MQ135 Module KiCad Library

A custom KiCad library for the popular MQ135 Gas Sensor Module, including a schematic symbol, PCB footprint, and an aligned 3D model.

This library was created to make it easy to use the MQ135 module in KiCad projects without having to recreate the footprint or symbol.

---

Features

• ✅ Custom schematic symbol
• ✅ Custom PCB footprint
• ✅ Integrated 3D STEP model
• ✅ Accurate mounting holes
• ✅ Through-hole header footprint
• ✅ Fabrication (F.Fab) and Silkscreen layers
• ✅ Ready for PCB design in KiCad 9

---

Repository Structure

KiCad-MQ135-Module/
│
├── 3DModels/
│   └── MQ135_Module.step
│
├── Footprints/
│   └── MQ135_Module.pretty/
│       └── MQ135_Module.kicad_mod
│
├── Symbols/
│   └── MQ135_Module.kicad_sym
│
├── LICENSE
├── CHANGELOG.md
└── README.md

---

Pinout

Pin	Name	Description
1	VCC	Power Supply (5V)
2	GND	Ground
3	DO	Digital Output
4	AO	Analog Output

---

3D Model

The repository includes a STEP model for realistic PCB visualization inside KiCad.

---

Compatibility

• KiCad 9
• Windows, Linux, macOS

---

Installation

Symbol Library

1. Open Preferences → Manage Symbol Libraries
2. Add:

Symbols/MQ135_Module.kicad_sym

Footprint Library

1. Open Preferences → Manage Footprint Libraries
2. Add:

Footprints/MQ135_Module.pretty

3D Model

Ensure the STEP file is located in:

3DModels/MQ135_Module.step

Update the footprint's 3D model path if necessary.

---

License

This project is licensed under the MIT License.

---

Author

Mir Soleman Ali

GitHub: https://github.com/Mimo-Mir

---

Contributions

Issues, suggestions, and pull requests are welcome.