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Topic: RFM69HCW not found by the RadioHead library (Read 356 times) previous topic - next topic


I am currently experiencing some issues with the RFM69HCW breakout board from adafruit (https://learn.adafruit.com/adafruit-rfm69hcw-and-rfm96-rfm95-rfm98-lora-packet-padio-breakouts/overview). My wiring is the same as shown in their example: https://learn.adafruit.com/assets/40615 with the little difference that I am using an Arduino Nano instead. Furthermore I am using a slightly modified version of their code:
Code: [Select]

// rf69 demo tx rx.pde
// -*- mode: C++ -*-
// Example sketch showing how to create a simple messageing client
// with the RH_RF69 class. RH_RF69 class does not provide for addressing or
// reliability, so you should only use RH_RF69  if you do not need the higher
// level messaging abilities.
// It is designed to work with the other example rf69_server.
// Demonstrates the use of AES encryption, setting the frequency and modem
// configuration

#include <SPI.h>
#include <RH_RF69.h>

#define RFM69_CS 4
#define RFM69_INT 3
#define RFM69_RST 2
#define RF69_FREQ 433.0
// Singleton instance of the radio driver
RH_RF69 rf69(RFM69_CS, RFM69_INT);

int16_t packetnum = 0;  // packet counter, we increment per xmission

void setup()
  //while (!Serial) { delay(1); } // wait until serial console is open, remove if not tethered to computer

  pinMode(LED, OUTPUT);     
  pinMode(RFM69_RST, OUTPUT);
  digitalWrite(RFM69_RST, LOW);

  Serial.println("Feather RFM69 TX Test!");

  // manual reset
  digitalWrite(RFM69_RST, HIGH);
  digitalWrite(RFM69_RST, LOW);
  if (!rf69.init()) {
    Serial.println("RFM69 radio init failed");
    while (1);
  Serial.println("RFM69 radio init OK!");
  // Defaults after init are 434.0MHz, modulation GFSK_Rb250Fd250, +13dbM (for low power module)
  // No encryption
  if (!rf69.setFrequency(RF69_FREQ)) {
    Serial.println("setFrequency failed");

  // If you are using a high power RF69 eg RFM69HW, you *must* set a Tx power with the
  // ishighpowermodule flag set like this:
  rf69.setTxPower(20, true);  // range from 14-20 for power, 2nd arg must be true for 69HCW

  // The encryption key has to be the same as the one in the server
  uint8_t key[] = { 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08,
                    0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08};
  pinMode(LED, OUTPUT);

  Serial.print("RFM69 radio @");  Serial.print((int)RF69_FREQ);  Serial.println(" MHz");

void loop() {
  delay(1000);  // Wait 1 second between transmits, could also 'sleep' here!

  char radiopacket[20] = "Hello World #";
  itoa(packetnum++, radiopacket+13, 10);
  Serial.print("Sending "); Serial.println(radiopacket);
  // Send a message!
  rf69.send((uint8_t *)radiopacket, strlen(radiopacket));

  // Now wait for a reply
  uint8_t buf[RH_RF69_MAX_MESSAGE_LEN];
  uint8_t len = sizeof(buf);

  if (rf69.waitAvailableTimeout(500))  {
    // Should be a reply message for us now   
    if (rf69.recv(buf, &len)) {
      Serial.print("Got a reply: ");
      Blink(LED, 50, 3); //blink LED 3 times, 50ms between blinks
    } else {
      Serial.println("Receive failed");
  } else {
    Serial.println("No reply, is another RFM69 listening?");

void Blink(byte PIN, byte DELAY_MS, byte loops) {
  for (byte i=0; i<loops; i++)  {

However the rf69.init() always keeps failing. After messing around with the RadioHead library a bit, namely adding several Serial.println()s to the code, I found out that the RadioHead library was apparently not able to find a fitting device type. According to the comments in the library this means that  no device is connected. I exchanged every part of the hardware including the wiring at least one time, nothing helped. If anyone has an idea on this please tell me.


Aug 19, 2018, 06:21 pm Last Edit: Aug 19, 2018, 06:21 pm by jremington
Furthermore I am using a slightly modified version of their code
Try the unmodified version.


I just removed all their macro code determining the pins and set the pins to what they wrote in their code for my controller because I will only use the code with that. So the actual code after evaluation of the Macros will actually be the same.

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