Steffen Kappler - Freelancer – Software Development

Recommended expert

Karlsruhe, Germany

Experience

Dec 2024 - Feb 2025

3 months

Karlsruhe, Germany

Freelancer – Software Development

LightnTec GmbH

Implementation of an RGBW function on a microcontroller to drive flexible LED matrix displays in Embedded C
Implementation of various algorithms to calculate a white channel
Extension of a web interface

May 2024 - Jul 2024

3 months

Karlsruhe, Germany

Freelancer – Software Development

LightnTec GmbH

Implementation of the sACN protocol on a microcontroller to drive flexible LED matrix displays in Embedded C

Aug 2023 - Nov 2024

1 year 4 months

Remshalden, Germany

Freelancer – Software Development

Kurz Industrie-Elektronik GmbH

Definition and implementation of a protocol for data exchange between multiple microcontrollers via SPI, Bluetooth, and UART
Implementation of low-latency Bluetooth data transmission software on a microcontroller using the nRF Connect SDK in Embedded C and Zephyr OS with multiple participants (multilink)
Control of BLDC motors on a microcontroller using STM Motor Control in Embedded C
Evaluation of software frameworks (LVGL and Segger emWin) for a graphical user interface on a microcontroller
Commissioning of a motor control hardware component
Development of a software solution for a motor test bench on a microcontroller in Embedded C and FreeRTOS, including implementation of the Modbus RTU protocol to control the electronic load and the speed sensor
Implementation of a control algorithm (PI controller) to improve the speed regulation of a BLDC motor and reading an angle sensor via I2C
Implementation of a debug output via USB (virtual COM interface)

Mar 2019 - Aug 2023

4 years 6 months

Karlsruhe, Germany

Employee – Software Development

LightnTec GmbH

New development and enhancement of systems for driving flexible LED matrix displays
Development of software solutions for microcontrollers and system-on-modules in Embedded C/C++ and Python
Implementation of an RS485-based protocol in Python
Further development of a Linux-based Artnet media server using Golang, JavaScript, React, as well as Docker and Bash scripts
System configuration using HTML and JavaScript
Conducting system tests
Commissioning systems in the field
Configuration and installation of customer projects

Feb 2018 - Jul 2018

6 months

Karlsruhe, Germany

Working Student – Hardware Development

Vigem GmbH

Development of an IP core for capturing MIPI – CSI 2 image data

Mar 2017 - Apr 2017

2 months

Karlsruhe, Germany

Self-employment – Software Development

Panta Rhei Design

Implementation of a deep discharge protection function for batteries on a microcontroller

Mar 2016 - Aug 2016

6 months

Karlsruhe, Germany

Practical semester – Hardware Development

INIT GmbH

Design and implementation of electronic assemblies
Development of a test bench for assemblies

Mar 2015 - Apr 2015

2 months

Karlsruhe, Germany

Self-employment – Software Development

Panta Rhei Design

Development of a DMX node for controlling RGB LEDs on a microcontroller

Skills

Technical Focus

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

Skills

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, Artnet, Modbus Rtu
Test And Measurement: Oscilloscope, Logic Analyzer, Multimeter