NRF905 Transceivers

Projects Networking, Protocols, and Devices
1

Hi everyone,

I recently bouth a pair of NRF905 transceivers but I'm having some difficulties to make them work.

I followed instructions from this link:

http://www.electrodragon.com/w/NRF905_Transceiver_433MHz-Wireless_Module

I've installed the library and when I try to compile any of the examples given I always get an error.

Thanks for any help!

#include <NRF905.h>
#include <SPI.h>

#define BUF_LEN          32
#define CONF_LEN         10

#define NRF905_CSN       10

unsigned char tx_buf[BUF_LEN]= "Hi, Arduino   \r\n";
unsigned char read_config_buf[CONF_LEN];

byte tx_address[4]= {0xcc,0xcc,0xcc,0xcc};

void setup()
{
    unsigned char i;
    
    pinMode(NRF905_CSN,OUTPUT); //to make sure SPI works
    
    nrf905=NRF905(NRF905_CSN);
    
    nrf905.init();


    /**
        default configuration, need to specify frequency
        choose Z-Wave frequency band, support :
        US 908.42Mhz
        EUROPE 868.42MHz
        AFRICA 868.42MHz
        CHINA 868.42MHz
        HK 919.82MHz
        JAPAN 853.42MHz
        AUSTRALIA 921.42MHz
        NEW_ZEALAND 921.42MHz
        BRASIL 921.42MHz
        RUSSIA 896MHz
    */
    nrf905.write_config(EUROPE);
 
 
    nrf905.read_config(read_config_buf);

    Serial.begin(9600);

    for(i=0; i<10; i++)
    {
        Serial.print(read_config_buf[i],HEX);
        Serial.print(' ');
    }
    
    tx_buf[12] = '0';
}

void loop()
{
    /** transmit data packet with default TX Address */
    nrf905.TX(tx_buf);
    
    /** transmit data packet with specified TX Address */
//    nrf905.TX(tx_buf, tx_address);
    
    // NOTE: TX_Address and RX_Address must be the same
    
    /** Count Sending times */
    tx_buf[12]++;
    if(tx_buf[12] == 0x3A){
      tx_buf[12] = '0';
    }
    delay(50);
}

Error:

Arduino: 1.6.4 (Windows 7), Board: "Arduino Mega or Mega 2560, ATmega2560 (Mega 2560)"

C:\Program Files (x86)\Arduino\libraries\NRF905\NRF905.cpp:16:33: error: variable 'freq_tab' must be const in order to be put into read-only section by means of '__attribute__((progmem))'
 PROGMEM unsigned int freq_tab[10] = {
                                 ^
Error compiling.

  This report would have more information with
  "Show verbose output during compilation"
  enabled in File > Preferences.
2

Have you googled that error? It, and the (trivial) solution only come up about twice a day.

3

yep...

now im trying with

but i cannot put those two guys to work.

4

in nrf905.cpp file, change the "PROGMEM unsigned int freq_tab[10] = {" to "PROGMEM const unsigned int freq_tab[10] = {"