2 layers100 × 100 mm GasGuard, the printed circuit board in 3D

GasGuard

pasinduh2002/GasGuard1

IoT and ML-based LPG monitoring system with ESP32 leak detection, automatic valve shutoff, real-time mobile alerts and refill prediction. Built with React Native, Firebase and Python.

Open in PCBKit

Size: 100 × 100 mm
Copper layers: 2
Thickness: 1.6 mm
Parts: 14
Nets: 37
Pads: 78
Tracks, vias: 178, 40
Routed: Yes
KiCad: KiCad 10.0 (file 20260206)
Created: 15 Jun 2026
Updated: 16 Oct 2026

Overview

GasGuard is an open-source printed circuit board by pasinduh2002, from the pasinduh2002/GasGuard repository on GitHub, published under the MIT licence. It is a 2-layer board of 100 × 100 mm with 14 parts on 37 nets, routed with 178 tracks and 40 vias.

It is built around the AM2302. Its parts include 8 connectors, 3 ICs and 2 resistors. It belongs with the home automation and IoT boards of this library.

Main components

AM2302
插件0%RH~99.9%RH 16bit 3.3V~5.5V 300uA Single-bus ±0.5℃ ±2%RH SIP-4 Temperature and Humidity Sensor ROHSAosong ElecTemperature And Humidity Sensor

README

README.md

🔥 GasGuard

IoT & Machine Learning-Based LPG Monitoring and Safety System

Individual Design Project · 2026

GasGuard Prototype GasGuard Mobile App

Smart Monitoring · Early Detection · Safer LPG Usage

GitHub · Watch Demo

📌 Overview

GasGuard combines ESP32 sensors, automatic valve control, Firebase, and a React Native app to monitor LPG usage, detect leaks, and predict refill dates.

✨ Features

Safety & Monitoring	Mobile & Delivery
Live LPG weight and percentage	Customer and supplier dashboards
Gas leak detection and alerts	Usage and cost tracking
Automatic valve shutoff	ML-based refill prediction
Temperature and humidity	Refill ordering and order tracking
Local LCD and buzzer alerts	Maps, location sharing, and chat

🏗️ Architecture

text

Sensors → ESP32 → Firebase → React Native App
             ↓                        ↑
      Alarm + Valve Control     ML Predictions

Leak detection and valve control operate locally without internet.

🧰 Technology Stack

🔌 Hardware

Component	Connection
ESP32 DevKit V1	Main controller
MQ-5	GPIO 34
DHT22	GPIO 27
20 kg Load Cell + HX711	DT: 25 · SCK: 26
16×2 I²C LCD	SDA: 21 · SCL: 22
MG995 Servo	GPIO 13
Buzzer	GPIO 19
Green / Red LEDs	GPIO 23 / 32
LM2596	Voltage regulation

Servo: separate regulated power line with common ground.

🚨 Leak Response

text

Gas Detected
     ↓
Red LED + Buzzer + LCD Warning
     ↓
Servo Closes Valve
     ↓
Firebase Event + Mobile Alert

🤖 Depletion Prediction

Item	Result
Model	Multiple Linear Regression
Dataset	180 records · 5 kg cylinder
Inputs	9 engineered features
Train / Test	80% / 20%
Test R²	0.9883
MAE	1.618 days
RMSE	1.877 days
5-Fold CV R²	0.9316 ± 0.1093

Inputs include LPG weight, usage rate, rolling consumption, and refill history.

Limited dataset; performance across other households and cylinder sizes is not established.

📂 Repository

text

GasGuard/
├── assets/
├── Database/
├── GasGuard_App/
├── GasGuard_App Apk/
├── GasGuard_Diagnostics_Tools/
├── GasGuard_ML/
├── NewFullcode/
├── Testing_Codes/
├── LICENSE
└── README.md

🚀 Quick Start

Firmware

Open NewFullcode/ in Arduino IDE, install dependencies, configure Wi-Fi/Firebase, and upload to ESP32.

Mobile App

bash

cd GasGuard_App
npm install
npx react-native run-android

Configure Firebase and Google Maps before running.

Machine Learning

bash

cd GasGuard_ML
pip install numpy pandas scikit-learn matplotlib
python gasguard_model_training.py

📸 Gallery

Prototype Mobile Alert Project Exhibition

🔮 Next Steps

Larger datasets and multiple cylinder sizes
Battery backup and improved weight filtering
Valve-fault monitoring
Stronger authentication and Firebase App Check
Long-term testing and delivery tracking

🔐 Security

Keep credentials out of Git. Configure Firebase Authentication, database rules, and API-key restrictions.

⚠️ Safety

Educational prototype - not a certified LPG safety system. Do not use it as a replacement for certified detectors, approved valves, or professional inspections.

👨‍💻 Developer

WALP Harsha
Electronics & Telecommunication Engineering Undergraduate
General Sir John Kotelawala Defence University · Sri Lanka 🇱🇰

📄 License

See LICENSE.

🔥 GasGuard · Smart Monitoring. Early Detection. Safer LPG Usage.

Parts

Qty	Value	Footprint	References
2	10K	Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal	R3, R4
2	Conn_01x02	Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical	J3, J4
1	AM2302	Sensor:ASAIR_AM2302_P2.54mm_Vertical	U3
1	Buzzer	Buzzer_Beeper:Buzzer_12x9.5RM7.6	BZ1
1	Conn_01x04	Connector:FanPinHeader_1x04_P2.54mm_Vertical	J7
1	Green LED	Connector_PinHeader_2.54mm:PinHeader_1x06_P2.54mm_Vertical	J8
1	I2c	Connector:FanPinHeader_1x04_P2.54mm_Vertical	J5
1	MQ5	Connector:FanPinHeader_1x04_P2.54mm_Vertical	J10
1	RED LED	Connector_PinHeader_2.54mm:PinHeader_1x06_P2.54mm_Vertical	J9
1	Servo	Connector:FanPinHeader_1x03_P2.54mm_Vertical	J6
1	YAAJ_DCDC_StepDown_LM2596	chinese:YAAJ_DCDC_StepDown_LM2596	U2
1	~	30pin:ESP32_30pin	U4

Questions

How big is the GasGuard PCB?

It measures 100 × 100 mm and has 2 copper layers, 1.6 mm thick.

What parts does the GasGuard use?

14 parts, built around the AM2302. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.

Where can I download the GasGuard KiCad files?

From the pasinduh2002/GasGuard repository on GitHub, at the commit this page was made from: the board is GasGuard_KiCAD_Files/GasGuard.kicad_pcb and its schematic GasGuard_KiCAD_Files/GasGuard.kicad_sch. PCBKit opens the board in the browser, with nothing to install.

Can I use the GasGuard design in my own project?

Its repository publishes it under the MIT licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).

Category and platform

Home automation and IoT

Project files

Show this board on your page

A live frame, for any web page

<iframe src="https://pcbkit.io/embed/boards/pasinduh2002-gasguard" title="GasGuard in PCBKit" width="100%" height="480" style="border:0;border-radius:12px" allow="fullscreen" loading="lazy"></iframe>

A picture

<img src="https://pcbkit.io/embed/boards/pasinduh2002-gasguard.jpg" alt="GasGuard" width="1200" height="900">

A picture that opens the board, for a README

[![GasGuard](https://pcbkit.io/embed/boards/pasinduh2002-gasguard.jpg?size=s)](https://pcbkit.io/boards/pasinduh2002-gasguard)

Source

Repository: pasinduh2002/GasGuard
Board file: GasGuard_KiCAD_Files/GasGuard.kicad_pcb
Commit: c2afb56
Licence: MIT

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