Setting TX power and frequency on nRF905

Using Arduino Programming Questions
1

I need some guidance on this to make sure I'm doing it right, here is my code edited so far. I used a github library found here:

I used the example server/client ping to test that I could link two arduinos via nRF905 transmitters and they communicate just fine. However, I think the default for this transmitter is 433MHz, not the 915MHz that I want. I also want to max the power at 10mW so I edited a couple of lines to attempt to do this. Here is my code, it compiles fine, I just want to make sure I set it correctly. Thanks for the help!

/*
 * Project: nRF905 AVR/Arduino Library/Driver
 * Author: Zak Kemble, contact@zakkemble.co.uk
 * Copyright: (C) 2013 by Zak Kemble
 * License: GNU GPL v3 (see License.txt)
 * Web: http://blog.zakkemble.co.uk/nrf905-avrarduino-librarydriver/
 */

/*
 * Time how long it takes to send some data and get a reply
 * Should be around 14-16ms with default settings.
 *
 * 7 -> CE
 * 8 -> PWR
 * 9 -> TXE
 * 2 -> CD
 * 3 -> DR
 * 10 -> CSN
 * 12 -> SO
 * 11 -> SI
 * 13 -> SCK
 */

#include <nRF905.h>
#include <SPI.h>

#define RXADDR {0xFE, 0x4C, 0xA6, 0xE5} // Address of this device (4 bytes)
#define TXADDR {0x58, 0x6F, 0x2E, 0x10} // Address of device to send to (4 bytes)
#define FREQUENCY     nRF905_915MHZ
#define TIMEOUT 1000 // 1 second ping timeout


#define POWER  nRF905_pwr_t 10

void setup()
{
	// Start up
	nRF905_init();


	// Set address of this device
	byte addr[] = RXADDR;
	nRF905_setRXAddress(addr);

	// Put into receive mode
	nRF905_receive();

	Serial.begin(9600);
	
	Serial.println(F("Client started"));
}

void loop()
{
	static byte counter;

	// Make data
	char data[NRF905_MAX_PAYLOAD] = {0};
	sprintf(data, "test %hhu", counter);
	counter++;

	unsigned long startTime = millis();

	// Set address of device to send to
	byte addr[] = TXADDR;
	nRF905_setTXAddress(addr);

	// Set payload data
	nRF905_setData(data, sizeof(data));

	// Send payload (send fails if other transmissions are going on, keep trying until success)
	while(!nRF905_send());

	// Put into receive mode
	nRF905_receive();

	// Make buffer for reply
	byte buffer[NRF905_MAX_PAYLOAD];
	bool success;

	// Wait for reply with timeout
	unsigned long sendStartTime = millis();
	while(1)
	{
		success = nRF905_getData(buffer, sizeof(buffer));
		if(success)// Got data
			break;

		// Timeout
		if(millis() - sendStartTime > TIMEOUT)
			break;
	}

	if(success)
	{
		unsigned int totalTime = millis() - startTime;
		Serial.print(F("Ping time: "));
		Serial.print(totalTime);
		Serial.println(F("ms"));

		// Printout ping contents
		Serial.print(F("Data from server: "));
		Serial.write(buffer, sizeof(buffer));
		Serial.println();
	}
	else
		Serial.println(F("Ping timed out"));

	delay(1000);
}

All I added was:
#define FREQUENCY nRF905_915MHZ
#define POWER nRF905_pwr_t 10

Bob

2

All I added was:

#define FREQUENCY     nRF905_915MHZ

#define POWER  nRF905_pwr_t 10

How is the library supposed to know you did that?

3

I realize that all I did was define them and not actually set anything. I'm going to attempt to define them properly today and incorporate it in the code. I will update this afterwards and hopefully it will actually do what I mean for it to.

Bob