nRF24L01+

The nRF24L01+ is a single chip 2.4GHz transceiver with an embedded baseband protocol engine (Enhanced ShockBurst™), suitable for ultra low power wireless applications.
Looking in eBay I found the nRF24L01+ in three different modules. I bought the smd module, but for testing is better the module with pin header.  

Description of library.

Initializes the nRF24L01 module.

NRF24L01_Init(mode, rf_channel)

• mode: Sets RX_MODE or TX_MODE.
• rf_channel: Sets the channel to be used.

Example:

NRF24L01_Init(TX_MODE, 0x20);

Sends a data from Transmitter to Receiver. 

NRF24L01_SendData(buffer)

• buffer: Data to be sent.

Example:

unsigned char data[32] = {'P', 'I', 'C', '1', '8', 'F', '4', '5', '5', '0'};

NRF24L01_SendData(data);

Reads the interrupt.

NRF24L01_DataReady(void)

This function reads the STATUS and returns a 0 logic if the receiver got a new data.

• return 0: When is available  a data.
• return 1: When  isn't available a data.

Example:

while(NRF24L01_DataReady()){}

Reads a data received from transmitter. 

NRF24L01_ReadData(buffer)

• buffer: Saves the data received. 

Example:

unsigned char buffer1[32];
while(NRF24L01_DataReady()){}
NRF24L01_ReadData(buffer1);

Sets the nRF24L01 as RX or TX mode.
NRF24L01_SetMode(mode)

• mode: Sets RX_MODE or TX_MODE.

Example:
NRF24L01_SetMode( RX_MODE);
 

Sets a channel.
NRF24L01_SetChannel(rf_channel)

• rf_channel: Sets a new channel.

Example:
NRF24L01_SetChannel(0x45);

Gets the channel used. 
NRF24L01_GetChannel(void) 

• return the channel used.

Example:
unsigned char channel;
channel = NRF24L01_GetChannel();

Example 1. Simplex communication.

This video shows a system simplex, where the transmitter sends a byte to receiver. The receiver gets the byte and set the value binary at the PORTB.

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