Project Hydra Meshtastic Pcb

A minimalist 1W LoRA PCB design for Meshtastic-device firmware

Internet of Things (IoT)Multi-languageGPL-3.0

Abstract

Project Hydra Meshtastic Pcb is an open-source Internet of Things (IoT) project. A minimalist 1W LoRA PCB design for Meshtastic-device firmware. A minimalist PCB design built around the Ebyte E22-900M30S 30dbm (1 watt) LoRA radio and the ESP32-WROOM-32U cpu compatible with the Meshtastic-device firmware. It is built using ESP32. Key capabilities include: Supports up to 30dbm (1 watt) transmit power (Please check local ISM band regulations for power limitations); OLED support via I2C; GPS support via UART. The complete source code is publicly available on GitHub under the GNU General Public License v3.0, making it a useful reference for students building an Internet of Things (IoT) mini project or final-year project.

1. Introduction

A minimalist PCB design built around the Ebyte E22-900M30S 30dbm (1 watt) LoRA radio and the ESP32-WROOM-32U cpu compatible with the Meshtastic-device firmware.

2. Objective

A minimalist 1W LoRA PCB design for Meshtastic-device firmware

This project demonstrates how ESP32 can be applied to a real-world Internet of Things (IoT) problem.

3. Key Features / Modules

  • Supports up to 30dbm (1 watt) transmit power (Please check local ISM band regulations for power limitations)
  • OLED support via I2C
  • GPS support via UART
  • PSRAM support
  • User button via pin header
  • Switchable 3.3V power rail (GPS power saving)
  • ADC input for battery voltage sensing
  • Single 5V input (no reverse polarity and overvoltage protection!)
  • 3.3V output (or input if onboard buck converter is not assembled)
  • Two GPIO reserved for future use (for example power control)

4. Technology Stack

ESP32

5. System Requirements

General requirements for this technology stack — check the README for exact versions.

  • See the project README for exact requirements
  • Git (to clone the repository)

6. Installation & Setup

git clone https://github.com/Hydra-Designs/project-hydra-meshtastic-pcb.git
cd project-hydra-meshtastic-pcb

Full setup instructions are in the project README.

7. Future Enhancements

Suggested extensions you can add to make this your own project.

  • Add a mobile dashboard using Blynk or Firebase
  • Store readings in a cloud database for history charts
  • Add alerts via SMS / Telegram when thresholds are crossed

8. Viva / Review Questions

Common questions examiners ask for projects in this domain.

  1. Which microcontroller / board and sensors are used and why?
  2. How does the device send data (Wi-Fi, MQTT, HTTP, Bluetooth)?
  3. Where is the sensor data stored and visualised?
  4. How is power consumption managed?
  5. How would you secure the device and its communication?

9. Source Code & License

This project is developed by Hydra-Designs and published on GitHub under the GNU General Public License v3.0. Please follow the license terms and credit the original author when you use or modify this code.

View Source on GitHubDownload ZIP

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