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RFM69RADIO

A Node module for sending and receiving through RFM69 radios on the Raspberry Pi.

Ported from etrombly's python version of the LowPowerLab code.

Hardware

This version tested on a pair of Adafruit RFM69HCW Radios with this NodeJS code running on a Raspberry Pi 3 Model B.

The default wiring is:

RFM pin	Pi pin
3v3	17
DIO0	18 (GPIO24)
MOSI	19 (GPIO10)
MISO	21 (GPIO09)
CLK	23 (GPIO11)
CS (NSS)	24 (GPIO08 CS0)
Ground	25
RESET	29 (GPIO05)

See here for the Raspberry Pi 3 GPIO pins.

The second radio is connected to an Arduino UNO running the code in frm69_test.ino and connected according to the instrucitons from Adafruit.

Install

npm install rfm69radio

Usage

Create the module.

const RFM69 = require('rfm69radio');
const rfm69 = new RFM69();

Initialize the radio. Provide an address for the node and optionally a 16 char encryption key. Then, register callback to handle recevied packets. Then, read the temperature of the radio ic. Then, calibrate the radio. Then, send some packets.

rfm69.initialize({
  address: 1,
  // encryptionKey: '0123456789abcdef',
  verbose: false,
  powerLevelPercent: 20,
})
  .then(() => {
    console.log('Initialized');
    rfm69.registerPacketReceivedCallback(packetReceivedCallback1);
    rfm69.registerPacketReceivedCallback(packetReceivedCallback2);
    return true;
  })
  .then(() => rfm69.readTemperature())
  .then((temp) => {
    console.log(`Temp: ${temp}`);
    rfm69.calibrateRadio();
    return true;
  })
  .then(() => {
    setInterval(() => {
      const toAddress = 2;
      console.log(`Sending packet to address ${toAddress}`);
      rfm69.send({ toAddress: toAddress, payload: `Hello ${timeStamp()}`, attempts: 3, requireAck: true })
        .then((packet) => {
          console.log(`Sent on attempt ${packet.attempts} after ${packet.ackTimestamp - packet.timestamp}ms`);
          return true;
        })
        .catch(err => console.log(err));
    }, 3000);
 
    setTimeout(() => {
      rfm69.broadcast('Broadcast!!')
        .then(() => {
          console.log('Sent broadcast');
          return true;
        })
        .catch(err => console.log(err));
    }, 2000);
    return true;
  })
  .catch(err => {
    console.log(`Error initializing radio: ${err}`);
    rfm69.shutdown();
  });
 
 
function packetReceivedCallback1(packet) {
  console.log(`Packet received (callback1) from peer ${packet.senderAddress} "${packet.payload}" RSSI:${packet.rssi}`);
}
function packetReceivedCallback2(packet) {
  console.log(`Packet received (callback2) from peer ${packet.senderAddress} "${packet.payload}" RSSI:${packet.rssi}`);
} 

The initialize parameters and their defaults are:

{
        freqBand = 'RF69_915MHZ', // 'RF69_315MHZ' or 'RF69_433MHZ' or 'RF69_868MHZ' or 'RF69_915MHZ' depending on radio hardware
        address = 1, // Address for this node
        networkID = 100,
        isRFM69HW = true, // Is High Power radio? Must be true for RF69HCW, RF69HW
        powerLevelPercent = 70, // Transmit power between 0 and 100
        interruptPin = 24, // Pin number of interrupt pin. This is a GPIO number (GPIO24 = pin 18).
        resetPin = 5, // Pin number of reset pin. This is a GPIO number (GPIO5 = pin 29).
        spiBus = 0, // SPI bus number.
        spiDevice = 0, // SPI device number.
        promiscuousMode = false, // Accept all packets
        encryptionKey = 0, // Key for AES encryption. Must be 16 chars long or no encryption set
        autoAcknowledge = true, // Automatically reply with Ack
        verbose = false, // Verbose logging to console
      }

Dependencies

• GPIO access and interrupt detection: onoff
• SPI Interface: spi-device