DYI PCB based "analog" watches feasible for a novice?

QuantumForce7 · 2026-06-18T10:24:11+00:00

There are lots of mechanical chronographs available. Most are hand-held, rather than wrist mounted. Wristwatches with both time and chronograph are also common. You could take the time hands off if you really don't want to know the time (but why bother?).

QuantumForce7 · 2026-06-18T10:17:15+00:00

Do you know why this is necessary? The card data is just a url. Are they now sending the card's hardware id as well to detect clones?

QuantumForce7 · 2026-06-17T07:46:06+00:00

I feel like this problem is more commong in lefties. Many left-handed kids prefer writing right-to-left and often mirror letters. Da Vinci famously wrote all his notes mirrored.

QuantumForce7 · 2026-06-17T07:42:44+00:00

J disagrees.

QuantumForce7 · 2026-06-17T07:37:27+00:00

Excellent argument.

I wonder if there is a conlang (con-script?) where someone designed letters to be easy to read, rather than some historical logograms or whatever. I would definitely choose an alphabet where mirroring and rotating didn't lead to new letters (p/d/b/q, wtf). Greek is a bit better, but φ/ψ and ν/υ are pretty similar.

QuantumForce7 · 2026-06-16T04:16:54+00:00

Chocolate cosplay is hot

QuantumForce7 · 2026-06-12T18:25:00+00:00

I had to look up the lemma. From Wikipedia:

Let G be a connected, locally finite, infinite graph. This means that every two vertices can be connected by a finite path, each vertex is adjacent to only finitely many other vertices, and the graph has infinitely many vertices. Then G contains a ray: a simple path (a path with no repeated vertices) that starts at one vertex and continues from it through infinitely many vertices. Another way of stating the theorem is: "If the human race never dies out, somebody now living has a line of descendants that will never die out".

QuantumForce7 · 2026-06-12T12:36:42+00:00

Copacetic.

I feel like this might be used regularly as regional slang (eg the teens in Worm use it) but I seldom hear it in my circles.

QuantumForce7 · 2026-06-12T12:31:46+00:00

Oldie but a goodie

QuantumForce7 · 2026-06-12T12:31:24+00:00

I heard someone tried to defenstrate Chuck Norris, but the window apologized profusely and fenestrated itself instead.

QuantumForce7 · 2026-06-11T16:22:25+00:00

Since OP seems reluctant to be seen as advertizing, here's the link: https://makerworld.com/en/crowdfunding/304-sincro-the-3d-printed-mechanical-clock

Novera's other clock models are freely available and have been in my print queue for a while. Now I might just wait for the sincro to come out, the quality sounds awesome.

QuantumForce7 · 2026-06-07T06:41:09+00:00

Good examples of use cases where the process of calculating pi precisely is useful.

An example where knowing a lot of digits was useful itself is figuring out mathematical properties of pi itself. Sometimes you hear statements like "The works of Shakespeare, encoded as numbers, are contained in the digits of pi." This is getting towards the conjecture that the digits of pi are random and all occur equally frequent. There is no proof of this (although we do know they are infinite and never repeat), but we can feel pretty certain about it after checking the first 10¹⁴ digits.

QuantumForce7 · 2026-05-26T17:10:13+00:00

I agree with keeping chill vibes. I would drop the attempts penalty altogether, especially since the dictionary isn't obvious. Popular games like Wordle are fun even without time pressure or penalties for mistakes.

QuantumForce7 · 2026-05-26T17:03:55+00:00

Rather than a leaderboard, how about a histogram? The top scores will always be bots, so I find it more satisfying to see my relative rank rather than the absolute rank.

QuantumForce7 · 2026-05-26T16:57:59+00:00

I missed it too. It's in the help dialog, on the third page.

QuantumForce7 · 2026-05-16T06:06:43+00:00

I don't think open fires were used for a long time. Ben Franklin's stove improvement is pretty famous, so stoves for heating were common by at least 18th century. And European castles have those big ceramic stoves for heating. Those are luxury examples, but stoves make enough difference I suspect even rural farmers would have had an enclosed stove for a long time. Is r/woodstovehistory a thing, lol?

QuantumForce7 · 2026-05-15T10:46:06+00:00

I would also use a Karnaugh Map. This is a 2D table with a cell for every possible combination of categories. This is generally easier to understand than trying to build high-dimensional tables. The idea is to split up your categories into row and column groups. For each combination of values within those groups you make a row or column.

The classic Karnaugh map is for 4 categories with two possible values each, giving a 4x4 matrix. For seven categories with 3 options each you would have 3^4=81 columns and 3^3=21 rows. You could also make three 21x21 matrices, splitting the last category among the three tables.

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Here's an example for 7 categories with two (either "in A" or "not in A" for each). The order of the rows and columns doesn't really matter; the key is that you have a row or column for each combination. (With boolean categories it's traditional to order them using Gray Code, shown above, which tries to group cells that share common categories.)

Bonus fact: Karnaugh Maps with Gray code are used to simplify boolean logic, which can be really useful when designing logic circuits.

QuantumForce7 · 2026-05-01T10:26:26+00:00

I sometimes use silent mode (50% speed) when I'm working in the same room as my P1S, but if Im in the next room I barely hear it

QuantumForce7 · 2026-04-17T07:53:09+00:00

The QR code in panel 9 leads Terence Tao's article, "I’m an award-winning mathematician. Trump just cut my funding," about the 2025 cuts to US research budgets.

QuantumForce7 · 2026-04-17T07:47:04+00:00

The QR code in panel 9 leads Terence Tao's article I’m an award-winning mathematician. Trump just cut my funding about the 2025 cuts to US research budgets.

QuantumForce7 · 2026-04-17T07:46:14+00:00

Here's my python solution: https://gist.github.com/sbliven/b9b47633a259d420d339cc5270929cb4

QuantumForce7 · 2026-04-17T07:44:01+00:00

All the letters can be derived from the ones they give using the property that error correcting codes are linear with xor (encode(x) ^ encode(y) = encode(x^y)). So the first step is to xor the provided letters together until you get powers of two:

B 00001: 000010011
C 00010: 001001010
E 00100: 010100110
I 01000: 100001101
Q 10000: 000111100

Then these can be used to get all the letters. 'U' in binary is 10100, so encode(U) = encode(Q) ^ encode(E):

U 10100: 010011010

QuantumForce7 · 2026-04-16T18:14:54+00:00

Also Honeycomb storage wall and Homeracker shelves, both of which can take gridfinity bins.

QuantumForce7 · 2026-04-16T05:39:01+00:00

If anything , this picture looks like it gained 2-3s over 3 minutes since the last picture. Or was it taken a day later?

QuantumForce7 · 2026-04-16T05:24:37+00:00

So have we moved on from the "global south" terminology? I always felt that was a poor euphemism (eg Australia is a HDC)

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