Arduino SX1278 Lora based Two Way communication System

(Last Updated On: October 12, 2021)

Arduino SX1278 Lora, Description:

Arduino SX1278 Lora

Arduino SX1278 Lora based Two Way communication- In my previous getting started tutorial on the Arduino and SX1278 Lora transceiver modules, I explained the maximum basic things including the SX1278 Lora module Pinout, technical specifications, and it’s interfacing with the Arduino. I demonstrated two beginners level projects. The Hello World project in which I was simply sending the Hello World message wirelessly to the receiver Lora module and then in the next example I modified the same program and converted it into a sensor monitoring system. So, if you are a beginner then I highly recommend you should first read my getting started tutorial on the Arduino and SX1278 Lora modules.

Arduino SX1278 Lora



In this tutorial, you will learn how to make a wireless two way communication system using Arduino and SX1278 Lora Transceiver modules. To the Master Node a Potentiometer is connected which I am using as a sensor. While to the Slave Node a Push Button and Oled display modules are connected. The value of the potentiometer is sent from the Master Node to the Slave Node and is displayed on the Oled display module. You can replace the potentiometer with any other analog sensor or you can use other digital sensors.

Arduino SX1278 Lora

The button status information from the Slave Node is sent to the Master Node and the message is displayed on the Serial Monitor. Don’t get confused when I say Master Node and Slave Node. The reason I am using these names is that in the upcoming article, I will make a network in which the Master Node will request data from the multiple Slave Nodes. Anyways, it’s a complete two-way communication system based on the Arduino and the most powerful and popular 433MHz SX1278 Lora Transceiver modules. Now, you have got the idea of what you are going to learn after reading this article. Without any further delay, let’s get started!!!

Read my new article on Multiple Lora Nodes communication with the Master Lora Node.


Amazon Links:

LoRa SX1278 Module

Arduino Nano

Arduino Uno

SSD1306 128×64 Oled i2c display Module

Other Tools and Components:

Top Arduino Sensors:

Super Starter kit for Beginners

Digital Oscilloscopes

Variable Supply

Digital Multimeter

Soldering iron kits

PCB small portable drill machines

*Please Note: These are affiliate links. I may make a commission if you buy the components through these links. I would appreciate your support in this way!



Arduino SX1278 Lora Master Node Circuit:

Arduino SX1278 Lora

This is the circuit diagram of the Master Node, the connection of the SX1278 Lora module and Potentiometer remains exactly the same. The VCC of the LoRa module is connected with the 3.3V of the Arduino. The MISO Pin of the LoRa module is connected with the Arduino’s pin 12. The MOSI pin is connected with the Arduino’s pin 11. The SCLK pin of the LoRa module is connected with the Arduino’s pin 13. The NSS pin is connected with the Arduino’s pin 10 and the ground pin of the LoRa module is connected with the Arduino’s GND. The same connections we will also need on the receiver side. 


Arduino SX1278 Lora Slave Node Circuit:

Arduino SX1278 Lora

This is the circuit diagram of the Slave Node. The connection of the SX1278 Lora module remains exactly the same. The Pushbutton is connected with the digital pin 3 of the Arduino. The VCC and GND pins of the SSD1306 Oled display module are connected with the Arduino’s 3.3V and GND pins. The SDA and SCL pins of the Oled display module are connected with the Arduino’s I2C pins A4 and A5.

I connected everything as per the circuit diagrams. So, the Arduino to which the potentiometer is connected is the Master Node, and the Arduino to which the Push Button and Oled display module are connected is the Slave Node.


Programming:

Before, you start the programming first of all; make sure you download all the necessary.

Download: LoRa.h

Download: Adafruit_GFX.h

Download: Adafruit_SSD1306.h

Arduino SX1278 Lora Master Node Code:


Arduino SX1278 Lora Slave Node Code:

As you can see both the programs are almost identical. The Sending and receiving codes on both the sides are exactly the same. There are just a few changes. As you can see the Master node has the potentiometer while the Slave node has the push button and also an Oled display module. Maximum of the code I have already explained in my previous tutorial.



Watch Video Tutorial:

 

Recommended For You

About the Author: Engr Fahad

My name is Shahzada Fahad and I am an Electrical Engineer. I have been doing Job in UAE as a site engineer in an Electrical Construction Company. Currently, I am running my own YouTube channel "Electronic Clinic", and managing this Website. My Hobbies are * Watching Movies * Music * Martial Arts * Photography * Travelling * Make Sketches and so on...

Leave a Reply

%d bloggers like this: