⚡ KapTester V2

Capacitance Tester — ATmega328P based custom PCB project
Built as AP2 (Abschlussprüfung Teil 2) — Vocational exam project 🇩🇪

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📷 Photos

Coming soon – V2 build photos

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📖 About

The KapTester V2 is a custom-built capacitance measurement device based on the ATmega328P microcontroller. It was designed and built from scratch as part of a vocational training exam (IHK AP2), covering all phases from schematic design to PCB manufacturing and firmware development.

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⚙️ Hardware

Component	Details
MCU	ATmega328P @ 16MHz
Display	SSD1306 OLED 128x64 (I2C)
Voltage Reg	LM317 (1.2V – 32V adjustable)
PCB	Custom 2-layer, manufactured by PCBWay
Power	USB (5V)
Interface	Tactile button, screw terminals

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💾 Firmware

Three firmware versions were developed during the project:

Version	Folder	Description
FW1	fw1_produktion	Production firmware – stable release
FW2	fw2_test	Test firmware – debugging & measurement testing
FW3	fw3_Voll	Full feature firmware – all functions enabled

🔧 Flashing

# Flash production firmware via avrdude
avrdude -c usbasp -p m328p -U flash:w:fw1_produktion/kaptester.hex:i

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📁 Repository Structure

KapTesterV2/
├── Firmware/
│   ├── fw1_produktion/     # Production firmware (main.c, .hex, .elf)
│   ├── fw2_test/           # Test firmware
│   └── fw3_Voll/           # Full firmware
├── KiCad KapTester V2/
│   ├── KapTesterV2.kicad_sch   # Schematic
│   ├── KapTesterV2.kicad_pcb   # PCB layout
│   └── GerberV2/               # Gerber files for manufacturing
├── Dokumente/              # Project documentation (German)
│   └── Phasen/             # Phase documentation (Info/Plan/Build/Evaluate)
└── Präsentation/           # Final exam presentation (PPTX + PDF)

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🛠️ Tools Used

• AVR-GCC – Firmware compilation
• avrdude – Flashing
• KiCad 8 – Schematic & PCB design
• PCBWay – PCB manufacturing

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📄 License

MIT License – feel free to use, modify and build upon this project.