In this project we integrate inexpensive 433MHz RF devices with modern smart devices see also: 433MHz smarter letterbox how to set up RFlink so that it will read your RF sensors The easiest ready-to-roll...
In a previous project I set up temperature sensors in my room and sent the data via Bluetooth to Home Assistant, the home automation platform. Home Assistant is software that can record measurements and...
In this project I control a Sonoff light switch using Home Assistant. You can do the same with other Sonoffs. The switch shown here is the T4EU1C wall plate switch. It works over wifi...
see also more about 433MHz devices The letterbox is five doors and fifty metres from my desk. The uncertainty of the post lady arriving in the afternoon means that I make wasted journeys to...
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...
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...
The need was to meter the use of oil for billing purposes. I solved it easily and inexpensively. This was before the days of home automation – but it nevertheless meets a need inexpensively....
The First World War, that began in 1914, put chemists to work. Their chemicals could harm as well as heal … but on balance the outcome was … horrific. As the author of two...
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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...
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...
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 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...
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...
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 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...
A lot of people use science at work here in Cambridge, England. We started finding and interviewing them for our radio show from 2011 up until 2014. And here they are. Our scientists are professional...
We’ve recorded dozens of scientists and entrepreneurs talking about what their work involves. We hear from experts in Cambridge, England as they talk about their inventions, discoveries and interests. We shout to twitter @105science.
The digits at one end of a large LED clock displayed much more dimly than they ought. I’d say they were about half the brightness – and it was quite a puzzle. The clock...
… 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...
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...
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...
Here is advice to save money without affecting what you end up with. In short: your patio is going to end up looking like it was going to end up. Many tradespeople have a...
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...
SHORT NOTE: If you need to know when a device, like a dryer or washing machine has completed its work, get a ‘smart plug with energy monitoring’. Amazon list many of them but whichever...
This ceiling ‘coffer’ is lit by four 5m LED strips cut slightly down to size. In 2017 digital LED strips were rare. If you wanted really, really bright light, analogue white LED strips were...
The inspiration for this mini-project came from a need to display my oven temperature in a convenient place in the kitchen. I might instead need to see the time of the next train, the...
Without saving, copying or using a USB stick (no!) you can capture interesting images from facebook, instagram, desktop apps and web pages and then use them as needed. I’m not talking about stealing: captured...
My household can’t be the only one that burns the food. The dial on this shiny, expensive Smeg oven not only gives a wrong temperature, the temperature varies over a wide range. I replaced...
The measurements that I take around the home provide two things: – a picture of a moment in time – a room temperature for example. – how something changes over the course of a...
A home automation platform, such as Home Assistant, allows you to make temperature v time graphs using sensors that you might place around the home. Monitoring temperatures allowed me to get my heating devices...
Yes. Below you’ll see how to control HomeEasy devices through Home Assistant and the RFlink receiver/transmitter. (This also controls other manufacturers’ wireless sockets). You’ll be able to create timers and automation to turn things...
or how to selectively expose Home Assistant entities to Alexa with emulated hue Home automation platforms like Alexa, Google Home and Home Assistant show major differences in the devices that they can discover and...
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...
If you want to use a GitHub project with Arduino software follow this step-by-step guide. We’ll make an ESP32 camera web server using the Github code from ‘easytarget’. An ESP32-CAM module consists of a...
Just when I thought I knew enough … I discover why a bicycle headlamp wasn’t working. It was because some 18650 batteries have a button top … The 18650 battery, like many batteries, is...
Here’s what to do when a restaurant asks you to scan a QR code for their track and trace (written in 2020). And here’s how to identify a plant, an animal and lots more....
The need: you use a table light for watching TV and a main (wall) light at other times and you want a coffee table button to switch between one or the other or have...
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...
The touch light switch on the wall lies in wait for someone to press it. When it’s on a press turns it off and when it’s off it turns on. That’s toggling a switch....
I wouldn’t especially recommend the D-Link DCS-D150 motion sensor but it does have some features that had me buy it. Firstly it plugs into a wall socket above a worktop so it can sense...
If you could look inside an old replaceable laptop battery pack like this you’d find 4 or 6 cells. Usually the cells are 18mm diameter, 65mm long and are called 18650 lithium batteries. Each...
Includes up-tempo anything and even some country music.
Broadly latin, cha cha, afro, carib beats
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
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...
More recently discovered or rediscovered make-you-want-to-dance tracks. I like em as they have some magic – they need a test for instant appeal.
Sometimes a laptop goes into a comatose state that no amount of charging or on-offing can end. If the laptop has a removable battery the solution might be to Disconnect the power supply and...
‘Smart meters’ and metering devices usually measure the electricity used by the whole house*. However I prefer to pay attention to the electricity used by individual devices, such as a combination oven, fan heater...
The regular way to switch a Sonoff relay is to use the official ewelink app – however Home Assistant doesn’t* work with ewelink. Other ways require you to ‘flash’ the Sonoff device with Tasmota...
The Home Assistant dashboard (aka ‘Lovelace’) is very good at displaying live sensor data and sensor data from the last several days. As you can see below you can display a ‘just now’ reading...
How to make inexpensive, ‘old’ technology, 433MHz devices work with today’s smart devices see also: 433MHz smarter letterbox RF sensors and receivers If you’ve used any of the following examples you probably own some...
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...
rogerfrost.com is a compendium of ideas for using technology to find answers to sciencey questions. Since 1995 it has provided ideas to school science teachers. Since 2020 we’ve focussed on questions around the home with a new home automation section. So today we look at ways to measure and monitor around the house.
You will find everything here tagged and indexed by topic or technology.
Roger Frost was a writer from 1988 and this web includes many of his articles for magazines and newspapers. They tell how the early Internet developed; how real scientists work and how real people, like you might use technology at home or school.
Do please add a comment to an article or say hi via the social links. Use this content freely and link back here if you can.
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