Multiple Nodes nRF24L01+ Wireless Temperature DS18B20 with Arduino UNO (2 Transmitter , 1 Receiver)
Parts List
- nRF24L01+
- DS18B20 Temperature Sensor
- I2C LCD display 16×2
- Arduino UNO
- 4.7k resistor
https://www.elec-cafe.com/wp-content/uploads/2016/01/Multiple_Nodes_nRF24L01_Elec-Cafe-277x300.png 277w" sizes="(max-width: 600px) 100vw, 600px" class="clear" style="max-width: 100%; margin: 0.5em auto; display: block; height: auto; clear: both;">
Library
nRF24L01 Library
RF24 Library
DallasTemperature Library
LiquidCrystal_I2C Library
Wire Library
Wiring
Wire nRF24L01+ to Arduino UNO
GND <–> GND
VCC <–> Arduino 3.3V
CE <–> Arduino pin 9
CSN <–> Arduino pin 10
SCK <–> Arduino pin 13
MOSI <–> Arduino pin 11
MISO <–> Arduino pin 12
https://www.elec-cafe.com/wp-content/uploads/2016/01/TX1_DS18B20_ArduinoUNO_nRF24L01_Elec-Cafe-300x283.png 300w" sizes="(max-width: 517px) 100vw, 517px" class="clear" style="max-width: 100%; margin: 0.5em auto; display: block; height: auto; clear: both;">nRF24L01+ DS18B20 TX 1
https://www.elec-cafe.com/wp-content/uploads/2016/01/TX2_DS18B20_ArduinoUNO_nRF24L01_Elec-Cafe-300x283.png 300w" sizes="(max-width: 517px) 100vw, 517px" class="clear" style="max-width: 100%; margin: 0.5em auto; display: block; height: auto; clear: both;">nRF24L01+ DS18B20 TX 2
https://www.elec-cafe.com/wp-content/uploads/2016/01/RX_Multi_nRF24L01_ArduinoUNO_LCD_Elec-Cafe-300x257.png 300w" sizes="(max-width: 597px) 100vw, 597px" class="clear" style="max-width: 100%; margin: 0.5em auto; display: block; height: auto; clear: both;">nRF24L01+ RX (Multiple Nodes)
Code
Upload Code to TX 1
#include <SPI.h>
#include "nRF24L01.h"
#include "RF24.h"
#include <OneWire.h>
#include <DallasTemperature.h>
#define ONE_WIRE_BUS 2
OneWire oneWire(ONE_WIRE_BUS);
DallasTemperature sensors(&oneWire);
float temp1;
RF24 radio(9, 10);
const uint64_t pipes[3] = { 0xF0F0F0F0E1LL, 0xF0F0F0F0E2LL, 0xF0F0F0F0E3LL };
void setup(void) {
Serial.begin(9600);
sensors.begin();
radio.begin();
radio.setDataRate(RF24_250KBPS);
radio.openWritingPipe(pipes[1]);
radio.startListening();
}
void loop(void)
{
sensors.requestTemperatures();
temp1 = sensors.getTempCByIndex(0);
radio.write(&temp1, sizeof(temp1));
delay(10);
}
Upload Code to TX 2
#include <SPI.h>
#include "nRF24L01.h"
#include "RF24.h"
#include <OneWire.h>
#include <DallasTemperature.h>
#define ONE_WIRE_BUS 2
OneWire oneWire(ONE_WIRE_BUS);
DallasTemperature sensors(&oneWire);
float temp2;
RF24 radio(9, 10);
const uint64_t pipes[3] = { 0xF0F0F0F0E1LL, 0xF0F0F0F0E2LL, 0xF0F0F0F0E3LL };
void setup(void) {
Serial.begin(9600);
sensors.begin();
radio.begin();
radio.setDataRate(RF24_250KBPS);
radio.openWritingPipe(pipes[2]);
radio.startListening();
}
void loop(void)
{
sensors.requestTemperatures();
temp2 = sensors.getTempCByIndex(0);
radio.write(&temp2, sizeof(temp2));
delay(10);
}
Upload Code to RX (Multiple Nodes)
#include <SPI.h>
#include <nRF24L01.h>
#include <RF24.h>
#include <Wire.h>
#include <LCD.h>
#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x27, 2, 1, 0, 4, 5, 6, 7, 3, POSITIVE);
// Addr, En, Rw, Rs, d4, d5, d6, d7, backlighpin, polarity
float temp1, temp2;
RF24 radio(9, 10);
const uint64_t pipes[3] = { 0xF0F0F0F0E1LL, 0xF0F0F0F0E2LL, 0xF0F0F0F0E3LL };
void setup(void) {
Serial.begin(9600);
radio.begin();
radio.setDataRate(RF24_250KBPS);
radio.openReadingPipe(1, pipes[1]);
radio.openReadingPipe(2, pipes[2]);
radio.startListening();
lcd.begin(16, 2);
lcd.backlight();
lcd.clear();
lcd.print("nRF24L01+ Temp");
delay(1000);
lcd.clear();
lcd.print("Connecting.....");
delay(1000);
}
void loop(void)
{
lcd.clear();
delay(500);
if ( radio.available() )
{
delay(50);
radio.read(&temp1, sizeof(temp1));
lcd.setCursor(0, 0);
lcd.print("Temp 1");
lcd.setCursor(9, 0);
lcd.print(temp1);
lcd.print(" C");
delay(50);
radio.read(&temp2, sizeof(temp2));
lcd.setCursor(0, 1);
lcd.print("Temp 2");
lcd.setCursor(9, 1);
lcd.print(temp2);
lcd.print(" C");
}
else
{
lcd.println("No radio available");
}
delay(1000);
}
DS18B20 nRF24L01+ Temperature with LCD Display
Temp 1 amd Temp 2 on LCD Display
https://www.elec-cafe.com/wp-content/uploads/2016/01/Multi_nRF24L01_ArduinoUNO_LCD-300x225.jpg 300w" sizes="(max-width: 512px) 100vw, 512px" class="clear" style="max-width: 100%; margin: 0.5em auto; display: block; height: auto; clear: both;">
