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...

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...

project: smart immersion heater

Domestic hot water can be heated by a gas / oil central heating boiler or by an electrical immersion heater. I choose to take advantage of half-price nighttime electricity and use an immersion heater....

which ESP32 did I buy?

“… It’s an ESP32. Yes but which?” ESPRESSIF is the company that markets chips such as the ESP8266 and ESP32 and ESP32-CAM. Other companies buy those chips and fit them inside their smart plugs,...

project: cameras around the house

There are a variety of camera types to help monitor the drive, a pet, a baby, a device, a bird feeder – whatever. You might want to know what’s eating the rabbit’s food or...

project: does my broadband speed vary?

Here’s how to add a little functionality to Home Assistant, the automation platform. Do try this especially if you’re just starting to add features to Home Assistant. speedtestdotnet: scan_interval: hours: 4 Go to the...

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...