Słomkowski's technical musings

Playing with software, hardware and touching the sky with a paraglider.

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Welcome to my website! I’m Michał Słomkowski, if you want to contact me, you will find the details at the bottom of the page. Recent articles published or updated:

Octoglow VFD - Clock display board

Octoglow VFD - Clock display board

Second module of Octoglow, which contains numerical VFD to display wall time and 433 MHz weather sensor receiver.

Automatic USB mains switch for USB-controlled power strip

Automatic USB mains switch for USB-controlled power strip

Almost all available USB-controlled power strips use 5 V from USB to drive the relay. This is no use with recent PCs, which hold 5 V during sleep mode. I've written alternative firmware for popular DCT Tech USB relay module available from AliExpress, which detects bus inactivity and shuts the relay down when PC is in sleep mode.

Extracting security codes from old car radios

I needed to determine the security code of Becker Europa 2000, usually installed in Mercedes-Benz W124. I dumped the contents of an internal EEPROM via I²C and read the code.

Microlab speaker IR remote hijack - autostart and input select

Microlab speaker IR remote hijack - autostart and input select

I use Digispark module to inject NEC protocol commands to start Microlab 6C speakers and select sound source automatically at startup.

Octoglow VFD - Orange Pi Zero board and software

Octoglow VFD - Orange Pi Zero board and software

Module which houses the brain of the Octoglow - the Orange Pi Zero single board computer. It also contains I²C DAC to drive analog gauges to show CPU usage in real time.

Paramotor helmet with headset

Paramotor helmet with headset

Skateboard helmet accompanied with Peltor earmuffs and communication equipment is a legitimate alternative to expensive off-the-shelf paramotor helmets which in fact are built on the same principle. I use military-grade differential dynamic microphone to achieve superior speech intelligibility.