In a previous blog post I wrote about a monitoring solution I built for the hot water heater in my house. It was needed because of the heater switching off occasionally by itself. While the monitoring solution worked fine, it was of limited use, since all you could do was just check after the fact… Continue reading SMS alerts for temperature monitoring solution
Author: amplifier
Temperature monitoring solution based on Raspberry Pi
My house is heated by an ancient ground source heat pump that every now and then has had various problems. Being a 40-year-old piece of equipment, it doesn’t have any of the electronics that all the new heat pumps come with. Since getting data about the operation of the pump is always useful when trying… Continue reading Temperature monitoring solution based on Raspberry Pi
Fruit and vegetables
Here’s a handy reference chart telling what the thing we call “fruit” and “vegetables” actually are:
Carcassonne tile counter v3
Better late than never, they say. Someone requested some new features to my Carcassonne tile counter years ago, and I finally managed to do something about it. Here’s the latest version: Carcassonne tile counter version 3. What changed? Quite a few things: – The whole app is now written in frontend Javascript, so there’s no… Continue reading Carcassonne tile counter v3
EC2 instance creation fails with “InvalidParameterCombination: The parameter groupName cannot be used with the parameter subnet”
For the second time I ran into this same issue. When using RunInstancesCommand from the AWS SDK for Javascript, a certain parameter combination results in a misleading and confusing error message: “InvalidParameterCombination: The parameter groupName cannot be used with the parameter subnet” There is no parameter “groupName” in my request. The problem was that the… Continue reading EC2 instance creation fails with “InvalidParameterCombination: The parameter groupName cannot be used with the parameter subnet”
Finnish public holidays
There are a number of public holidays in Finland, many of which are paid vacation days for most people. Some of these holidays are observed on a certain weekday near a calendar date, such as Good Friday, Easter Monday, Ascension Day(Thursday), and Midsummer’s Eve(Friday). Other observed Christian holidays are always observed on the weekend, so… Continue reading Finnish public holidays
Fallout Pip-Boy 2000 Mk.I replica – Part 5: Electronics and software
The Pip-boy project has finally been finished, after a bit of a hiatus. The last things that needed doing were finalizing the electronics, and writing the software. My original plan was to just use a Raspberry Pi to power the whole thing, but it turned out that dealing with the inputs from the physical buttons… Continue reading Fallout Pip-Boy 2000 Mk.I replica – Part 5: Electronics and software
A story of a web server installation
A recent interaction with AWS support reminded me of something that happened to me and a co-worker some years ago in a previous job. The people and companies in the story have been anonymized, but I’m “Eric”. I (“Eric”) worked for the online development team of a large media company (The Company) “somewhere in Europe”.… Continue reading A story of a web server installation
Fallout Pip-Boy 2000 Mk.I replica – Part 4: Very small details
I’ve noticed before that this build has some issues with scale, but now it’s really hitting home. Some of the details are ridiculously fiddly. Starting with the faux vacuum tubes; Not too bad, just smaller than any real vacuum tubes would be, and even then they aren’t actually fully shown from behind the grill.