Christian Zuckschwerdt's blog

Apps, Themes, Tutorials — free and open source

SDR + rtl_433

SDR projects and rtl_433 documentation.

Documentation for rtl_433 and other SDR projects.

Are you looking for rtl_433 documentation and related SDR projects? Vist the site.

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MP3 Scan + Repair

The audio repair tool to check and fix all your MP3 files.

Check and repair your MP3 audio files.

Some of your audio players might be picky or play choppy sound. Scan and fix all your MP3 files for best performance! And it's free, too!

MP3 Scan + Repair

Mouse Acceleration for OS X

Set up extended speed parameters for your mouse.

Extended mouse settings

The Mouse Acceleration PrefPane is a GUI and startup item to Richard Bentley's MouseFix.

You can set up extended speed parameters and acceleration curves for your mouse.

  • Increase mouse pointer precision
  • Speed up your mouse movement
  • Set mouse acceleration parameters
  • Full control with just two simple knobs

Mouse Acceleration for OS X

LimeNET-micro setup with Raspbian


A LimeNET-micro just arrived, and the plan was to test Ubuntu Core for CM3 and the LimeNET snaps. But that won’t boot (I still need to check the older Core 16) and while I figure out if the DTB or the boot setup is wrong I run Raspbian. Here are some notes to set that up with rtl_433.

rtl_433 with MQTT, Graphite, InfluxDB, …


The ISM-band decoder (433.92 MHz, 915 MHz – in America, 868 MHz – actually SRD-band) rtl_433 can output events and data to network easily. Here is a short guide.

SDR Nyquist effect plugin to AM decode IQ signals


A simple Nyquist effect plugin to convert I/Q (in-phase and quadrature) signals to Amplitude/Phase (AM decode radio signals). Analyse and decode On-Off-Keying (OOK) / Amplitude-Shift-Keying (ASK) signals recorded by e.g. RTL-SDR software with Audacity.

Dead Pixel Tester


No need to download some shady app just to test your screens pixels. Free, open, portable, fast, universally available! Bring out your dead … pixels.

Rotating Folder Backup Script

#Script #Backup

How do you create folder backup archives and limit the size by rotating old ones out? A common task and there are plenty of solutions. This is more or less the poor man’s solution I’m running from cron.

GKrellM SNMP Plugin

#Plugin #GKrellM #SNMP #gkrellm-snmp

Your great monitor stack GKrellM is now able to read SNMP agents.

Do'SSi Zo'la Linux game

#Patch #Linux #Game #dossizola

Do’SSi Zo’la is a board game under GPL licence, using SDL. You can play with two players or you can play on your own against the computer.

GKrellM Timers Plugin

#Plugin #GKrellM #gkrellm-timers

A versatile timer plugin for GKrellM.

About the Author

Hi there! I'm Christian Zuckschwerdt a freelance software designer from Germany. On this blog I'd like to share some free and open source software for GNU/Linux and Apple Mac OS X.
There are also some themes and tricks for the Drupal CMS. And then the occasional hardware or gadget hack. It's all free and mostly licensed under the GPL or CC.
Write a comment or send me a mail. I love to hear from you!

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