead(A5) * 5.0 / 1024.0) - 0.4;
        temperature1 = temperature1 / 0.0195;
        delay(5000);
         Serial.print(temperature,decimalPrecision);                                                 /* display in Serial monitor the temperature in Celcius*/
            Serial.println(" T1 °C");
           
            Serial.print(temperature1,decimalPrecision);
            Serial.println(" T2 °C");
   
   
    // display the temperature on the LCD
    lcd.setCursor(0, 0);
    lcd.print("T1=");
    lcd.print(temperature,decimalPrecision);
    lcd.print((char)223);
    lcd.print("C");
    lcd.setCursor(10, 0);
    lcd.print("T3= ");
   
    lcd.setCursor(0, 1);
    lcd.print("T2=");
    lcd.print(temperature1,decimalPrecision);
    lcd.print((char)223);
    lcd.print("C");
    lcd.setCursor(10, 1);
    lcd.print("T4= ");
   }
   
   

// Arduino pins used for LCD
LiquidCrystal lcd(2, 3, 4, 5, 6, 7);
int decimalPrecision = 1;
int sensorPin = A3;
int temperature = 0;


void setup() {
    analogReference(INTERNAL2V56);
    lcd.begin(16, 2);
     Serial.begin(9600);
     
   
}

void loop() {
   
   
 
   
        float temperature = 0;
        temperature = (analogRead(sensorPin) * 2.56 / 1024.0) - 0.4;
        temperature = temperature / 0.0195;
       
   
   
        delay(5000);
         Serial.print(temperature,decimalPrecision);                                                 /* display in Serial monitor the temperature in Celcius*/
            Serial.println(" T1 °C");