2 layers116.8 × 30 mm
Type d
google/mozc-devices
Circuit diagrams and firmware source code for Gboard DIY keyboards
14 parts3kApache-2.0
2 layers35 × 50 mm
TouchCard
urjadoshi2024etc-creator/PinFlow-HubThe official resource hub for PinFlow Hub. 🚀 Open-source schematics, PCB designs, and firmware for my E&TC engineering projects. Bridging the gap between theory and hardware.
- Size
- 35 × 50 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 14
- Nets
- 7
- Pads
- 31
- Tracks, vias
- 73, 7
- Pours
- 1
- Routed
- Yes
- KiCad
- KiCad 10.0 (file 20260206)
- Created
- 18 Apr 2026
- Updated
- 19 Apr 2026
Overview
TouchCard is an open-source printed circuit board by urjadoshi2024etc-creator, from the urjadoshi2024etc-creator/PinFlow-Hub repository on GitHub, published under the MIT licence. It is a 2-layer board of 35 × 50 mm with 14 parts on 7 nets, routed with 73 tracks and 7 vias.
Its parts include 6 diodes, 3 capacitors, 1 IC and 1 transistor.
README
README.md⚡ PinFlow Hub | Engineering & PCB Design
Welcome to the central repository for PinFlow Hub. This is where I document my journey as an Amateur Electronics & Telecommunication Engineering Student, moving from messy breadboards to professional-grade hardware.
"Turning theoretical engineering into tangible hardware, one mistake at a time."
📟 About the Project
PinFlow Hub is built for aspiring engineers who want to see the real side of electronics. No "perfect" expert tutorials here—just real learning, real debugging, and real projects.
🛠 Current Focus
- Embedded Systems: Working heavily with the ESP32-S3.
- PCB Design: Transitioning from through-hole to professional SMD layouts using KiCad.
- Robotics: Developing interactive desk companions and automated systems.
🚀 Active Projects
| Project | Description | Status |
|---|---|---|
| Mochi Robot | An ESP32-S3 based AI desk companion with a 3D interface. | In Progress 🛠 |
| Touch Card PCB | A sleek, professional capacitive touch card using TTP223. | Prototyping 🧪 |
| Urja Inventory | A Python-based system for tracking hardware components. | Beta 📁 |
🛠 Tech Stack & Tools
- Design: KiCad (PCB Design), Fusion 360 (3D Modeling)
- Microcontrollers: ESP32-S3, Arduino, STM32
- Software: C++, Python, Google Apps Script
- Hardware: SMD soldering (0805 focus), Logic Analyzers
📸 Join the Journey
I share the visual side of these builds, including the "Engineering Chaos" and lab vibes, on my social platforms:
- Instagram: @pinflow.hub
- Pinterest: PinFlow Hub
🤝 Let's Connect
If you are a fellow student or an aspiring engineer, feel free to fork these projects and learn along with me!
Note: Since I am an amateur student, please double-check schematics before ordering your own PCBs. Let's learn together!
🛠️ PinFlow Hub: Recommended Desk Setup
To build professional-grade PCBs like this, I recommend the following "Pro-Student" lab setup. These tools are selected for their precision in handling tiny SMD components and artistic PCB work.
| Category | Essential Tool | Link | Purpose |
|---|---|---|---|
| 🔌 Soldering | Precision Solder (0.6mm) | Buy Here 🛒 | Perfect thickness for small 0805 pads. |
| Brass Tip Cleaner | Buy Here 🛒 | Cleans the iron tip without cooling it down. | |
| Solder Wick (Braid) | Buy Here 🛒 | Essential for fixing solder bridges. | |
| Helping Hands | Buy Here 🛒 | Steady "Third Hand" with magnification. | |
| 📐 Bench & Art | A1 Large Cutting Mat | Buy Here 🛒 | 36"x24" Pro-size desk protection and grid. |
| A2 Medium Cutting Mat | Buy Here 🛒 | 18"x24" Standard size—perfect for student desks. | |
| ESD Safe Tweezers | Buy Here 🛒 | Green Edition: Straight & Curved points for 0805 parts. | |
| Detail Precision Knife | Buy Here 🛒 | For PCB trace cutting and precision art work. | |
| Micro Flush Cutters | Buy Here 🛒 | Cleanly trims legs for a professional finish. | |
| 📟 Logic & Test | Budget Multimeter | Buy Here 🛒 | Best for basic continuity "Beep" tests. |
| Pro Multimeter | Buy Here 🛒 | High-precision debugging for serious designers. | |
| N-Channel MOSFETs | Buy Here 🛒 | Logic-level switching for "No-Code" projects. |
Disclaimer: These are affiliate links. Using them supports PinFlow Hub in developing more free open-source hardware! 🚀
MIT License © 2026 PinFlow Hub
Parts
14| Qty | Value | Footprint | References |
|---|---|---|---|
| 6 | LED | LED_SMD:LED_0805_2012Metric | D1, D2, D3, D4, D5, D6 |
| 1 | 0.1uF | Capacitor_SMD:C_0805_2012Metric | C2 |
| 1 | 10uF | Capacitor_SMD:C_0805_2012Metric | C3 |
| 1 | 22nF | Capacitor_SMD:C_0805_2012Metric | C1 |
| 1 | 47 | Resistor_SMD:R_0805_2012Metric | R - 47 |
| 1 | Battery_Cell | Battery:BatteryHolder_Keystone_1060_1x2032 | BT1 |
| 1 | LOGO | LOGO | G*** |
| 1 | Mosfet | Package_TO_SOT_SMD:SOT-23 | Q1 |
| 1 | Touch_Sensor | Package_TO_SOT_SMD:SOT-23-6 | U1 |
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Questions
How big is the TouchCard PCB?
It measures 35 × 50 mm and has 2 copper layers, 1.6 mm thick.
What parts does the TouchCard use?
14 parts. 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 TouchCard KiCad files?
From the urjadoshi2024etc-creator/PinFlow-Hub repository on GitHub, at the commit this page was made from: the board is TouchCard/Hardware/TouchCard.kicad_pcb and its schematic TouchCard/Hardware/TouchCard.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the TouchCard 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).