Update after 3 months The UPS is functioning as it should, and I think the solution is viable as a simple, low cost UPS where it is needed. It was a good mind and build exercise, but there are two reasons why I am not keeping it: First – realistically speaking, electricity fails way too seldom to actually use it. Second, unless I build one of these for each room, I will always have to… Continue reading
Check out part 2, where the basil is watered automatically. Intro Part of my home automation system is monitoring the well-being of various other non-human species around the house. So i started with the plants. Since they are mostly fixed creatures and generally require only water input from humans, monitoring the soil humidity is a good start. How There are quite a few ways to measure how much water is in the soil, some of… Continue reading
Intro I spent quite a bit of time trying to design a digitally controlled power supply. I even have some prototypes and three articles, Part 1, Part 2 and Part 3. One day it hit me: across the years, I built multiple prototypes, spent a lot of time on it and never ended up anywhere. Why? because I did not really need one and I did not have any pressure to build one. So this… Continue reading
An in-depth view of the new PeakTech 6225A 30V 5A switch mode laboratory power supply showing very good results. Continue reading
How do you test a power supply? With an Analog Discovery controllable electronic load, of course! Continue reading
How do some topologies of power supplies perform? Find out! Continue reading
Some tricks to make your 3D printer more silent. Continue reading
A simple on-line 5V UPS for raspberry pi and others, using off the shelf modules. Continue reading
Simple way to guarantee correct driving of WS2812 from a 3.3V micro, without any special parts, just another WS2812 LED. Continue reading
How much standby power do your devices burn? I’m hacking an energy meter to be super sensitive and measure the tiniest vampire power. Continue reading