Wireless Communication with NRF24 and Arduino Pro Micro

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Arduino Pro Micro and NRF24 modules are a great option for wireless communication. These modules offer many advantages such as low power consumption, high data rate and long distance communication.

Before you start, you need to connect Arduino Pro Micro and NRF24 modules. To connect the NRF24 module to Arduino Pro Micro, you need to make the pin connections of the module as follows:

* NRF24_CE - Arduino Pro Micro Pin 8

* NRF24_CSN - Arduino Pro Micro Pin 10

* NRF24_SCK - Arduino Pro Micro Pin 15

* NRF24_MOSI - Arduino Pro Micro Pin 16

* NRF24_MISO - Arduino Pro Micro Pin 14

* NRF24_VCC - Arduino Pro Micro 3.3V Pin

* NRF24_GND - Arduino Pro Micro GND Pin

Next, you must load the necessary libraries for NRF24 on the Arduino Pro Micro. To do this, you can use the "Add Libraries" option of the Arduino IDE and search for the "RF24" library.

After the Arduino Pro Micro and NRF24 modules are connected and the necessary libraries are loaded, you can start writing the codes. First, you must introduce the necessary libraries and pin connections.

#include <SPI.h>
#include <RF24.h>
const uint64_t pipe = 0xE8E8F0F0E1LL;
RF24 radio(8, 10);
void setup() {
Serial.begin(9600);
radio.begin();
radio.openWritingPipe(pipe);
radio.setPALevel(RF24_PA_LOW);
radio.stopListening();
}

This code makes the necessary settings to start the NRF24 module and initiates serial communication. Then you can use the following code to communicate:

void loop() {
const char text[] = "Hello, World!";
radio.write(&text, sizeof(text));

1.Project:ReceiverCircuitSetupwithNRF24andArduinoProMicro

The receiver circuit is the circuit used to receive the data sent to the transmitter circuit. You can build a receiver circuit using NRF24 and Arduino Pro Micro by following the steps below:

1. Connection: First, you need to connect the NRF24 module to Arduino Pro Micro. You can use the following pin connections for connection:

* NRF24_CE - Arduino Pro Micro Pin 8

* NRF24_CSN - Arduino Pro Micro Pin 10

* NRF24_SCK - Arduino Pro Micro Pin 15

* NRF24_MOSI - Arduino Pro Micro Pin 16

* NRF24_MISO - Arduino Pro Micro Pin 14

* NRF24_VCC - Arduino Pro Micro 3.3V Pin

* NRF24_GND - Arduino Pro Micro GND Pin

2. Libraries: Next, load the "RF24" library using the "Add Libraries" option of the Arduino IDE.

3. Code: You can write the required code for the receiver circuit as follows:

#include <SPI.h>
#include <RF24.h>
const uint64_t pipe = 0xE8E8F0F0E1LL;
RF24 radio(8, 10);
void setup() {
Serial.begin(9600);
radio.begin();
radio.openReadingPipe(1, pipe);
radio.startListening();
}
void loop() {
if (radio.available()) {
char text[32];
radio.read(&text, sizeof(text));
Serial.println(text);
}
}

This code will receive the data from the transmitter connected to the NRF24 module and display it on the Serial Monitor.

4. Upload: Finally, upload the code to Arduino Pro Micro and view the data from the transmitter on the Serial Monitor.

2.Project:Transmitter Circuit Setup with NRF24 and Arduino Pro Micro

The transmitter circuit is the circuit used to send data to the receiving circuit. You can build a transmitter circuit using NRF24 and Arduino Pro Micro by following the steps below:

1. Connection: First, you need to connect the NRF24 module to Arduino Pro Micro. You can use the following pin connections for connection:

* NRF24_CE - Arduino Pro Micro Pin 8

* NRF24_CSN - Arduino Pro Micro Pin 10

* NRF24_SCK - Arduino Pro Micro Pin 13

* NRF24_MOSI - Arduino Pro Micro Pin 11

* NRF24_MISO - Arduino Pro Micro Pin 12

* NRF24_VCC - Arduino Pro Micro 3.3V Pin

* NRF24_GND - Arduino Pro Micro GND Pin

2. Libraries: Next, load the "RF24" library using the "Add Libraries" option of the Arduino IDE.

3. Code: You can write the required code for the transmitter circuit as follows:

#include <SPI.h>
#include <RF24.h>
const uint64_t pipe = 0xE8E8F0F0E1LL;
RF24 radio(8, 10);
char data[] = "Hello World!";
void setup() {
radio.begin();
radio.openWritingPipe(pipe);
}
void loop() {
radio.write(data, sizeof(data));
delay(1000);
}

This code sends "Hello World!" to the receiver connected to the NRF24 module. It will send data continuously.

4. Upload: Finally, upload the code to Arduino Pro Micro and view the data sent to the receiving circuit.

3.Project:This project allows you to send the data collected via 2 joysticks to the receiver circuit with the NRF24 module.

You can create your project by following the steps below:

1. Ingredients:

* 2 joysticks

* 1 pc Arduino Pro Micro

* 1 NRF24 module

* Breadboard and jump wires

2. Joystick connection: X and Y axis of each joystick are connected to an analog pin.

3. Emitter circuit: Load the NRF24 and RF24 libraries for the emitter circuit in Arduino IDE and write a code like this:

#include <SPI.h>
#include <RF24.h>
const uint64_t pipe = 0xE8E8F0F0E1LL;
RF24 radio(8, 10);
int x, y;
void setup() {
radio.begin();
radio.openWritingPipe(pipe);
radio.setDataRate(RF24_250KBPS);
radio.setChannel(100);
radio.setAutoAck(false);
radio.setRetries(0, 15);

4. Receiver circuit: Load the same libraries for the receiver circuit and write the code as below:

#include <SPI.h>
#include <RF24.h>
const uint64_t pipe = 0xE8E8F0F0E1LL;
RF24 radio(8, 10);
int x, y;
void setup() {
radio.begin();
radio.openReadingPipe(1, pipe);
radio.startListening();
Serial.begin(9600);
}
void loop() {
if (radio.available()) {
int data[2];
radio.read(data, sizeof(data));
x = data[0];
y = data[1];
Serial.print("X: ");
Serial.print(x);
Serial.print(" Y: ");
Serial.println(y);
}
}

5. Upload: After uploading the codes, open the transmitter and receiver circuits and check whether the data reaches the receiver with the serial port.

What is NRF24?

NRF24 are low-cost, low-power wireless transceiver modules operating in the 2.4GHz ISM band. NRF24 is manufactured by Nordic Semiconductor and can be used with Arduino, Raspberry Pi, and other microcontrollers.

Among the features of NRF24:

* Operation in 2.4GHz ISM band

* Power saving

* Low cost

* High speed data transfer

* Energy-saving modes

* Availability of open source libraries

NRF24 is suitable for many different uses such as IoT projects, sensor networks, and wireless data transmission.

NRF24 also offers the following features:

* Three different data rate options: 250Kbps, 1Mbps, and 2Mbps

* Data packet sizes regardless of power source: 32 bytes to 32 kilobytes

* AES encryption support

* Intelligent streamlined data package structure

* Direct mode (point-to-point) and distributed mode (multi-point) communication support

* Support 6 channels dynamic frequency selection

NRF24 is also useful when transferring data between many different systems and devices is required. For example, NRF24 modules can be used to create a sensor network. Sensors can send the data they measure to a central system via NRF24 modules. The central system can also process the data and use it to make decisions when necessary.

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