start using home assistant (esphome 1)

what you need to run your own home automation server Raspberry Pi – a kit with Raspberry Pi 3+ or later with the recommended power supply, 32Gb SD card, heatsinks and/or cooling fan. A...

museum of data logging

Here are pictures of labs, data loggers, sensors and experiments from the 1990’s to the 2000’s. You’ll see different solutions to computers in a lab and for example, different colorimeters and different ways to...

latent heat – salty ice

When it is icy they put salt onto the roads to melt the ice. What the salt does is to depress, or reduce, the freezing point of water. The result is that the ice...

types of battery

Batteries are a handy source of power. You’ll know that there are different kinds of batteries, and maybe that some are good for some jobs, and some for others. But battery power is expensive. It...

radioactive half-life

Radioactive materials decay, or lose their radioactivity, in a predictable way. If you have a fast decaying source, such as Protactinium with a half life of just 72 seconds, you can take a series...

heat conduction

You can use a temperature sensor to study the conduction of heat through materials. Two temperature sensors allow you to compare different materials at the same time. In this example, you heat strips of...

insulation

You can use a temperature sensor to study the insulating properties of materials. Two temperature sensors allow you to compare different materials at the same time. In this example two beakers of hot water...

measuring visible change in liquids

Measuring the appearance of cloudy sulfur when we mix acid and sodium thiosulfate is a popular science teaching activity. We can change the temperature or concentration of the reagents, and see whether the mixture...

LED light project examples

There are LED strip lights where every LED can be doing something different with the result that you can create effects. Throughout the ‘Zoom’ years of 2020-2021 I experimented showing different things in the...

addressable LED light projects

There are ‘analogue’ LED lights on a tape that do a fine job of creating interesting lighting. All the LED lights on the strip usually do the same brightness or colour. There are also...

Jura coffee machine repairs

… how to service or replace the brewing unit on a Jura coffee machine and other fixes. It might be assumed that if you can afford the BMW of coffee machines, you can afford...

Cheesecake – Jewish style

Some cheesecakes are set with gelatin and have smooth, jelly-like texture. This cheesecake is baked and sets due to its whipped egg. When chilled it has an appealing dry, soft, crumbly texture. I use...

owning a marquee – garden tent

A garden marquee is quite the thing in times not only when only outdoor mixing is allowed but also when you live in a climate with rainy summers. This page collects my experience of...

Countax mower repairs – C600 – year 2008

A page where I record successful repairs as they happen. The parts list on my 2008 C-series is downloadable below. Steering Problem – can’t steer The Countax steering mechanism is surprisingly simple – a...

XANES 2606-8 headlamp review and instructions

This insanely bright headlamp / flashlight is excellent for hobbies, camping and cycling. Here are a few instructions to use it well This flashlight (aka torch) requires 2 x 18650 Lithium cells which have...

T4EU1C and Home Assistant

a 3-gang wall switch for your home automation – using eWelink, T4EU1C and Home Assistant I got to a point where I had plenty of ‘smart’ lights and gadgets but few switches. But then...

rgr – swing party – fast and bouncy

Tracks have that extra for swing but leave the rest of us breathless. What gets in here: syncopation; swing; faster; lindy hop; east coast swing; cowboy country music

rgr – baby boomers party

These tracks might be for parties and weddings with the generation heading towards their funerals. Tracks from the Tamla Motown, Disco era and 90’s have been a staple of, at least, my party years...