Building an efficient End-Fed Half Wave transformer using special Ferrite 2643625002 from Fair-Rite

A few months ago I was reading an article written by Owen Duffy that a compact, low-loss QRP-capable EFHW (1:49) transformer could be build using the Fair-R...

Useful, affordable tools for daily embedded development tasks

This is a more or less incomplete list of useful tools which are helping with the daily business of developing embedded stuff. FTDI FT2232HL Can be easily ...

Minimal ESP-IDF Modbus TCP example

As the ESP-IDF Modbus TCP is rather complex I decided to strip it down to a bare minimum. This implemention is based on ESP-IDF v4.4.1. It increases an uin...

ESP-IDF v4.4.1 is having a faulty OpenOCD and hidden Python 2 dependency coming from GDB

This evening I spent some time playing around with the new Visual Studio Code plugin for the Xtensa ESP32 microcontrollers. It was painful. Even for regular...

Running a stratum 2 NTP server for ntppool.org on a VPS

As I moved my VPS to a new provider I’m having the luck of having a spare Contabo VPS server for a month. Unlimited bandwidth, 6 cores and 1.7TB of availabl...