How to use nRF24L01 module with Arduino

May 2, 20250 likes10 views

Learn how to wirelessly transmit sensor data using nRF24L01 and Arduino Uno. A simple project demonstrating real-time communication with DHT11 and OLED display.

The nRF24L01 is a low-cost, 2.4GHz
transceiver module used for wireless
data communication.
It communicates over the SPI protocol
and is suitable for short-range
communication.
This project demonstrates wireless data
transfer between two Arduino Uno
boards using nRF24L01 modules.
Real-time temperature and humidity
data from a DHT11 sensor is sent and
displayed on an OLED screen.
Introduction to nRF24L01
and Arduino Uno

Components
Needed
2 × Arduino Uno boards
2 × nRF24L01 modules
2 × 3.3V adapter boards
1 × DHT11 sensor
1 × 0.96" OLED display
Breadboards & jumper
wires

Understanding the
nRF24L01 Module
Operates at 2.4GHz with selectable
channels and data rates up to 2 Mbps.
Requires 3.3V power; adapter board
recommended.
Communicates via SPI: CE, CSN, SCK, MOSI,
MISO.
Ideal for low-power, high-speed
communication in IoT projects.
Transmission range up to 100 meters (line
of sight).

Wiring and Circuit
Connections
Transmitter (Sensor Side):
DHT11 connected to Arduino digital
pin.
nRF24L01 module connected via
adapter:
CE → D9, CSN → D10, MOSI → D11,
MISO → D12, SCK → D13.
Power: 3.3V to adapter (not directly to
nRF24L01).
Receiver (Display Side):
OLED (I2C) to A4 (SDA) and A5 (SCL).
nRF24L01 connected same as above.

Code
Implementation
and Working
Transmitter Code:
Uses DHT library to read sensor data.
RF24 library sends data to a defined address.
Sends temperature and humidity every second.
Receiver Code:
Constantly listens for incoming RF24 packets.
Displays received data on OLED in real time.
How It Works:
Transmitter reads from DHT11 and sends via
nRF24L01.
Receiver gets the data wirelessly and shows it on
the OLED screen.

Home automation
Wireless sensors
Remote-controlled robots.
Applications of
nRF24L01

For a more in-depth tutorial:
https://circuitdigest.com/microcontroll
er-projects/interfacing-nRF24L01-with-
arduino-uno
www.circuitdigest.com
Robotics Projects|Arduino Projects|Raspberry Pi Projects| ESP32
Projects | AI Projects | IoT Projects

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How to use nRF24L01 module with Arduino

1. Author Ankit, CircuitDigest

2. The nRF24L01 is a low-cost, 2.4GHz transceiver module used for wireless data communication. It communicates over the SPI protocol and is suitable for short-range communication. This project demonstrates wireless data transfer between two Arduino Uno boards using nRF24L01 modules. Real-time temperature and humidity data from a DHT11 sensor is sent and displayed on an OLED screen. Introduction to nRF24L01 and Arduino Uno

3. Components Needed 2 × Arduino Uno boards 2 × nRF24L01 modules 2 × 3.3V adapter boards 1 × DHT11 sensor 1 × 0.96" OLED display Breadboards & jumper wires

4. Understanding the nRF24L01 Module Operates at 2.4GHz with selectable channels and data rates up to 2 Mbps. Requires 3.3V power; adapter board recommended. Communicates via SPI: CE, CSN, SCK, MOSI, MISO. Ideal for low-power, high-speed communication in IoT projects. Transmission range up to 100 meters (line of sight).

5. Wiring and Circuit Connections Transmitter (Sensor Side): DHT11 connected to Arduino digital pin. nRF24L01 module connected via adapter: CE → D9, CSN → D10, MOSI → D11, MISO → D12, SCK → D13. Power: 3.3V to adapter (not directly to nRF24L01). Receiver (Display Side): OLED (I2C) to A4 (SDA) and A5 (SCL). nRF24L01 connected same as above.

6. Code Implementation and Working Transmitter Code: Uses DHT library to read sensor data. RF24 library sends data to a defined address. Sends temperature and humidity every second. Receiver Code: Constantly listens for incoming RF24 packets. Displays received data on OLED in real time. How It Works: Transmitter reads from DHT11 and sends via nRF24L01. Receiver gets the data wirelessly and shows it on the OLED screen.

7. Home automation Wireless sensors Remote-controlled robots. Applications of nRF24L01

8. For a more in-depth tutorial: https://circuitdigest.com/microcontroll er-projects/interfacing-nRF24L01-with- arduino-uno www.circuitdigest.com Robotics Projects|Arduino Projects|Raspberry Pi Projects| ESP32 Projects | AI Projects | IoT Projects

How to use nRF24L01 module with Arduino

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How to use nRF24L01 module with Arduino