Henrik Carlsson's Blog

All things me.

posted this note on and tagged it with Covid infected?

I just realized I left the story of covid-19 in the family unresolved, and that I haven’t blogged for over a month. Anyway, I got a total of two tests while Linn was covid positive but both my tests came back negative. I’ve been meaning to get an anti-body test but haven’t gotten around to that (yet?). So it’s quite possible that I didn’t have covid. All we know is that Linn had it, that Iris might have had it, and that I maybe possibly had it.

Linn got better after a few days and hasn’t had any long term effects, so we seem to be in the clear.

Now spring is here and the summer seems to be right around the corner. Lot’s of things to do.

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posted this note on and tagged it with ΠiFi Music Player

The first day with the πiFi was a great success yesterday. The kids caught on to how it worked immediately and listened to a lot of music.

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posted this note on and tagged it with ΠiFi Music Player

Finally, I have the first proper beta of the πiFi Music Player working. The enclosure is 3D printed and fits nicely and the software works more or less. Tomorrow I’ll ”release it to the public” (aka the kids) and see what happens.

The πiFi with an older version of the top case in the background.
The πiFi with a QR code in place
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posted this note on and tagged it with 3D printing

This large wall hook 3D model is really useful and has helped me clean up the power chords on the side of the house where we park the cars.

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posted this note on and tagged it with 3D printing

On a much more fun note, the 3D printer is turning out to be a great purchase. I currently feel that every problem, expect maybe Covid, can be solved by the correct 3D model and the right amount of print time. :)

Also, Fusion360 runs great on the M1 MacBook Air.

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posted this note on and tagged it with Covid infected?

Covid update day three,

Linn keeps feeling quite well. Iris keeps coughing and sneezing and I feel worse today than yesterday. Sore throat, lot’s of snot and generally tired. Still not too bad, though.

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posted this note on and tagged it with Covid infected?

I took a covid-test (far from my first) the other day and got a negative result yesterday. Linn got her result today and it was unfortunately positive. So Happy Easter I guess…

(We all feel quite fine at the moment.)

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posted this note on and tagged it with Mac

A while back I wrote about what new Mac laptop to get as my main work machine. Writing that text really helped because later that same day I came to a decision and ordered the M1 MacBook Air. It should arrive in a few weeks so I hope my beat up 15″ Pro keeps it together until then.

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posted this note on and tagged it with Narrating my work ΠiFi Music Player

The second attempt at 3D printing a base plate for the πFi went much better but there’s still plenty of room for improvements. Currently I’m testing out sizes for the QR cards and how those sizes effects the necessary distance between the cards and the camera, which in turn effects how large the whole device will need to be. Currently I’m leaning toward a 7,0×8,5 cm large card with a 5,5×5,5 cm QR code centered on the card and this means that the full enclosure doesn’t need to be any bigger in the base than the Pi itself is.

If stand for the QR cards are on top of the USB och Ethernet ports with just a couple of mm of plastic between them, the camera sensor need to be about 55 mm above the surface of the Pi.

Tidbits

If I connect a display to the Pi I can use raspivid to display the output of the camera on that display. The display needs to be connected to the Pi but the command itself can be run either locally on the Pi or remotely via SSH.

For example: raspivid -o video.h264 -t 180000 -w 640 -h 480 will display an image for three minutes, showing the same that the QR Reader script will see.

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posted this note on and tagged it with 3D printing Narrating my work ΠiFi Music Player

Turns out there where multiple problems with yesterdays attempt at a base plate for the πFi.1 I had the measurements for the QR cards completely wrong, so even if the Pi had fit it wouldn’t have worked.

This morning I drew up a quick 2D sketch in OmniGraffle and then I worked from that one to get the 3D version in Fusion. Hopefully this one will work better. The printer says about six hours to print.

  1. Note to self: Make up my mind whether it’s πiFi or πfi. ↩
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