Category:NRF24

Features

The Nordic Semiconductor nRF24L01 is descended from the TXRX24G, but it offers some important features that make it much easier to deal with:

• Enhanced Shockburst™: This is Nordic’s link layer protocol that gives the radio auto-acknowledgement, auto-retransmit, and packet loss detection capability. It will make the wireless link much more reliable without adding complexity to the students’ application programs.
• SPI bus: The nRF24L01 implements a 4-wire Serial Peripheral Interface bus. This allows the software driver to use the microcontroller’s native high speed SPI module for communications instead of having to do manual bit bashing, which is less reliable, slower, and more difficult to implement.
• External antenna: This should improve the new radio’s sensitivity and range over those of the old radios.
• MultiCeiver™: Each radio can receive packets on up to six different addresses. This allows us to implement features such as selective packet broadcasting without sacrificing other functionality.

Other features: Variable packet widths, packet queueing, ack packet payload, etc.

Module pin definition, board schematic

• 

  pin definition

• 

  Board and pin outs for NRF24L01B

• 

  module schematic

Dimension, Schematic

• 

  NRF24L01L

• 

  NRFduino - dimension

• 

  NRFduino - schematic keeps updating, reference only

• 

  STC15L204 TTL UART Board

• 

  STM8 TTL UART Board

• NRF24Duino pin definition

Pins	Configuration
D2 via Jumper	Nrf24l01 - IRQ interrupt
D7	Nrf24l01 - enable pin (EN or CE)
D8	SPI Flash - chip slect pin(CS)
D9 via Jumper	On-board testing LED
D10	Nrf24l01 - chip select pin(CS or SS)
D11-D13	Nrf24l01 and SPI Flash - SPI pins

Other Boards (reference only)

XL24LE1

• Dev Board Schematic
• NRF24LE1 Specification

NRF24L01 with MCU USB Control

AT+SET=00,12,34,56,78,90,27

Section	Header text	Header text
1	00	frequency
2	12	Register to setup power rate and serial port baud rate
3-7	34,56,78,90,27	Example

NRF24L01 with STC C51 MCU

STC15L204EA +NRF24L01 Schematic

Demo Code of STC51 Usage Connect board RX to TX (MCU,PC), and board TX to RX(MCU,PC)
Simply use a UART connector (PL2303, FT232RL, CP2102, etc) to connector between PC and this module.

• To upload C51 demo code, notice the MCU frequency, for default button pressed frequency is 22.1184 mhz, and data transmission demo code frequency is 18.xx Mhz

Testing Methods

• In this case you don't need connect with any UART and go to PC
• Prepare two pairs, all power up normally:
• One pair of TX and RX connect to LEDs, and LEDs goes to VCC.
• The TX (Or RX) in another pair should shortly connect to GND
• Now the LEDs will start to blinking which means both works well
• Try to further adapt the demo code for your projects

Serial to NRF24L01

Command	Example	Parameters	Default
baudrate	AT+BAUD=7 set to 115200	Example	9600
Air speed	AT+RATE=1	250kbps, 1Mbps, 2Mbps	2Mbps
Set Target Receiver module address	AT+RXA=0xAA,0xBB,0xCC,0xDD,0xEE	-	0xFF,0xFF,0xFF,0xFF,0xFF
Set local transmitter address	AT+TXA=0xAA,0xBB,0xCC,0xDD,0xEE	-	0xFF,0xFF,0xFF,0xFF,0xFF
Set channel	AT+FREQ=2.424G	-	2.4GHz
CRC check	AT+CRC=8	8 or 16	2.4GHz
System enquiry	AT?	-	-

Documents

Title	Type
File:NRF24L01P Product Specification 1 0.pdf	Documents
Radiohead	Arduino library
tmrh20 - RF24, recommanded	Arduino library
RF24, RF24 v1	Arduino library
Mirf	Arduino library
Mysensors, instruction	Arduino library
AVRlib	Arduino port

Documents

• Nrf24l01-mirf wiki page
• Arduino documents for nrf24l01
• Other demo code for atmega16, stc89, etc see on this page.