TX-code

#include <RH_ASK.h>
#include <SPI.h> // Not actually used but needed to compile

// defines pins numbers
//transmitter needs Pin 12
#define button1   9
#define button2   10

int state1;
int state2;
const char *msg = "0";
RH_ASK driver;


void setup()
{
  Serial.begin(9600);
  pinMode(button1, INPUT);
  pinMode(button2, INPUT);
  if (!driver.init())Serial.println("init failed");
}

void loop(){
  state1 = digitalRead(button1);
  state2 = digitalRead(button2);

  if (state1 == 1) {
    send1();
  }
  else if (state2 == 1) {
    send2();
  }
  else {
    send0();
  }

}// end of Loop



void send0() {
  msg = "0";
  driver.send((uint8_t *)msg, strlen(msg));
  driver.waitPacketSent();
  delay(200);
}

void send1() {
  msg = "1";
  driver.send((uint8_t *)msg, strlen(msg));
  driver.waitPacketSent();
  delay(200);
}

void send2() {
  msg = "2";
  driver.send((uint8_t *)msg, strlen(msg));
  driver.waitPacketSent();
  delay(200);
}