zsellera

6 ms·

1.
Show HN: OpenStint – lap timing using RTL-SDR and near-field transponders(openstint.org)
3 points by zsellera 28d ago|0 comments
2.
by zsellera 4mo ago
It's been a struggle to allocate cost-optimized VPS at them for months now (in some regions), they were very often out-of-stock.
3.
by zsellera 4mo ago
RFID/transponder-based lap timing for RC-cars, using RTL-SDR/HackRF. https://openstint.org/ -- https://github.com/zsellera/openstint
4.
by zsellera 1y ago
Most companies have region-specific price lists. My Spotify subscription costs about 60% of what the same plan costs in the US (2200 HUF vs. 11 USD). In the electronics industry, everyone has a separate price list for China. Btw. the wester
5.
by zsellera 2y ago
What you "more bandwidth more noise" people miss is the difference in randomness: the noise is random while the signal is not. In case of gaussian noise, double the bandwidth means 1.41x more noise. For signal, double the bandwidt
6.
by zsellera 2y ago
The same essential skills make a great PO/business analyst as a great engineer: the ability to think in abstract terms and the ability to debug. When successful POs write a book or something, they present the best-practices. They don&#
7.
by zsellera 3y ago
After doing some math it doesn't feel like a ddos: - $104k at ($55 / 100 GB) = 189 TB of traffic - It means the popular ~3.5 MB media file was downloaded ~54M times - Which sound like a lot, but if you get popular in a country wit
8.
The Helium Network Is Surprisingly Awesome(kucu.io)
2 points by zsellera 4y ago|1 comments
9.
by zsellera 5y ago
There is a little to no consumer market for quality stuff (ppl buy based on price, maybe lm/W, maybe CRI95+). You'll see great LED installations at: - offices & commercial buildings, where it was designed by an engineer - med
10.
by zsellera 5y ago
If you ever wondered what makes LED lights feel great: it's the strategic mixing of LEDs with different characteristics. Here's a free tool that helps designing such fixtures: https://www.meerkatblog.com/ledmixing
11.
by zsellera 5y ago
The risk of an accident is much lower than the risk of full-on wars w/o them. Nuclear weapons are the reason I can raise my children in a relative peace.
12.
by zsellera 5y ago
This project is a great showcase of what whitelabel streaming providers can do. Back when Youtube and Netflix started streaming, it was a huge deal technically (codecs, infrastructure, cdn). Now companies like uscreen offer this at a flat r
13.
by zsellera 5y ago
So far Orban's regime is the only eu/western government involved in this scandal. I see that no surprise. There is no need of official government approval to conduct such surveillance. It's enough to have weak access contol t
14.
by zsellera 5y ago
Search ebay/etc for "EC/TDS meter", it's ~10 USD. Cheap ones do work, no worry. Keep your drain water at a stable EC, somewhere between 500 and 2500 uS/cm, and you're golden. If the drain water's EC
15.
by zsellera 5y ago
My experiences are different. I think most assembly-houses self-source some parts, and they do it in large quantities (like 1M+ parts/year). As such, they buy at extremely good prices. They overbuy themselves, and in order to get the s
16.
by zsellera 5y ago
LOL, no. It's hard to implement hardware functions in software if it's impossible to source the MCUs my software stack was built on. What's really happening is that I (and likely many others) realised that Chinese-brand chip
17.
Prezi's Auth Bug: Racing against race conditions (2014)(engineering.prezi.com)
1 points by zsellera 6y ago|0 comments
18.
by zsellera 6y ago
That waterfall doesn't look like any sensible digital modulation to me, or at least if I were doing HFT, the spectrogram would look totally different. I think the source is rather an unintentional radiator in this case.
19.
by zsellera 6y ago
Don't even try. Use docker, there are official pre-built images. It's easy: docker run -p 8888:8888 -v ~/Code/actual-project/:/home/jovyan jupyter/datascience-notebook Note ~/Code/act
20.
by zsellera 6y ago
This was the most disgusting thing I clicked on this month.
21.
by zsellera 6y ago
Somewhat. Make sure the metal case is earthed, and the case is the only point where earth and internal grounds are connected. Far field emissions rarely comes from pcb traces though. Memory (high speed) buses use amps of current on each tra
22.
by zsellera 6y ago
It's nothing new and is know in the community for a very long time. BfR scientists should rather focus on the safety of industrial injection molding, where the smell is barely bearable and rumor sais workers grow extensive fur.
23.
by zsellera 6y ago
I'm kinda into tomatoes: the same variety can result different taste and nutritional value (dry matter content) depending on the growing conditions. I know two greenhouse growers, growing the same variety of tomato on the same rootstoc
24.
by zsellera 6y ago
Just out of curiosity: the tone appearing is me connecting my CE-certified Dell computer to a CE-certified Asus router, using a standard cat5-e cable. https://ibb.co/0rxKq6L (CubicSDR ran on the same DELL machine, however b
25.
by zsellera 6y ago
I think what happens is the transformer inside the rj45 connector couples a litte of the differential mode signal (that should not radiate significantly) to all wires in the cable harness (common mode), which will radiate. You can select t
26.
by zsellera 6y ago
As someone recently participated in an EMC measurement, I really don't understand how anyone passes these tests without some kind of cheating (using double-shielded, very expensive industrial cables + hacking with functional earthing).
27.
by zsellera 6y ago
I recently took an email-course on blogging for devs. One of the key points were to use your own domain, and the course showed a few tricks about creating traffic there. If you're interested, here is it: https://bloggingford
28.
by zsellera 6y ago
You can decrease such risks by mixing carbonate minerals (calcium-carbonate and magnesium carboante) into the AN fertilizer, as done in EU counties (and probably in the rest of the world as well).
29.
by zsellera 7y ago
that's per a single tomato plant, summer time. I guess it's the same for any greenhouse crop, see the reasoning here: water use is necessary to manage internal climate. the greenhouse was designed to keep heat inside. the plants h
30.
by zsellera 7y ago
As someone working in the greenhouse lighting industry, I might have some insight on this: 1. there is an existing technology called energy screen/curtain, with the primary function of retaining heat, but can also reduce light pollutio

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