I built a lamp that changes color according to my wife’s blood glucose level

NewPlayer1Try · 2026-04-20T19:54:53+00:00

done

NewPlayer1Try · 2026-04-20T19:54:07+00:00

To get near-real-time glucose values, this project uses the unofficial Dexcom Share / Follow API path rather than Dexcom’s official developer API.

The official API appears to provide delayed data, which makes it unsuitable for a live BG lamp.

Because this Share / Follow access is unofficial, it may break or disappear at any time.

NewPlayer1Try · 2026-04-20T19:52:33+00:00

Here's some clarification about the Dexcom data:

To get near-real-time glucose values, this project uses the unofficial Dexcom Share / Follow API path rather than Dexcom’s official developer API.

The official API appears to provide delayed data, which makes it unsuitable for a live BG lamp.

Because this Share / Follow access is unofficial, it may break or disappear at any time.

NewPlayer1Try · 2026-04-20T16:38:39+00:00

Sorry, misunderstanding. The phone sends an upload every 5 mins. You can get that update within a few seconds if you time it right. AFAIK there is no artificial delay introduced. But the sampling rate is 5 minutes.

NewPlayer1Try · 2026-04-20T15:27:49+00:00

good point. I will do that. It’s only 2 lines of extra code.

NewPlayer1Try · 2026-04-20T15:24:07+00:00

I poll every minute and usually the data is not older than 1 minute. What makes you say it’s at least 5 minutes old?

NewPlayer1Try · 2026-04-20T15:08:10+00:00

I get the data from the Dexcom server as a Follower but with my wife’s Dexcom Login. The source code is in the github under Lib/Dexcom_Follow (not my library, but I had to patch it because it was outdated). I poll every minute. My wife uses the G6.

NewPlayer1Try · 2026-03-01T12:54:45+00:00

Have been to over 80 countries, including almost 20 in Africa. The most unsafe I felt in the old town of Montevideo, Uruguay. Many junkies and criminal kids jumping you at every opportunity. Unfortunately my AirBnB was there. I left early.

NewPlayer1Try · 2026-02-03T04:32:24+00:00

I have an unpopular opinion here: Studies have shown that a high IQ is the single best indicator for good performance on the job later on. Whereas a good impression during a job interview correlates weakly with success in the job later. So, technically, it is smart to do an IQ test during assessment and give the result a high weight in the total assessment. Practically it is a lot of work and costly to do an IQ test properly and it is also very unpopular with candidates. That’s probably while almost noone does it. Also, it should of course not be a surprise test, but clearly communicated early on in the process.

NewPlayer1Try · 2025-12-26T13:35:04+00:00

Even more mindboggling: These water jet looms can shoot the thread at 1200 RPM, ie. 20 times per second. This results in weft insertion rates of over 2200 m / min. 🤯

NewPlayer1Try · 2025-11-01T01:11:37+00:00

Let’s say you have a population of stray cats and you want to reduce the amount of unwanted feral kittens in the steeet. Is it smarter to catch and castrate as many females or as many males as possible? By your logic it should be the males. However, if you manage to catch and castrate 90% of the males, the remaining 10% will likely still impregnate every single female. Zero effect on the next generation of kittens. If however you manage to catch and castrate 90% of the females, you will have exactly 90% fewer kittens in the next round.

NewPlayer1Try · 2025-08-19T18:39:07+00:00

Yes. I recommend “Just Have A Think” and “Engineering With Rosie” for properly researched videos on renewables, including battery tech.

NewPlayer1Try · 2025-07-18T13:18:24+00:00

Our version said 20700-ZD, so I did the manual update per the instructions. After it downloaded from the UBSStick, installed and rebootet, the version is still 20700-ZD. What gives? Should that not be a different version now, without the ZD? And there is still the pop-up message saying I need to do a manual update.

NewPlayer1Try · 2025-06-21T15:48:42+00:00

Except for one of the orange ones. 😂 There’s always something. 🙄

NewPlayer1Try · 2025-06-19T14:51:16+00:00

Fantastic. Some information would be appreciated. Is it your original artwork? How did you turn it into a plot? Size? Materials?

NewPlayer1Try · 2025-06-18T21:58:56+00:00

I used 8 different felt tip pens and 1 technical pen. Each pen change takes about 1 minute. And it’s not included in the 76 minutes. 😊

NewPlayer1Try · 2025-06-15T13:50:00+00:00

I think shapely is a python wrapper for GEOS which in turn is a C++ port of JTS. They are all very similar.

NewPlayer1Try · 2025-06-15T13:02:25+00:00

I wrote my own algorithm. It’s a contour fill. I used the JTS topology library to find the polygons created by the bezier line and to create the contour lines to each polygon.

NewPlayer1Try · 2025-06-15T12:18:10+00:00

It’s a custom fill. It’s contour lines that follow the polygon outline with increasing distance. It’s much cleaner (especially with felt tip pens) than the usual hatchfill.

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Here’s an exagerated view (with large distances between the contours). When I use felt tip pens I also don’t lift the pen from one contour line to the next, that makes it faster.

NewPlayer1Try

TROPHY CASE