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See Basic_TX.ino for a more complete example.

#include <SPI.h>
#include <NRFLite.h>

NRFLite _radio;
uint8_t _data;

void setup()
{
    _radio.init(0, 9, 10); // Set transmitter radio to Id = 0, along with the CE and CSN pins
}

void loop()
{
    _data++; // Change some data.
    _radio.send(1, &_data, sizeof(_data)); // Send to the radio with Id = 1
    delay(1000);
}

See Basic_RX.ino for a more complete example.

#include <SPI.h>
#include <NRFLite.h>

NRFLite _radio;
uint8_t _data;

void setup()
{
    Serial.begin(115200);
    _radio.init(1, 9, 10); // Set this radio's Id = 1, along with its CE and CSN pins
}

void loop()
{
    while (_radio.hasData())
    {
        _radio.readData(&_data);
        Serial.println(_data);
    }
}

• Introduction and all basic features
• 2-pin Operation and ATtiny sensor walkthrough

• Start the Arduino IDE.
• Open the Library Manager by selecting the menu item Sketch > Include library > Manage Libraries.
• Search for 'nrflite'.
• Select the latest version and click the Install button.
• View examples in the menu File > Examples > NRFLite.

• 2-pin operation on ATtiny and ATmega microcontrollers thanks to NerdRalph.
• 4-pin operation using shared CE and CSN pins while continuing to use the high-speed SPI and USI peripherals of the supported microcontrollers.
• Operation with or without interrupts using the radio's IRQ pin.
• ATtiny84/85 support when used with the MIT High-Low Tech library https://github.com/damellis/attiny. This library uses much less memory than https://github.com/SpenceKonde/ATTinyCore and is required for the ATtiny85 sensor example.
• Small number of public methods. Please see NRFLite.h for their descriptions.
• No need to enable features like retries, auto-acknowledgment packets, and dynamic packet sizes.
• No need to add delays or implement timeouts.
• No long radio addresses to manage.
• No need to set the transmit power (max is enabled by default).

• This mode is much slower than the other hookup options which take advantage of the SPI and USI peripherals of the supported microcontrollers.
• The resistor and capacitor values should only be adjusted if you have an oscilloscope and are comfortable changing the library.

Radio MISO -> Arduino 12 MISO
Radio MOSI -> Arduino 11 MOSI
Radio SCK  -> Arduino 13 SCK
Radio CE   -> Any GPIO Pin (can be same as CSN)
Radio CSN  -> Any GPIO Pin (pin 10 recommended)
Radio IRQ  -> Any GPIO Pin (optional)

Arduino Pin 10 is the SPI Slave Select (SS) pin and must stay as an OUTPUT.

Radio MISO -> Physical Pin 7
Radio MOSI -> Physical Pin 8
Radio SCK  -> Physical Pin 9
Radio CE   -> Any GPIO Pin (can be same as CSN)
Radio CSN  -> Any GPIO Pin
Radio IRQ  -> Any GPIO Pin (optional)

Arduino pin names (pictured in brown) using the MIT High-Low Tech library https://github.com/damellis/attiny.

Radio MISO -> Physical Pin 5
Radio MOSI -> Physical Pin 6
Radio SCK  -> Physical Pin 7
Radio CE   -> Any GPIO Pin (can be same as CSN)
Radio CSN  -> Any GPIO Pin
Radio IRQ  -> Any GPIO Pin (optional)

Arduino pin names (pictured in brown) using the MIT High-Low Tech library https://github.com/damellis/attiny.