M5Stack Cardputer Modular Expander

M5Stack Cardputer with installed modular expander

---

📷 Top view

📷 Side view

📷 Bottom view

---

📝 Project Description

The M5Stack Cardputer Modular Expander is an extension board designed to enhance the capabilities of the M5Stack Cardputer. This expander provides you oportunity to add add additional modules: WIFI external antenna, CC1101, IR Transmitter while maintaining the compact form factor of the original device.

📋 Table of Contents

• Features
• Components
• Pin Connections
• Assembly Instructions
• 3D Printing Guide
• Files
• Contributing
• License

✨ Features

• Wifi extended antenna
• CC1101
• IR transmitter

🔧 Components

Required Hardware

Component	Quantity	Notes
Ipex to sma male	1	For WIFI Antenna
2.4-GHZ sma External WIFI Antenna	1	Antenna
CC1101 433MHz module	1	without soldered pins
DS-05 flat dial switch	1	5 bit code switch 2.54mm
TSAL6400 5mm 940nm	1	IR transmitter led
LED Indicators	2	5mm 5v, two different colors

Optional Components

Component	Quantity	Notes
Protection Diodes	2	1N4148
Decoupling Capacitors	4	0.1µF ceramic

📊 Pin Connections

Below is the detailed pin connection diagram for the M5Stack Cardputer modular expander:

Detailed pin connection scheme showing GPIO, power, and communication lines

---

Note: The diagram shows the complete interconnection between the program buttons, CC1101 module, IR transmitter, and the Cardputer's main connection points.

---

🔨 Assembly Instructions

Step 1: Pulling pins from the main Cardputer board

⚠️ Required Advanced level of soldering skills!

[!TIP] Note: USE 30AWG silicon wires! if you do not have special equipment or skills for this step, you can go on any mobile repair shop and ask them. (probably cost you 10$ or free.)

Pinouts discovered by @PAZGUSTAVO

Step 2: Prepare hole for WIFI antenna

> [!IMPORTANT] > Note: You will need a 3 mm drill (depending on the thickness of the antenna cable). I do not recommend taking more than 3 mm!

Step 3: Soldering the antenna

> [!IMPORTANT] > Note: You have to cut integrated antenna, which is attached on M5StackS3.

Step 4: Bring the wires to the back panel

Step 5: Preparation CC1101

Step 6: Placing components in the extender

> [!TIP] > Note: *Picture from first assembling test* forget to take final version, it is much clear 😆

🖨️ 3D Printing Guide

Case Specifications

Printing Parameters

Parameter	Value
Material	PLA (I use) or PETG
Layer Height	0.2mm
Infill	50%
Perimeters	1
Fuzzy Skin	Outside walls
Fuzzy Shickness	0.1
Fuzzy Point	0.5
Orientation	Print flat side down

Post-Processing

1. Remove supports carefully
2. Clean up any stringing

📁 Files

Name	Download URL
Modular Expander BODY	download .stl

🤝 Contributing

Contributions are welcome! Please feel free to submit a Pull Request.

📄 License

This project is licensed under the MIT License - see the LICENSE file for details.

---

Made with ❤️ by Phon3x for M5Stack Community