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Willem Pennings

Willem Pennings
Fixing my heating system The heating system in my apartment building consists of a group of heat pumps that deliver warm...
10 months ago
47
10 months ago
The heating system in my apartment building consists of a group of heat pumps that deliver warm water to the underfloor heating system of about a dozen apartments, including mine. During the warm summer months, the system supplies cool water instead. The heat pumps figure out...
Willem Pennings
Balancing cube This cube manages to balance itself on a corner, and can simultaneously rotate around its axis in a...
a year ago
26
a year ago
This cube manages to balance itself on a corner, and can simultaneously rotate around its axis in a controlled manner. It does so using clever controls and a set of three reaction wheels. The original idea for this device comes from researchers at ETH Zürich, who demonstrate...
Willem Pennings
ClockSquared improvements My ClockSquared project has a long history – it goes all the way back to 2015, when it was simply...
over a year ago
18
over a year ago
My ClockSquared project has a long history – it goes all the way back to 2015, when it was simply called the “Birthday word clock”. I haven’t spent much time on the project in recent years, but I’ve upgraded the internals a while ago and finally felt like writing a post about it....
Willem Pennings
Home Assistant-compatible air quality sensor I recently moved and our new home is equipped with a ventilation system that distributes fresh...
over a year ago
16
over a year ago
I recently moved and our new home is equipped with a ventilation system that distributes fresh (outside) air through the house and recoups heat from the air that is exhausted. There is a problem with this system, though. Sometimes, for example when a neighbour lights their wood...
Willem Pennings
ClockSquared Mini, a word clock wristwatch About a year ago, I had some time to spare over the summer and decided to challenge myself with a...
over a year ago
12
over a year ago
About a year ago, I had some time to spare over the summer and decided to challenge myself with a project that I call “Clocksquared Mini”. It is Clocksquared, but in a tiny wristwatch package. This gives rise to a major challenge, as everything has to be shrunk down approximately...