Steffen Kappler
Freelancer – Software Development
Experience
Dec 2024 - Feb 2025
3 monthsKarlsruhe, Germany
Freelancer – Software Development
LightnTec GmbH
- Implemented an RGBW function on a microcontroller to drive flexible LED matrix displays in Embedded C
- Developed various algorithms to calculate a white channel
- Expanded a web interface
- Languages: Embedded C, JavaScript, HTML
- Frameworks: Keil MDK Middleware
- Technologies: Ethernet, sACN, JSON API, Web server, IGMP protocol
- Tools: GIT, SVN
- IDEs: Keil MDK µVision
- Platforms: Keil RTX RTOS
- Hardware platforms: STM32Hxxx
- Test equipment: Logic analyzer
May 2024 - Jul 2024
3 monthsKarlsruhe, Germany
Freelancer – Software Development
LightnTec GmbH
- Implemented the sACN protocol on a microcontroller to drive flexible LED matrix displays in Embedded C
- Languages: Embedded C, JavaScript, HTML
- Frameworks: Keil MDK Middleware
- Technologies: Ethernet, sACN, JSON API, Web server, IGMP protocol
- Tools: GIT, SVN
- IDEs: Keil MDK µVision
- Platforms: Keil RTX RTOS
- Hardware platforms: STM32Hxxx
- Test equipment: Logic analyzer
Aug 2023 - Nov 2024
1 year 4 monthsRemshalden, Germany
Freelancer – Software Development
Kurz Industrie-Elektronik GmbH
- Defined and implemented a protocol for data exchange between multiple microcontrollers over SPI, Bluetooth, and UART
- Developed low-latency Bluetooth data transfer software on a microcontroller using nRF Connect SDK in Embedded C and Zephyr OS with multiple participants (multilink)
- Controlled BLDC motors on a microcontroller using STM Motor Control in Embedded C
- Evaluated software frameworks (LVGL and Segger emWin) for a graphical user interface on a microcontroller
- Commissioned motor control hardware component
- Developed software solution for a motor test bench on a microcontroller in Embedded C and FreeRTOS; implemented Modbus RTU protocol to control electronic load and speed sensor via Modbus RTU
- Implemented a control algorithm (PI controller) to improve speed control of a BLDC motor; read an angle sensor over I2C
- Added debug output over USB (virtual COM port)
- Languages: Embedded C
- Frameworks: STM Motor Control, Nordic nRF5 SDK, Nordic nRF Connect SDK, Segger emWin, LVGL
- Technologies: Bluetooth Low Energy, Modbus RTU, SPI, I2C
- Tools: GIT
- IDEs: STM32CubeIDE, Segger Embedded Studio
- Platforms: FreeRTOS, Zephyr OS
- Hardware platforms: STM32Gxxx, nRF52xxx
- Test equipment: Oscilloscope, Logic analyzer, Multimeter
Mar 2019 - Aug 2023
4 years 6 monthsKarlsruhe, Germany
Employee – Software Development
LightnTec GmbH
- Developed new and updated systems for driving flexible LED matrix displays
- Built software solutions for microcontrollers and system-on-modules in Embedded C/C++ and Python
- Implemented an RS485-based protocol in Python
- Enhanced a Linux-based Art-Net media server using Golang, JavaScript, React, Docker, and Bash scripts
- Configured systems using HTML and JavaScript
- Conducted system tests
- Deployed systems in the field
- Configured and installed customer projects
- Languages: Embedded C/C++, Golang, Python, JavaScript, HTML, Bash
- Frameworks: Keil MDK Middleware, React
- Technologies: HDMI, Ethernet, Art-Net, ffmpeg, JSON API, Web server
- Tools: GIT, SVN, Docker
- IDEs: Keil MDK µVision, Atmel Studio, GoLand, VS Code
- Platforms: Keil RTX RTOS, Linux
- Hardware platforms: STM32Hxxx, Atmel ATmega, Raspberry Pi
- Test equipment: Oscilloscope, Logic analyzer, Multimeter
Feb 2018 - Jul 2018
6 monthsKarlsruhe, Germany
Working Student – Hardware Development
Vigem GmbH
- Developed an IP core to capture MIPI-CSI 2 image data
- Languages: VHDL
- Technologies: MIPI-CSI 2
- Tools: GIT
- IDEs: Xilinx Vivado
Mar 2017 - Apr 2017
2 monthsKarlsruhe, Germany
Self-employed – Software Development
Panta Rhei Design
- Implemented deep discharge protection function for batteries on a microcontroller
- Languages: Embedded C
- Hardware platforms: Atmel ATmega
- IDEs: Atmel Studio
Mar 2016 - Aug 2016
6 monthsKarlsruhe, Germany
Practical Semester – Hardware Development
INIT GmbH
- Designed and built electronic assemblies
- Developed a test bench for assemblies
- Languages: Python
- Tools: GIT, Altium Designer, LTSpice
Mar 2015 - Apr 2015
2 monthsKarlsruhe, Germany
Self-employed – Software Development
Panta Rhei Design
- Developed a DMX node to control RGB LEDs on a microcontroller
- Languages: Embedded C
- Hardware platforms: Atmel ATmega
- Technologies: DMX, PWM
- IDEs: Atmel Studio
Sep 2008 - Jan 2011
2 years 5 monthsBad Wildbad, Germany
Apprenticeship – Electronics Technician for Devices and Systems
Berthold Technologies
- Designed and built functional test rigs for electronic assemblies
- Languages: Assembly, Embedded C
- Hardware platforms: Microchip PIC16F84
- IDEs: MPLAB
- Tools: Eagle
Summary
Embedded software development in C/C++
Real-time operating systems
Backend development in Golang, Python
Frontend development in JavaScript, React
Development of LED matrix displays
Programming languages: Embedded C/C++, JavaScript, Golang, Python, VHDL, Bash
Frameworks: Keil MDK Middleware, CycloneBOOT, React, STM Motor Control, Nordic nRF5 SDK
IDEs: Keil MDK µVision, STM32CubeIDE, Segger Embedded Studio, VS Code, CLion, GoLand, Atmel Studio, Xilinx Vivado
Tools: GIT, SVN, Eagle, Altium Designer, LTSpice, Docker
Hardware platforms: STM32, ATmega, Raspberry Pi, Nordic nRF52
Platforms: Keil RTX RTOS, FreeRTOS, Linux, Zephyr OS
Protocols: SPI, I2C, UART, Ethernet, TCP/IP, UDP, HTTP, Bluetooth Low Energy, Art-Net, Modbus RTU
Test equipment: Oscilloscope, Logic analyzer, Multimeter
Languages
German
NativeEnglish
Advanced Education
Oct 2013 - Jul 2018
Karlsruhe University of Applied Sciences
Bachelor of Engineering · Electrical Engineering – Information Technology · Karlsruhe, Germany
Sep 2008 - Jan 2011
Berthold Technologies
Electronics Technician for Devices and Systems · Bad Wildbad, Germany
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