Voltaat learn (http://learn.voltaat.com)
 Link for full tutorial:
 wire library:
 LiquidCrystal I2C Library:

 This is the receiver code.

 Tutorial: Transmitting Temperature and Humidity Wirelessly with HC-12

 Connections from the Arduino to the breadboard:
 • Arduino 5v pin → breadboard 5v line
 • Arduino GND pin → breadboard GND line


 Connection from the HC 12 module:
 • VCC pin → breadboard 5v line
 • GND pin → breadboard GND line
 • TX pin → Arduino pin 10
 • RX pin → Arduino pin 11

 Connections from the LCD:
 • VCC pin → breadboard 5v line
 • GND pin→ breadboard GND line
 • SDA pin→ Arduino analog pin A4
 • SCL pin → Arduino analog pin A5

*/

// Define libraries
#include "Wire.h"
#include "LiquidCrystal_I2C.h"
#include "SoftwareSerial.h"

SoftwareSerial HC12(10, 11); // RX, TX pins of HC12 module
LiquidCrystal_I2C lcd(0x27, 16, 2); // set the LCD address to 0x27 for a 16 chars and 2 line display

float lastTemperature = 0.0;
float lastHumidity = 0.0;

//Commands inside void setup run once
void setup() {
 Serial.begin(9600);
 HC12.begin(9600);
 lcd.init(); // initialize the LCD
 lcd.backlight(); // turn on the backlight

 // Print the initial labels for the temperature and humidity values
 lcd.setCursor(0, 0);
 lcd.print("Temp: ");
 lcd.setCursor(0, 1);
 lcd.print("Humidity: ");
}

//Commands inside void loop run forever
void loop() {
 if (HC12.available() > 0) {
   String message = HC12.readString();
   Serial.println(message);

   // Split the message into an array of substrings based on the comma delimiter
   char *tempString = strtok(const_cast<char*>(message.c_str()), ",");
   char *humString = strtok(NULL, ",");

   // Convert the temperature and humidity values to floats
   float temperature = atof(tempString);
   float humidity = atof(humString);

   // Only update the LCD if the temperature or humidity value has changed
   if (temperature != lastTemperature || humidity != lastHumidity) {
     // Move to the beginning of the first line
     lcd.setCursor(6, 0);

     // Clear the temperature value and print the new value
     lcd.print("    "); // Clear the space for the value
     lcd.setCursor(6, 0);
     lcd.print(temperature);
     lcd.print((char)223);
     lcd.print("C");

     // Move to the beginning of the second line
     lcd.setCursor(10, 1);

     // Clear the humidity value and print the new value
     lcd.print("       "); // Clear the space for the value
     lcd.setCursor(10, 1);
     lcd.print(humidity);
     lcd.print("%");

     // Update the last temperature and humidity values
     lastTemperature = temperature;
     lastHumidity = humidity;
   }
 }
}