webshed.org

The antenna.

I was browsing eBay recently and came across a listing for a cheap digital protractor (with laser line level) - £7.50 delivered; given that good, if not excellent, digital protractors start at around £50, I had to buy it.

My Pimoroni weather station had stopped logging data.

My Pimoroni weather station had stopped logging data.

Investigating the pigment in the yellow lichen Xanthoria parietina.

Resurrection and Repair of a cheap AM Radio

Colour change chemistry with Harpic Power Plus and potassium permanganate.

The Problem I need to be able to remotely power cycle a device in my shed.

I was looking at Neil’s blog the other day and saw a post about adding fediverse tags to pages built with hugo.

I’ve had a Pimoroni weather station running in my garden for around two years.

This experiment uses lead, a toxic heavy metal.

Probably - but let’s experiment anyway.

I wanted to deploy some LLM poisoning code on my server, with the aim of serving up plausible - but nonsensical posts to the various AI scrapers that come by and suck down the entire content of my websites from time to time.

The Lloytron N2405BK Calypso I was browsing around Amazon and spotted this rather nice looking radio priced up at £20 with a time limited discount down to £15.

I have a bottle of heavy water; how pure is it?

Initial observations Disassembly Testing on the bench Alignment Finishing up.

Can I make a Becquerel Daguerreotype in a lunchtime?

Update: September 2025, I’ve scanned and uploaded the manual to the Internet Archive.

A local archive was disposing of some microfilm they no longer required (I checked, and it was all duplicated and had also been digitised).

The Problem Most medium wave receivers use a ferrite rod type antenna, as this keeps things compact and works fairly well.

I want to build a good quality medium wave radio receiver, something that can receive some of the more distant stations that become receivable in the evening, but also hold up against the very strong local stations that can literally be received with a ju…

The medium wave radio band runs from 531–1,602 kHz with 4.5kHz bandwidth in Europe, and 530–1,700 kHz with 5kHz bandwidth elsewhere.

Setting up mDNS (ZeroConf) If you have a single Raspberry Pi (rPi) on your network, you can connect to it via its IP address (192.168.1.128 for example) or via a local DNS name of raspberrypi.local ssh pi@192.168.1.128 ssh pi@raspberrypi.local

This is from a twitter thread from August 2022 I’ve left it pretty much as the twitter thread, just removing some comments that don’t belong to me.

I was contacted by a small city archive to provide a temperature and humidity logging system for their store rooms.

I’m Dr.

Calibrating an RF power meter I needed a rough and ready measurement of RF power at the -40 to 0dBm range, at frequencies from a few hundred kHz to VHF.

How this website is setup using Hugo and Github Actions This website uses Hugo to process markdown test created on any machine and pushed to a git repository on github.

Introduction I wanted to make something for my partner for Valentine’s Day 2014.

My British Gas supplied carbon monoxide sensor started bleeping at me, not the usual battery-dying bleep code, but a rather more serious detector-malfunction bleep code.

How to use DS18x20 1-wire temperature sensors with the Raspberry PI Original date : 2013-02-03 The Raspberry PI (rPI) has several different serial buses brought out on its GPIO (General Purpose Input/Output) pins, including SPI and I2C, however there is no

FT50-43 and FT50-26 Transformers In the cause of converting a Softrock Lite II receiver to work on the new 472kHz (660m) amateur band, I found I needed a broadband transformer with low loss characteristics at these frequencies.

This article was first published on an earlier version of this website in 2012.

An Equivalent Series Resistance Meter Some time ago I was trying to repair a switched mode power supply (SMPS) in my oscilloscope.

A simple FM transmitter for the iPod similar devices My partner wanted to connect her iPod to her stereo system, but the stereo doesn’t have any external inputs.

144 MHz QRSS Beacon / MEPT A radio rally purchase in 2010 turned out to be a telemetry or data transmitter on 160-ish MHz.