Posts on Peter's Homepage

Open-B5: An Expansion for the R&S UPL Audio Analyzer

Wed, 18 Mar 2026 19:28:52 +0200

This article outlines the development of an expansion card for the R&S UPL Audio Analyzer. It is supposed to give this beast an option to listen in on what the analyzer receives.

Electronic Door Access Control

Sat, 28 Feb 2026 17:28:52 +0200

Here is the setup of an electronic door access control system for clubs and also private use.

Development of a Noise-Level Monitor for privacy minded parents

Wed, 14 Feb 2024 21:41:52 +0200

General When many children are in one room, a high sound level can quickly establish itself. The goal of this project is to develop an electronic loudness monitor that determines the decibel (dB(A)) sound pressure level for automatic evaluation, but is technically set up so that the built-in microphone is not suitable for listening to the room. Also, the circuit should be easy to build and have a reasonably large dynamic range.

Semi-autonomous DC power supply

Sat, 08 Oct 2022 11:37:32 +0200

In the following a photovoltaic based DC power supply for various small small consumers in the house.

Among other things, this system also supplies the PiRack.

System in operation

Fumis/Austroflamm with OpenHAB

Sun, 25 Sep 2022 20:51:00 +0200

Here the integration of an Austroflamm pellet stove with a Control unit from Fumis/ATech into an OpenHAB instance is described.

Telephone for glider tow winches

Fri, 25 Feb 2022 21:00:52 +0200

A view of the winch operators panel A special phone for the winch operator on glider airfields is presented here. In contrast to most other projects on this site, it is a completely made up from in analog electronics. It aims to provide more comfort to the the winch operator during launch communication using a headset compared to a conventional telephone receiver. Which needs to be held to the ear using the shoulder, as operation of a winch often needs both operators hands at certain stages of the towing sequence.

Headset adapter from aviation to telephony

Mon, 14 Jun 2021 21:48:52 +0200

Linear drive for a child's bed

Mon, 17 May 2021 19:30:52 +0200

We will take a look on a electromechanically driven children’s bed which should help children find their sleep.

The finished bed

Talking keyboard

Sat, 09 Jan 2021 23:07:52 +0200

This website outlines a modification of an old PC keyboard to become a toddlers learning toy.

Automated extractor/range hood

Tue, 29 Dec 2020 23:07:52 +0200

This website shows the development of a circuit switching a kitchen extraction/range hood automatically on demand

Raspberry PIs in a subrack

Sat, 23 May 2020 19:24:32 +0200

On this page a modular system for the (halfway) neat construction of several Rasperry PI computers including mass storage and power supply.

The whole setup is powered using a semi-autonomous photovolatic DC power supply.

System in use

Bed with a scale

Sun, 10 Sep 2017 16:55:00 +0200

This web site shows the progress of integrating a digital scale into a bed frame. This is only a hobbyist project and as such cannot be compared with commercial offerings.

LIDAR Altimeter

Tue, 29 Aug 2017 16:55:00 +0200

This website portrays the development of a LIDAR altimeter based voice assistant for LSA/Microlight plane use (my own "Barking Bob").
Note: This is currently a work in progress, so stay tuned.