VAVRA SYSTEMS

Tomáš Vávra · independent electronics and firmware engineer

From electronics to software. One system that works.

I develop electronics and firmware, connect devices to software and diagnose problems in operation. I can help with a new device or a specific change to an existing one.

Selected work Get in touch
SYSTEM PERSPECTIVE
04 COMMUNICATION & DATA protocols · diagnostics · monitoring
03 FIRMWARE & CONTROL logic · real-time · control
02 HARDWARE electronics · PCB · power
01 PHYSICAL WORLD sensors · actuators

One system. Every layer that matters

How I can help

What are you working on?

01

Developing a device or adding a feature

I design electronics and PCBs, bring up hardware and develop firmware. The task might be a working prototype, a new feature or a change to an existing design.

02

Connecting a device to software or other equipment

I develop communication interfaces, drivers and device libraries so software can configure equipment, read measurements or control its operation.

03

Tracking down intermittent faults

I investigate faults that occur only occasionally or arise from interactions between electronics, firmware, applications and communication. The work spans finding conditions that reproduce the problem, identifying its cause and verifying the fix.

04

Adding measurement or automatic control

I integrate sensors, data acquisition and control for a specific task, such as recording operating data, monitoring equipment or automating a repeated operation.

Engineering in practice

Selected work

Selected experience from professional and personal projects. Each study describes the starting point, my role and the resulting solution.

01 Testing and diagnostics of CAN devices

USB adapter prototype for CAN FD

I developed firmware and a .NET library to connect two CAN FD buses to a PC and record traffic on an SD card. The tested prototype provided a basis for Oakrey’s further hardware development.

Development for Oakrey s.r.o. · my role: firmware and .NET client library

  • CAN FD
  • FreeRTOS
  • .NET
Read the case study
02 Laboratory automation

New firmware for a robotic manipulator

I rewrote both modules’ prototype firmware in C on the same hardware. A shared library and bootloader supported each module’s own axis-control routines; calibration no longer required code changes for each unit.

Anonymised professional project · my role: firmware for both controller modules

  • C
  • Motion control
  • Diagnostics
Read the case study
03 Laboratory instrumentation

Stabilising a high-voltage amplifier

Instability during short-pulse generation was resolved by combining changes to the analogue compensation with firmware limits on the rate of voltage change.

Anonymised professional project · my role: power-stage diagnostics and stabilisation

  • Analogue electronics
  • Measurement
  • Firmware
Read the case study
04 Garden irrigation

Irrigation control with local measurements

Inaccurate rainfall data and irrigation with no water available distorted the soil water model. Local measurements and checks on actual water use improved the model and helped detect faults.

Personal project · design and implementation

  • ESP32
  • Sensors
  • Control
Read the case study

Engineering skills

Technical experience

When diagnosing complex hardware/software systems, I work with board schematics, an oscilloscope and firmware and application debuggers. Where needed, I modify the PCB for measurements, analyse communication or trace system execution. I connect findings across these parts to identify the cause of a fault.

  • Electrical measurements
  • Electronics diagnostics
  • Electronics / PCB design
  • Hardware bring-up
  • C / C++
  • C# / .NET / Python
  • Embedded Linux / RTOS
  • CAN / CANopen
  • Ethernet / TCP/IP

Working together

We can start with a specific task

A measurement task, device library or firmware change can be a complete assignment. Describe the equipment and the result you need. We can agree on the scope and how to verify the outcome; if the solution is still unclear, we start by identifying what needs to be investigated.

About

I’m Tomáš Vávra

I’m an independent electronics and firmware engineer. I have worked professionally in these fields since 2014. I help companies develop devices, take measurements and solve technical problems. I present my work under the VAVRA Systems name.

You work directly with the person who designs and implements the solution.

Contact

Let’s discuss your project

Tell me about the equipment and the result you need. You don’t need a finished technical specification.

Tomáš Vávra · independent engineer

tomas@vavrasystems.cz