receiver.ino

/**
 * An Arduino program that listens for messages on an RF radio and prints them
 * on the serial console.
 */

#include <SPI.h>
#include <nRF24L01.h>
#include <RF24.h>

/**
 * The pipe number to use when receiving messages from transmittors.
 */
#ifndef RECEIVER_PIPE_NO
#define RECEIVER_PIPE_NO 1
#endif

/**
 * The pipe address to use when receiving messages. Addresses are 40-bit values
 * (0x0000000000000000 - 0x000000ffffffffff).
 */
#ifndef RECEIVER_PIPE_ADDR
#define RECEIVER_PIPE_ADDR 0x0000000000000000
#endif

/**
 * A message containing sensor readings. The structure is:
 *
 *   0: A number uniquely identifying the device.
 *   1: The temperature in Kelvin.
 */
static int msg[2];

/**
 * A handle to the Bluetooth transceiver. The transceiver requires a 3.3V supply
 * voltage and is connected in the following way:
 *
 *   CE:    9
 *   CSN:  10
 *   MOSI: 11
 *   MISO: 12
 *   SCK:  13
 */
static RF24 radio(9, 10);

void setup() {
  Serial.begin(115200);

  /* Initialize the RF radio. */
  radio.begin();
  radio.openReadingPipe(RECEIVER_PIPE_NO, RECEIVER_PIPE_ADDR);
  radio.startListening();
}

void loop() {
  if (!radio.available()) {
    return;
  }

  if (!radio.read(&msg, sizeof(msg))) {
    Serial.println("Error reading payload.");
    return;
  }

  Serial.print("ID: ");
  Serial.println(msg[0]);
  Serial.print("Temperature: ");
  Serial.println(msg[1]);
}