Internet की ज़रूरत नहीं: 4 KM दूर तक Devices को Control करें | REYAX LoRa RYLR998 का असली Test!

byAryan Pandey -August 08, 2024

0

How to use LoRa RYLR998 Modules with Arduino

Hey Friends

⚠️ यदि आप India में इसका इस्तेमाल करना चाहते हैं तो आपको इसकी frequency बदलकर License Free ISM Band 865 - 868 MHz के बीच करनी होगी क्योंकि India में 915 MHz license free नहीं हैं |

🛒Purchase Links :

📌RYLR998 Amazon link: https://www.amazon.com/dp/B099RM1XMG

Introduction

In recent years, the concept of "smart" technology has gained significant traction, with terms like "smart cities," "smart environments," and "smart homes" becoming part of our everyday vocabulary. These innovations rely heavily on information and communication technology (ICT) to enhance operational efficiency and improve the quality of life. At the heart of these systems are IoT (Internet of Things) devices—sensors, meters, and other connected components—that gather, analyze, and utilize data to optimize infrastructure, public services, utilities, and more.

As the demand for IoT solutions continues to grow, the importance of reliable and efficient communication technologies becomes paramount. This is where LoRa (Long Range) devices come into play. LoRa technology is revolutionizing how we manage and deploy IoT networks, offering long-range communication with low power consumption. Whether it's enhancing business performance or improving daily life, LoRa devices are becoming an essential component of smart infrastructure.

In this article, we will delve into the practical application of LoRa technology, specifically focusing on the REYAX LoRa RYLR998 module. We will explore how to interface this powerful module with Arduino to create long-range, internet-independent communication systems. By the end of this guide, you'll have a solid understanding of how to leverage the RYLR998 module for your own smart projects.

Why Choose REYAX LoRa RYLR998?

Before diving into the technical details, let’s explore why the REYAX LoRa RYLR998 stands out:

Impressive Range: With a 4 km range, this module provides reliable communication over long distances.
Versatile Frequency: Operates within the 865 MHz to 868 MHz range, making it compliant with India's license-free ISM band.
No Internet Required: This module allows long-range communication without the need for an internet connection, making it perfect for remote applications.

Understanding the REYAX LoRa RYLR998 Module

Technical Specifications

Frequency Range: 865 - 868 MHz (configurable)
Transmission Power: Up to 22 dBm
Sensitivity: -138 dBm
Modulation: LoRa modulation
Communication Interface: UART (TTL Level)

Setting Parameter

Before connecting the LoRA module with Arduino, you have to set some parameters like Address, Band for the Lora module using AT commands.
First Connect the Lora module with the laptop. In the Arduino IDE select the PORT Tool–>PortOpen the Serial Monitor and set the Brud rate to 115200.
Now we can set the parameters with some basic AT commands.
First, type AT then press enter key. We should get +OK in the serial monitor.
Then type AT+ADDRESS to set the address to 0 for transmitter Lora.
Type AT+BAND to set the frequency of the wireless band.

Overview of LoRa RYLR998 Module

The RYLR998 transceiver module includes a long-range modem that gives ultra-long range spread spectrum communication and has excellent blocking immunity and high sensitivity. The module incorporates a Smart receiving power-saving mode. It is easy to control the module by AT commands. Moreover, the module contains a built-in antenna that makes it easier to send or receive the data.

Pinouts RYLR998

Pin Number	Pin Name	Description
1	Vdd	Power Supply pin
2	NRST	Active low Reset Pin
3	RXD	UART Data Input
4	TXD	UART Data Output
5	GND	Ground

LoRa RYLR998 Module with Arduino

Now, we will see how to interface the Arduino with RYLR998 LoRa Module and control the relay through that. Below are the required components, coding, circuit diagram, etc for this interfacing.

Components Required

S.no	Component	Value	Qty
1.	Lora	RYLR998	1
2.	Arduino	–	2
3.	Resistor	4.7K, 10K	1, 1
4.	LED	–	1
5.	Battery	9V	1

Circuit Diagram

Coding the REYAX LoRa RYLR998 Module

Step 1: Configuring the Module

To control an LED on the receiver side by sending a signal from the transmitter side using the REYAX LoRa RYLR998 module, you can use the following code.

Transmitter Side Code

This code will send a signal from the transmitter side to turn the LED on or off.

  
  #define ledPin 13                    // Define the pin for the LED
unsigned long lastTransmission = 0;  // Initialize lastTransmission
const int interval = 1000;           // Set the interval to 1000 ms

void setup() {
  Serial.begin(115200);              // Initialize Serial communication at 115200 baud rate
  pinMode(ledPin, OUTPUT);           // Set the LED pin as output
}

void loop() {
  // Check if the time interval has passed
  if (millis() > lastTransmission + interval) {
    Serial.println("AT+SEND=0,6,Hello!");  // Send data over LoRa

    // Blink the LED to indicate transmission
    digitalWrite(ledPin, HIGH);            // Turn the LED on
    delay(100);                            // Wait for 100 ms
    digitalWrite(ledPin, LOW);             // Turn the LED off

    lastTransmission = millis();           // Update lastTransmission to current time
  }
}
  
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Reciever Code #define ledPin 13 // Define the pin for the LED void setup() { Serial.begin(115200); // Initialize Serial communication at 115200 baud rate pinMode(ledPin, OUTPUT); // Set the LED pin as output } void loop() { // Check if there's incoming data if (Serial.available()) { String receivedData = ""; // Variable to store received data // Read the incoming data while (Serial.available()) { char incomingByte = Serial.read(); receivedData += incomingByte; } Serial.println("Received: " + receivedData); // Print the received data // Blink the LED to indicate data reception digitalWrite(ledPin, HIGH); // Turn the LED on delay(100); // Wait for 100 ms digitalWrite(ledPin, LOW); // Turn the LED off } } </span></span></h4><h4 class="wp-block-heading" style="background-color: white; border: 0px; box-sizing: inherit; color: #3a3a4a; font-family: Helvetica; font-size: 24px; font-weight: inherit; margin: 0px 0px 18px; padding: 0px; text-align: start;"><span style="font-weight: 700;"> </span><textarea cols="40" onclick="select()" readonly="" rows="5" style="height: 466px; width: 587px;">

Circuit Explanation

Transmitter Side

In the transmitter circuit, we connect the TX pin of the Lora module with the RX pin of an arduino with the help of a voltage divider. The Arduino transfers the signal at the 5V logic level but the Lora module can receive the signal at the 3.3V logic level. And therefore voltage divider is required to drop 5V to 3.3V.

Receiver Side

At the receiver Lora circuit, the TX pin of the Lora module is connected with the RX pin of an Arduino. Since Arduino has an option to receive the signal at 3.3v logic level from the LoRa module, hence doesn’t require any divider circuit.

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