Welcome to Techal, your go-to destination for all things tech! In this article, we will explore an exciting LoRa project that allows you to control appliances from a distance of 4-5 km without the need for an internet or Bluetooth connection. Moreover, you can also monitor real-time feedback on an OLED display. Let’s dive in and learn how to recreate this project.
Transmitter Circuit
The transmitter circuit, as shown in the image below, consists of a NodeMCU microcontroller and a Reyax RYLR998 LoRa module. You can easily replicate this circuit on a zero PCB or breadboard. The pushbuttons are connected to the GPIO pins and the ground pin. Additionally, two resistors act as a voltage divider to ensure the compatibility of the 5-volt logic level with the 3.3-volt Reyax Lora module.
Receiver Circuit
The receiver circuit, depicted in the image below, employs an Arduino microcontroller and a Reyax RYLR998 LoRa module. Similar to the transmitter circuit, the receiver circuit utilizes two resistors as a voltage divider. The switches are connected to digital pins and the ground pin. If preferred, you can also use pushbuttons instead of switches.
To simplify the circuit, you can use a PCB for the transmitter end Lora circuit. Visit our website Techal for the Gerber file, which you can download and order from jlcpcb. Jlcpcb also offers a free PCB assembly service, where you only need to pay for the components. By using the coupon provided in our video, you can avail yourself of this service at no additional cost.
Source Code
To make this project functional, we have provided the required source code for both the transmitter and receiver ends. The transmitter end code requires the installation of an OLED library. Additionally, you need to define the LoRa module’s band and network ID, ensuring consistency between the transmitter and receiver circuits. Moreover, you must assign unique addresses to each Lora module for communication purposes.
Feel free to explore our GitHub repository for the full source code: Techal GitHub.
FAQs
Q: Can I use a different microcontroller for this project?
A: Absolutely! While we have used NodeMCU for the transmitter circuit and Arduino for the receiver circuit, you can choose any microcontroller that suits your needs.
Q: Are the transmitter and receiver circuits compatible with different frequency bands?
A: No, both circuits must operate on the same frequency band for seamless communication. Make sure to select the appropriate band for your region.
Q: Can I control appliances using pushbuttons instead of switches?
A: Yes, the pushbuttons can be connected to the digital pins and ground pin, providing a more user-friendly interface.
Conclusion
By following our comprehensive guide, you can easily create a wireless appliance control system using LoRa technology. This project enables you to control and monitor appliances from a considerable distance without relying on the internet or Bluetooth connectivity. Stay tuned for more exciting projects on Techal, and don’t forget to subscribe and support our work on Patreon. Happy tinkering!
