example.c

    /*  HC12 Send/Receive Example Program 1
    By Mark J. Hughes 
    for AllAboutCircuits.com
    
    Connect HC12 "RXD" pin to Arduino Digital Pin 4
    Connect HC12 "TXD" pin to Arduino Digital Pin 5
    Connect HC12 "Set" pin to Arduino Digital Pin 6
   
    Do not power over USB.  Per datasheet, 
    power HC12 with a supply of at least 100 mA with 
    a 22 uF - 1000 uF reservoir capacitor.
    Upload code to two Arduinos connected to two computers.
    
    Transceivers must be at least several meters apart to work.
   
 */
int potPin = A0;
int value = 0;


 
#include <SoftwareSerial.h>

const byte HC12RxdPin = 4;                  // Recieve Pin on HC12
const byte HC12TxdPin = 5;                  // Transmit Pin on HC12

SoftwareSerial HC12(HC12TxdPin,HC12RxdPin); // Create Software Serial Port

void setup() {
  Serial.begin(9600);                       // Open serial port to computer
  HC12.begin(9600);                         // Open serial port to HC12
}

void loop() {
  if(HC12.available()){                     // If Arduino's HC12 rx buffer has data
    Serial.write(HC12.read());              // Send the data to the computer
    }
  if(Serial.available()){                   // If Arduino's computer rx buffer has data
    HC12.write(Serial.read());              // Send that data to serial
  }


int sensorValue = analogRead(A0); 
Serial.print (3.5);
Serial.print (" ");
Serial.print (0);
Serial.print (" ");
Serial.println(sensorValue/292);
delay(50);
}