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