====== Arduino ======
<code C>
#include <VirtualWire.h>
 
int data=10;
void setup() {
  vw_setup(2000);
  Serial.begin(9600);   // Use this for debugging
  Serial.println("Iniciando");
  delay(5000);
}
 
void loop() {
  data=data+1;
  const char *msg = "pp"; 
  vw_send((uint8_t *)msg, sizeof(msg)); 
  vw_wait_tx();
  Serial.println(msg);
  delay(2000); 
}
</code>

Convirtiendo uint8 a char
<code c>
#include <VirtualWire.h>
 
uint8_t data=10;
void setup() {
  vw_setup(1000);
  Serial.begin(9600);   // Use this for debugging
  Serial.println("Iniciando");
  delay(5000);
}
String converter(uint8_t num){
    char cv[2];
    num=num;
    cv[0]=(num/10)%10+48;
    cv[1]=num%10+48;  
    Serial.print(cv[0]);Serial.println(cv[1]);
    return String((char *)cv);
}
 
void loop() {
  data=data+1;

  String tempo;
  tempo=converter(data);
  const char *msg = tempo.c_str(); 
  vw_send((uint8_t *)msg, sizeof(msg)); 
  vw_wait_tx();
  Serial.print(data);Serial.print("-");Serial.println(msg);
  delay(2000); 
}
</code>

====== Raspberry ======
Instalar 
<code bash>
sudo apt-get install pigpio python-pigpio python3-pigpio
</code>
Iniciar el servicio 
<code bash>
sudo systemctl  status pigpiod.service
sudo systemctl  start pigpiod.service
sudo systemctl  status pigpiod.service
</code>
Conectar el reciever 433 en los pines:
  - VCC pin 2 - 5V
  - GND Pin 12 - GND
  - DATA pin 38 - GPIO20
{{ :proyectos:raspberry-pi-gpio-layout-model-b-1024x341.png |}}
Descargar la libreria [[http://abyz.me.uk/rpi/pigpio/code/vw.zip|VirtualWire para python]], descomprimirla, creando el archivo siguiente recibir.py

<code python>
#!/usr/bin/env python
import time
import pigpio
import vw

RX=20

BPS=2000

pi = pigpio.pi() # Connect to local Pi.

rx = vw.rx(pi, RX, BPS) # Specify Pi, rx GPIO, and baud.
msg = 0

start = time.time()

while (time.time()-start) < 300:
  msg += 1

  while rx.ready():
     print("Leyendo "+str(msg/10000)+":")
     print("".join(chr (c) for c in rx.get()))

rx.cancel() # Cancel Virtual Wire receiver.
pi.stop() # Disconnect from local Pi.

</code>

Ejecutar 
<code bash>
python recibir.py
</code>
====== Referencias ======
  * http://abyz.me.uk/rpi/pigpio/examples.html#Python_vw
  * http://abyz.me.uk/rpi/pigpio/#Type_3
  * https://github.com/DzikuVx/piVirtualWire
  * https://quadmeup.com/virtualwire-support-for-raspberry-pi/
  * https://forums.raspberrypi.com/viewtopic.php?t=84596
  * https://n8henrie.com/2015/03/range-testing-for-wireless-arduino-projects-rf-433-mhz-and-nrf24l01/