Halldór Stefánsson

Research & Development | Software + Electronics + Classic Cars | 1972 MGB GT

[Halldór Stefánsson @HalldorStefans]

https://t.co/wvrIv70dXe

[Halldór Stefánsson @HalldorStefans]

First iteration of my car-maintenance logbook app (Tala) was like a small SaaS, with auth, PostgreSQL, etc. I never used it or worked on it. For the second iteration I'm going local-first with SQLite on the device. The idea is to make easier to develop, deploy and use.

[Halldór Stefánsson @HalldorStefans]

Just finished the first iteration of this car-maintenance logbook app I’ve been tinkering with.
I’m awful at keeping track of what I’ve done on the car, so I figured it was a good excuse to finally try some mobile dev.

[Halldór Stefánsson @HalldorStefans]

Picked up the battery monitoring project again. Migrated from Arduino to C++/PlatformIO, with AI, which went well. Last time I hit a weird problem: 3.6V Zener clamp on the ADC input is causing 12V to read as ~7.3V. Need to verify if that's still the case.

[Halldór Stefánsson @HalldorStefans]

Building a small vehicle telemetry service for my own amusement using open-code to do majority of the code. Been quite fun. I review, ask for changes or explanations, and ask for a review and select the ones I want. Also good for learning, to explain code, tech, etc.

[Halldór Stefánsson @HalldorStefans]

If you're coming from backend stuff like Go and want to dip into mobile, Flutter’s worth a try. Also from Google, doesn't feel bloated, and the docs are solid. Hard to explain but everything just... clicks, especially for small apps.

[Halldór Stefánsson @HalldorStefans]

Just finished the first iteration of this car-maintenance logbook app I’ve been tinkering with.
I’m awful at keeping track of what I’ve done on the car, so I figured it was a good excuse to finally try some mobile dev.

[Halldór Stefánsson @HalldorStefans]

Built the backend in Go, and I went with Flutter/Dart for the app.
First time using it and honestly it’s been fun. LLMs seem to know the stack really well too, which made bug-hunting and adding features way easier than I expected.

[Halldór Stefánsson @HalldorStefans]

Used AI to analyse and organise the work to be done for my car logbook app. Provided it with the backend and frontend (using repomix). Kind of cool it was able to:
- find a field mismatch in the API between the repos
- suggest a UX improvement
- help me prioritise things to do

[Halldór Stefánsson @HalldorStefans]

Just added the option to add images. One for the car and multiple for each job. I'm quite happy with this. It was simpler than I thought with the image_picker library in Flutter.

[Halldór Stefánsson @HalldorStefans]

UI updated ✅

[Halldór Stefánsson @HalldorStefans]

Finally got some time to do the service record flow. Next up is updating the UI

[Halldór Stefánsson @HalldorStefans]

Basic vehicle management flow in place. Next up service management and then polish the UI a bit

[Halldór Stefánsson @HalldorStefans]

Register/login/logout flow in pace

[Halldór Stefánsson @HalldorStefans]

Flutter up and running on my device

[Halldór Stefánsson @HalldorStefans]

I'm developing a car maintenance logbook for my own use and to learn mobile development.
Wrote a couple of words on the start, the tech stack, reasons why and what the MVP will look like.

https://t.co/qviGkGT2pC

[Halldór Stefánsson @HalldorStefans]

New car idea. Only available with boring technology. The capabilities are well understood, as well as their potential failures. No surprises. Nothing new and exciting.

[Halldór Stefánsson @HalldorStefans]

Also added reverse polarity protection with a MOSFET and a zener diode.
But, I'll admit that I'm afraid to test it 😅🫣

[Halldór Stefánsson @HalldorStefans]

Added a buck converter (decreases the voltage) to be able to power the microcontroller from the battery and everything is looking good.

[Halldór Stefánsson @HalldorStefans]

Got an adjustable power supply and after changing the resistors and some adjustments, I'm able to get pretty constant 12 V measurements. Happy with for now.

[Halldór Stefánsson @HalldorStefans]

Got data coming through from the microcontroller to the app via Bluetooth.