Specifications:

• 4-pin Serial Peripheral Interface (SPI)
• maximum data rate of 10Mbps
• 125 selectable channels
• output power (0 dBm, -6 dBm, -12 dBm or -18 dBm) can be configured through the SPI interface
• data rate (250kbps, 1Mbps, or 2Mbps) can be configured through the SPI interface

Transmitter code:

#include <SPI.h>
#include <nRF24L01.h>
#include <RF24.h>
RF24 radio(9, 10);  // CE, CSN
const byte address[6] = "00001";
void setup()
{
  radio.begin();
  radio.openWritingPipe(address);
  radio.stopListening();
}
void loop()
{
  const char text[] = "TESTING 1 2 3, TESTING"; //message
  radio.write(&text, sizeof(text));
  delay(1000);
}

Receiver code:

#include <SPI.h>
#include <nRF24L01.h>
#include <RF24.h>
RF24 radio(9,10);  // CE, CSN
const byte address[6] = "00001";
void setup()
{
  while (!Serial);
    Serial.begin(9600);
  radio.begin();
  radio.openReadingPipe(0, address);
  radio.startListening();
}
void loop()
{
  if (radio.available())
  {
    char text[32] = {0};
    radio.read(&text, sizeof(text));
    Serial.println(text);
  }
}

This sensor is available in a waterproof version for outdoor use.

/* DS18B20 1-Wire digital temperature sensor with Arduino example code. More info: https://www.makerguides.com */
// Include the required Arduino libraries:
#include <OneWire.h>
#include <DallasTemperature.h>
// Define to which pin of the Arduino the 1-Wire bus is connected:
#define ONE_WIRE_BUS 2
// Create a new instance of the oneWire class to communicate with any OneWire device:
OneWire oneWire(ONE_WIRE_BUS);
// Pass the oneWire reference to DallasTemperature library:
DallasTemperature sensors(&oneWire);
void setup() {
  // Begin serial communication at a baud rate of 9600:
  Serial.begin(9600);
  // Start up the library:
  sensors.begin();
  sensors.setResolution(12);  // 750 ms
}
void loop() {
  // Send the command for all devices on the bus to perform a temperature conversion:
  sensors.requestTemperatures();
  // Fetch the temperature in degrees Celsius for device index:
  float tempC = sensors.getTempCByIndex(0); // the index 0 refers to the first device
  // Fetch the temperature in degrees Fahrenheit for device index:
  float tempF = sensors.getTempFByIndex(0);
  // Print the temperature in Celsius in the Serial Monitor:
  Serial.print("Temperature: ");
  Serial.print(tempC);
  Serial.print(" \xC2\xB0"); // shows degree symbol
  Serial.print("C  |  ");
  // Print the temperature in Fahrenheit
  Serial.print(tempF);
  Serial.print(" \xC2\xB0"); // shows degree symbol
  Serial.println("F");
  // Wait 1 second:
  delay(1000);
}

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