project: oil tank level sensor

A heating oil tank level sensor that’s more useful than anything you can buy. Measures oil level in any unit – litres, gallons or days until I need to refill the tank Displays readings...

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...

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 bouncey

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...

best uses for a smart socket

smart sockets have uses. A smart socket adds a little cleverness to a table lamp or electric heater. The printer upstairs takes five minutes to warm up so switching it on by remote control...

calculate how long is the day

… and see how to add features to the Home Assistant display An interest in solar energy is a possible reason to record the sun’s azimuth and the time of sunset. Home Assistant can track...

extending Home Assistant (esphome 2)

If you want to make your own smart measuring device or presence detector or dog watching camera or tea bag lifting robot, the ESP32 and Arduino circuit boards make the gadget you need. A...