Arduino

#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); 
}

Convirtiendo uint8 a char

#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); 
}

Raspberry

Instalar

sudo apt-get install pigpio python-pigpio python3-pigpio

Iniciar el servicio

sudo systemctl  status pigpiod.service
sudo systemctl  start pigpiod.service
sudo systemctl  status pigpiod.service

Conectar el reciever 433 en los pines:

VCC pin 2 - 5V
GND Pin 12 - GND
DATA pin 38 - GPIO20

Descargar la libreria VirtualWire para python, descomprimirla, creando el archivo siguiente recibir.py

#!/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.

Ejecutar

python recibir.py

Tabla de Contenidos

Arduino

Raspberry

Referencias