How to use nRF24L01 module with Arduino?

This wireless data transmission project is split into two separate systems: a transmitter node and a receiver node. On the transmitter side, an Arduino Uno is connected to a DHT11 sensor, which measures environmental temperature and humidity. The Arduino reads these digital sensor values and prepares them for wireless transmission. To send the data through the air, the Arduino uses the SPI communication bus to interface with an nRF24L01 wireless transceiver module mounted on a dedicated 3.3V adapter board. The nRF24L01 module broadcasts the sensor packet across the 2.4GHz radio frequency band. On the receiver side, a second Arduino Uno equipped with an identical nRF24L01 transceiver and adapter board listens for the incoming radio signal. Once the receiver captures the data packet, the Arduino processes the temperature and humidity information and outputs it visually onto an attached OLED display using jumper wires and a breadboard. Power management is critical in this setup; while the Arduino Uno operates at 5V logic, the nRF24L01 radio requires a stable 3.3V power supply, which is safely delivered by the adapter boards.