Some of my projects are connected to the mains voltage! When opened, and while building the projects the mains voltage may be exposed. Please be very careful with electricity. Only mess with the mains voltage if you're very confident about your capabilities. Also be very careful with your relatives, don't leave the projects open and connected to the mains while unattended.
The projects will be presented as they are. I can not guarantee that the projects will do what you expect them to do.
Early 2002 I stumbled upon a web site dedicated to micro processors, which appeared to be created by a woman.
To cut a long story short, Izabella and I became pen palls, or better said MSN palls.
We have swapped quite some ideas and we even started building a project together, although we never met personally.
Unfortunately she is no longer with us.
I have saved her legacy here on this site to keep her contribution to the web alive.
Some people claim the Apple 1 was the first true home computer.
It was semi complete, including a full keyboard and a TV set, abused as monitor.
Here are some articles about the Apple 1 and some of its replicas, including some software for these machines.
This is an article about one of the many training computers from the eighties.
It's a Z80 based single board computer, in the shape of a book.
Here you can find invaluable information in case you own one without any manuals.
I even throw in a few experiments as well.
Due to unforeseen popularity the Rasberry Pi had a bit of a rough start in 2012. After a long, long wait my first Pi has finally arrived. And here's what I do with it....
My isolation transformer can supply 2.5 A. However, without a current meter I never know when I’m about the exceed that maximum current. With this analog current meter I can easily monitor the output of my precious transformer. And it even is a True RMS analog current meter. I doubt there are many of those around!
Sometimes I have an idea in my head to build something. Extend an already existing thing, like a power strip for instance. Whether I would need a remote controlled power strip or not is irrelevant in this case. And the funny thing is that I can’t stop thinking about such a project until it is finished.
That’s why I’ve built Carl, my power strip controller which can be controlled by Telegram and MQTT.
Sonoffs are very affordable, and therefore very popular mains switches from China. The downside is that they use their own proprietary software and servers to control them. This can be changed by installing Tasmota software on them.
This project explains how I’ve done that, so I’ll know what to do when I want to add more of them. Hopefully the information is useful for you too.
Just a quick project to connect my old Voltkraft M-3850 multi meter to a USB serial port instead of the original old fashioned DB-25 serial interface.
Infrared control signals don’t travel well through cupboard doors. And yet we tend do like to hide all the equipment clutter away from sight in a cupboard, which usually doubles as a table for the TV to stand on. But how do you control such equipment, when it’s hidden behind a door? Simple with an IR repeater.
With this project I’m taking microprocessor programming to the 21st century. No more Eprom swapping during programming. Simply upload the new file the Eprom Emulator and the new program is already running on your vintage 8-bitter.
I don’t often have to measure temperatures. That’s why I have neglected my Fluke 80T-150 temperature to voltage converters for such a long time. I took some time to get them back to life again, so they are on standby now, should I want to measure temperatures again soon.
Buying a ready made device doesn’t always guarantee that it is fit for purpose. We’ve bought an Ikea wardrobe LED strip, with sensor. It appeared that it needed some electronic tinkering to make it do what we want, light the wardrobe when we’re standing in front of it.
This easy to build adapter helps me a lot when I want to use my Mooshimeter to safely measure the consumed power of electrical devices connected to the mains.
I needed a bed side table clock.
So why not build one from parts which have been sleeping in my junk bin for over 30 years?
Here's the result, built with series 4000 CMOS devices.
Our energy supplier has installed a smart meter in our house. It appears that this smart meter isn't that smart at all Unless you teach it some tricks yourself.
With this simple Raspberry Pi project I'm now able to control my SB-Bus devices from any computer in the house. No, I tell a lie, with any computer from all over the world that is!
No..... not the alien space ship in the shape of Eddy Murphy which came to earth to steal the salt from our oceans. Dave is one of my minions, who'll take over the control of our house, well at least a small part of it.
A very old dream of mine came true when I finished this project.
It enables a standard Fluke 8010 or 8012 to be connected to a computer using the SB-Bus.
Now you can collect the measured values on any type of computer. And as a bonus I've managed to throw in a few extra goodies.
Philips used to build very nice and accurate frequency counters back in the eighties.
I gave this counter a new and smarter brain and now it can be connected to the SB-Bus and has some extra ordinary new features. Some of them can only be found on the more expensive counters.
My home cinema set is located in Harry Potter's bedroom (cupboard under the stairs).
So in order to be able to control the digital recorder and blue ray player I needed an IR repeater.
And I also needed an optical digital audio input selector.
Both proved to be difficult to find or were ridiculously expensive.
In my current profession I needed to measure low ohmic resistors quite often.
However measuring low ohms is a special art, which requires a (portable) constant current source.
This device, together with a strong enough battery, supplies an accurate pre-defined constant current.
It can also be used to measure the capacity of rechargeable batteries.
I've built this project back in 1993 when it was used for a variety of experiments. This project shows you the most basic micro processor system you can find, built around the Motorola 6802 processor.
Before I started the SB-6668 project I needed to know how the original program of the PM-6668 worked.
Therefore I needed a way to read the contents of its micro controller.
Together with the Nano computer this project reveals the programs from any 8048 and 8049 controllers.
This is not really a project of mine because it is designed by Atmel and it is used to program their AVR processors. I only include it here for my own reference and to show you how I've built mine.
If only I had received €1 for every I²C or IM bus EEPROM that was programmed using this project.....
It is rather an old project, and at first it was run on the Apple ][ computer at work. Later I wrote a program for the IBM PC and it still functions today, even on Windows XP machines!
This is not just a single project.
It is a collection of several more or less complicated projects which are all related to IR remote control applications.
For instance I've explained in detail how various IR remote protocols are decoded using a PIC processors.
One of the visitors of my web site notified me about the Nikon IR protocol used by the ML-L1 / ML-L3 remote controls for Nikon (D)SLR cameras. I simply had to build one for myself. All Nikon cameras which can be controlled by the original ML-L1 / ML-L3 remotes should work with this little project.
I managed to get hold of some of these display modules.
I'm using them for a variety of experiments.
The module is built around an SAA1064 I²C display driver and drives four 7 segment displays.
If you like creating programs for micro processor you can not do without an easy to use EPROM Simulator like this one, especially if you combine it with my SB-Assembler.
You simply connect it to the SB-Bus and the new program is sent to the Tiny EPROM Simulator every time you assemble your source code.
You may have noticed that I tend to build some intelligence into my projects.
Most of them are controllable through the SB-Bus.
The only thing you'll need is a suitable SB-Bus driver. Here you'll find some examples.
This simple UTP cable tester can track down cut, shorted and swapped wires in UTP cables. Actually it is rather a universal cable tester because with different connectors you can test the connections of just about any type cable you like.