What if you could control electrical appliances located far away without using the internet or complex wiring? With the help of LoRa communication, this becomes not only possible but also highly reliable.
In this project, we build a long-range appliance control system that allows a smartphone to send commands to devices located at a distant location.
Components Required
Arduino Nano (2 units)
Reyax RYLR999 LoRa + BLE Module (2 units)
5V Bidirectional Voltage Level Shifter (2 units)
16×2 I2C LCD Display (2 units)
2-Channel Relay Module (2 units)
Jumper Wires
USB Cable for programming
12V Power Supply
AC Bulb and 12V DC Fan (for testing loads)
Reyax RYLR999 Module Overview and Pinout
The Reyax RYLR999 module acts as the core communication unit of this system. It combines Bluetooth Low Energy and LoRa capabilities into a single device, allowing it to function as a bridge between short-range and long-range communication.
When connected to a smartphone, the module receives commands over BLE. These commands are then forwarded using LoRa to another module located at a distant point. This dual-mode operation eliminates the need for internet connectivity while still enabling remote control.
The module includes power, ground, and reset pins along with dedicated UART lines for both BLE and LoRa communication. These serial interfaces make it easy to connect the module with a microcontroller and manage bidirectional data transfer efficiently.
Project Overview / Working Principle
The system is divided into two sections: a transmitting unit and a receiving unit.
On the transmitting side, a smartphone connects to the RYLR999 module via BLE and sends control commands. The connected Arduino Nano reads these commands and forwards them through LoRa communication.
On the receiving side, another RYLR999 module captures the transmitted signal and passes it to a second Arduino. The microcontroller interprets the command and controls connected appliances using a relay module.
This approach allows reliable communication over long distances with minimal power usage, making it suitable for remote control applications.
Hardware Setup Explanation and Connections
The hardware setup consists of two similar circuits: one for sending commands and one for receiving them.
In the controller unit, the RYLR999 module is connected to the Arduino Nano using serial communication. Since the module operates at 3.3V logic levels and the Arduino works at 5V, a bidirectional level shifter is used to safely interface both devices.
BLE communication is handled through software serial pins, allowing the Arduino to manage both BLE and LoRa channels simultaneously. The I2C LCD is connected via SDA and SCL pins to display system status such as commands and responses.
On the receiver side, the setup remains mostly the same, but includes a relay module connected to digital pins of the Arduino. When a command is received, the relay switches ON or OFF the connected appliance, such as a bulb or a fan.
Proper grounding and power supply connections are essential for stable operation. The relay module ensures safe isolation between control circuitry and high-voltage loads, making the system suitable for practical deployments.
Video
Conclusion
This project highlights how LoRa technology can be used to create a reliable long-range control system without depending on internet infrastructure. By combining BLE and LoRa in a single workflow, it becomes easy to control appliances remotely using just a smartphone.
For complete step-by-step instructions and code, check the full guide here: https://playwithcircuit.com/long-range-appliance-control-from-smartphone-using-arduino/
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