Hardware

RGB LED strip driver with Infra and RF remote control (Atmel AVR MCU, RFM73 radio)
8*8*8 LED Cube - mbed LPC1768 ARM Cortex-M3 (pdf) [2010] (Hungarian)
USB-s KeyPad Controller with programmable keyboard layout
FPGA calculator with VGA+PS2 interface (pdf) [2009] (Hungarian)
USB-s hardware key (AES, twofish) (Hungarian)
IGT - Slot Accounting System (SAS) protocol interface ⬒
Mechanical counters, coin, hopper, digital I/O interface card programming (for gaming machines)
Ultrasonic spirometer development
Smart Building System
Infra Remote Control (with LIRC and microcontroller)
Atmel AVR JTAG programmer
Microcontroller controlled Audio Amplifier
LCD with TouchScreen for industrial application
...

Software

Some useful and less useful source code: Pascal/Delphi, scripts (batch, perl, vbs), Matlab.

Arm mounted display (eInk/OLED display, Bluetooth, ARM MCU, RTOS)
Motion tracking (9 DOF IMU, Bluetooth, ARM MCU)
Smart home devices (thermostat, 230V electricity switch and power meter, remote controller)
IoT impulse meter for smart meter application (GSM, GPRS, LoRa, STM32 ARM MCU)
GPS tracker (GSM, GPRS, GPS, STM32 ARM MCU)
Online scale (GSM, NB-IoT, load cell, temperature, STM32 ARM MCU)
IoT soil monitor (GSM, GPRS, GPS, sensors, Atmel AVR MCU)
Multi channel audio mixer (MCU in FPGA)
Flying drone peripheral and device drivers (barometer/altimeter, temperature, GPS, IMU, SBus, SmartPort, NXP ARM MCU, FreeRTOS)
Robot peripheral (with ROS serial)
Heim Zodiac Data System RSM IRIG 106 IEEE 1394, e-SATA data recorder with Declassify support (ARM) [2012]
Resource efficient HW platform and C++ util library for embedded controllers
DNS sequence fitting x86, x64 CPU (pdf) [2010] (Hungarian)
Industrial monitoring system (GSM, temperature and gas sensors, RS485, Atmel SAM ARM MCU)
Central Logging (syslog, SSL)
Multiplayer Tetris game for Symbian (Nokia Mobile Phone)

Command display (with offline map), data processing and transfer between command center and attached Bluetooth devices
Embedded device support tools: Serial data logger, Protocol Buffer over Bluetooth tester
Data processing and analyser tools, chart display
Probability calculator

(HTML, CSS, Javascript, PHP, MySQL, SQLite)

Smart home device management
Server administration tools
Server monitoring and statistics (rrd)
Version control management (repositories, user access rights)
Online sensor network monitoring and administration dashboard, API, data input endpoint
Real time messaging and GPS tracking with map (websocket, Node.js backend)
Math tools (Boole-algebra, probability calculator)
Tools for games (Hearthstone Volcano, Folklore)
Education pages
URL database (categories, search, filter, statistics)
DVD catalogue (full file list view with video metadata)

Fuel Station Manager office software (databases, data import/export, editing, TIRIS card reader, radio communication, automatic software update...)
Recipe and product database with web UI and bar code reader
GPS data logging and visualization with Google Earth (3D)
Electric power consumption meter/logger
Temperature logger (with php web UI)
External LCD display for Winamp (plugin)
Volume control software for Audio Amplifier
Serial port terminal
Network tools (UDP logger, SMTP relay)

System administration scripts (database import, LDAP management, video compression automation...)
Other tools for data collection (file metadata extractor)

MS Windows OS, Active Directory, FTP, HTTP, database servers, SSL certificates...