rpi-433

Simple NodeJS module to send and receive decimal codes through 433Mhz device on RaspberryPI 2

Dependencies

• wiringPi : https://projects.drogon.net/raspberry-pi/wiringpi/

Building WiringPi

pi@raspberrypi ~ $ git clone git://git.drogon.net/wiringPi
...
pi@raspberrypi ~ $ cd wiringPi/wiringPi
pi@raspberrypi ~/wiringPi/wiringPi $ sudo su
...
root@raspberrypi:/home/pi/wiringPi/wiringPi# ./build

Installation

npm install rpi-433

Usage

Firstly, make sure you are running your application as root or with sudo, else the Raspberry Pi will not let you output/input to the GPIO and you'll get an error.

sudo node myscript.js

Please note that there are different and confusing ways to reference a channel. This module supports wPi schema. Once wiringPi is installed, in your CLI you can run gpio readall and check the wPi column or consult https://projects.drogon.net/raspberry-pi/wiringpi/pins/

gpio readall

Example

var rpi433    = require('rpi-433'),
    rfSniffer = rpi433.sniffer({
      pin: 2,                     //Snif on GPIO 2 (or Physical PIN 13)
      debounceDelay: 500          //Wait 500ms before reading another code
    }),
    rfEmitter = rpi433.emitter({
      pin: 0,                     //Send through GPIO 0 (or Physical PIN 11)
      pulseLength: 350            //Send the code with a 350 pulse length
    });

// Receive (data is like {code: xxx, pulseLength: xxx})
rfSniffer.on('data', function (data) {
  console.log('Code received: '+data.code+' pulse length : '+data.pulseLength);
});

// Send
rfEmitter.sendCode(1234, function(error, stdout) {   //Send 1234
  if(!error) console.log(stdout); //Should display 1234
});

/* Or :

rfEmitter.sendCode(code);
rfEmitter.sendCode(code, {  //You can overwrite defaults options previously set (only for this sent)
  pin: 2,
  pulseLength: 350
});
rfEmitter.sendCode(code, callback);
rfEmitter.sendCode(code, {
  pin: 2,
  pulseLength: 350
}, callback);
*/

//rpi-433 uses the kriskowal's implementation of Promises so,
//if you prefer Promises, you can also use this syntax :
rfEmitter.sendCode(1234, {pin: 0})
  .then(function(stdout) {
    console.log('Code sent: ', stdout);
  }, function(error) {
    console.log('Code was not sent, reason: ', error);
  });