//***************************Master or Receiver code*****************
/*This code was used for a video tutorial on the ForceTronics YouTube Channel
* This code is free and open for anybody to use and modify at your own risk
*/
#include <SPI.h> //Call SPI library so you can communicate with the nRF24L01+
#include <nRF24L01.h> //nRF2401 libarary found at https://github.com/tmrh20/RF24/
#include <RF24.h> //nRF2401 libarary found at https://github.com/tmrh20/RF24/
const uint8_t pinCE = 9; //This pin is used to set the nRF24 to standby (0) or active mode (1)
const uint8_t pinCSN = 10; //This pin is used for SPI comm chip select
RF24 wirelessSPI(pinCE, pinCSN); // Declare object from nRF24 library (Create your wireless SPI)
const uint64_t rAddress = 0xB00B1E50C3LL; //Create pipe address for the network and notice I spelled boobies because I am mature, the "LL" is for LongLong type
const uint8_t rFChan = 89; //Set channel frequency default (chan 84 is 2.484GHz to 2.489GHz)
//Create a structure to hold fake sensor data and channel data
struct PayLoad {
uint8_t chan;
uint8_t sensor;
};
PayLoad payload; //create struct object
void setup() {
wirelessSPI.begin(); //Start the nRF24 module
wirelessSPI.setChannel(rFChan); //set communication frequency channel
wirelessSPI.openReadingPipe(1,rAddress); //This is receiver or master so we need to be ready to read data from transmitters
wirelessSPI.startListening(); // Start listening for messages
Serial.begin(115200); //serial port to display received data
Serial.println("Network master is online...");
}
void loop() {
if(wirelessSPI.available()){ //Check if recieved data
wirelessSPI.read(&payload, sizeof(payload)); //read packet of data and store it in struct object
Serial.print("Received data packet from node: ");
Serial.println(payload.chan); //print node number or channel
Serial.print("Node sensor value is: ");
Serial.println(payload.sensor); //print node's sensor value
Serial.println();
}
}
//***************************Node or Transmitter code*****************
/*This code was used for a video tutorial on the ForceTronics YouTube Channel
* This code is free and open for anybody to use and modify at your own risk
*/
#include <SPI.h> //Call SPI library so you can communicate with the nRF24L01+
#include <nRF24L01.h> //nRF2401 libarary found at https://github.com/tmrh20/RF24/
#include <RF24.h> //nRF2401 libarary found at https://github.com/tmrh20/RF24/
const uint8_t pinCE = 9; //This pin is used to set the nRF24 to standby (0) or active mode (1)
const uint8_t pinCSN = 10; //This pin is used to tell the nRF24 whether the SPI communication is a command
RF24 wirelessSPI(pinCE, pinCSN); // Declare object from nRF24 library (Create your wireless SPI)
const uint64_t wAddress = 0xB00B1E50C3LL; //Create pipe address to send data, the "LL" is for LongLong type
const uint8_t rFChan = 89; //Set channel default (chan 84 is 2.484GHz to 2.489GHz)
const uint8_t rDelay = 7; //this is based on 250us increments, 0 is 250us so 7 is 2 ms
const uint8_t rNum = 5; //number of retries that will be attempted
const uint8_t chan1 = 2; //D2 pin for node channel check
const uint8_t chan2 = 3; //D3 pin for node channel check
const uint8_t chan3 = 4; //D4 pin for node channel check
//stuct of payload to send fake sensor data and node channel
struct PayLoad {
uint8_t chan;
uint8_t sensor;
};
PayLoad payload; //create struct object
void setup() {
pinMode(chan1,INPUT_PULLUP); //set channel select digital pins to input pullup
pinMode(chan2,INPUT_PULLUP);
pinMode(chan3,INPUT_PULLUP);
wirelessSPI.begin(); //Start the nRF24 module
wirelessSPI.setChannel(rFChan);
wirelessSPI.setRetries(rDelay,rNum); //if a transmit fails to reach receiver (no ack packet) then this sets retry attempts and delay between retries
wirelessSPI.openWritingPipe(wAddress); //open writing or transmit pipe
wirelessSPI.stopListening(); //go into transmit mode
randomSeed(analogRead(0)); //set random seed for fake sensor data
setChannel(); //checks current channel setting for transceiver
}
void loop() {
delay(3000); //send data every 3 seconds
payload.sensor = random(0,255); //get made up sensor value
if (!wirelessSPI.write(&payload, sizeof(payload))){ //send data and remember it will retry if it fails
delay(random(5,20)); //as another back up, delay for a random amount of time and try again
if (!wirelessSPI.write(&payload, sizeof(payload))){
//set error flag if it fails again
}
}
}
//check for low digital pin to set node address
void setChannel() {
if(!digitalRead(chan1)) payload.chan = 1;
else if(!digitalRead(chan2)) payload.chan = 2;
else if(!digitalRead(chan3)) payload.chan = 3;
else payload.chan = 0;
}
