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Designing and 3D printing a lamp
Since I got a 3D printer, I have done the obligatory amount of downloading other people’s models and printed them out.
But I wanted to try my hand at the “whole process” - designing and printing a 3D object. I also wanted it to be something practical.
These LED strip controllers are very cheap and highly available (on Aliexpress and
similar).
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Unmarshaling arrays of disparate items
Creating a custom UnmarshalJSON to handle arrays of disparately typed objects.read more
Charging an EV for free - part 2
In part 1 I described the fundamental principle of the system – the inputs and outputs to the system and the concept of having a control loop to maximise the charging power without exceeding the amount of excess energy available.
I’ll let you in on a little secret – at that point I didn’t even have an EV yet. I was still waiting on delivery. I had the charger though, and I wrote a …
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Charging an EV for free - part 1
The solar landscape has changed in Australia.
In the boom days of solar, there were extensive and lucrative reasons to invest in solar power for the home. The FIT (Feed In Tarrifs) were so high (ludicrously so, really) with enormously long tenures, that getting solar was a no-brainer.
Not that I’m arguing that that was a bad idea. It has made us a nation where home renewable power generation …
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So you know X and you want to learn Go?
Learning Go, from the viewpoint of a dynamic language programmerread more
Embedded SQL migrations with jackc/tern
tern is a powerful standalone SQL migration tool, which I’ve used quite a bit in the past.
I’ve always treated the migration as a separate step - deploy the application and then perform the migration. This requires me to potentially move the schema migrations files around, or run the migration via an ssh tunnel or similar.
One of the advantages of golang is being able to ship a single …
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For loops with consistent timing
“Do a thing, sleep a while, repeat” is an extremely common paradigm. Here is how that concept is typically expressed:
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htmx, embedded assets and html/template
htmx is a new javascript framework that tips the typical front-end development paradigm on its head. A typical webapp these days looks like:
- backend, implementing business logic
- a transport layer (REST endpoints, serving JSON)
- a front-end in javascript
While this has become the defacto model for front-end development in 2022, there are some problems with this approach:
- You need two different …
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SSO for your homelab
At one point all of us homelabbers (remember when there wasn’t a dedicated name for people like you and me who just wanted to run cool things at home?) want access to their web application resources from the outside world.
This is easy enough, of course. Port forward, you’re done. However these simple solutions can be pretty clunky for a variety of reasons:
- bad URL’s like …
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encoding/gob with wire encryption
The various io.* interfaces (such as io.Reader and io.Writer) are often touted as a golang “killer feature”, though once you are familiar with interfaces you realise there is not much to them. The beauty is in the simplicity.
When I first looked at the encoding/gob I was slightly peturbed by the requirement to provide a io.Reader (to the Decoder) and an io.Writer (to the Encoder). It …
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