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cadr

470 karma · joined September 9, 2009

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cadr··on FDA clears first over-the-counter continuous glucose monitor
https://www.massdevice.com/dexcom-direct-to-watch-g7-cgm/

(There is already an app to show on the watch, but you still need the phone in the loop - this is directly to the watch without the phone.)

cadr··on FDA clears first over-the-counter continuous glucose monitor
I just started with the G6 (still using it), and when I started I'd have that sometimes. Whatever they changed in the past year or so, it has gotten waaaaay better. (They would always replace them if they failed early, but was still a huge pain.) I'm exited to move to the G7 (mainly because of the shorter warmup time).

Also, pairing it with the Omnipod 5 is just next level. Closed loop. Never having to inject in public. No tubes.

cadr··on Show HN: NotesOllama – I added local LLM support to Apple Notes (through Ollama)
Hm. Now getting "ERR_SSL_PROTOCOL_ERROR" in Chrome on OSX.
cadr··on Show HN: NotesOllama – I added local LLM support to Apple Notes (through Ollama)
Seems hugged. Look forward to looking at it when the site is back up - I want this exact sort of thing.
cadr··on TinySA – small spectrum analyzer and signal generator
Well, they are different tools for different situations.

I found, for what I do, having a vector network analyzer was more useful that having a spectrum analyzer. Specifically, measuring the SWR of antennas and measuring the resonance frequency of filters.

cadr··on TinySA – small spectrum analyzer and signal generator
I narrowed it down to something around my next door neighbor's house. The issue was there was something broadcasting a signal that covered the same range that my car key fob did, so I couldn't lock/unlock my car unless I was right up on it.

But the signal was intermittent, and I talked to all the neighbors in all three units, and none had anything that sounded like it could be the culprit. It eventually just stopped happening, so I never tracked it down.

cadr··on TinySA – small spectrum analyzer and signal generator
The TinySA is kind of like a tiny radio, just tuning through the channels and measuring how loud at each frequency. And it managed to leverage an exiting chip (designed for other purposes), which is how it got to be so cheap.

This is a great explanation of the signal path: https://www.youtube.com/watch?v=z63cXhYzS1A

cadr··on TinySA – small spectrum analyzer and signal generator
What frequencies, how many channels of analog/digital, what bit depth, how much memory, etc? What is your actual application? And what do you mean "PC attached" here? What is your budget?

I don't think you are going to find much for less than a Picoscope.

Maybe something like the Analog Discovery 3? Under 400 USD, 2 channel oscilloscope (30 MHz), 16 channel digital, 2 channel arbitrary waveform generator (12 Mhz) https://digilent.com/shop/analog-discovery-3/

Rigol and Siglent both make mixed signal scopes that will do two channels analog at 100MHz and 16 channel digital for ~1k USD.

cadr··on TinySA – small spectrum analyzer and signal generator
I wish I had it when I was having an RFI issue in my neighborhood. I ended up with my RTL-SDR hooked up to my mac with a homemade copper-on-tape-on-cardboard yagi, and I looked like I was a tinfoil hat away from being needing to be put away.

Still would have looked nuts with the TinySA, but... less so.

cadr··on TinySA – small spectrum analyzer and signal generator
A real thing: https://en.wikipedia.org/wiki/Spread_spectrum

Fun fact, the famous actress Hedy Lamarr actually was instrumental in inventing it!

cadr··on TinySA – small spectrum analyzer and signal generator
It surprises me that military drones aren't using spread spectrum to make this harder.
cadr··on Lightweight woven helical antenna could replace field-deployed dishes
Great find - thanks for sharing!
cadr··on TinySA – small spectrum analyzer and signal generator
That's cool - didn't know that about Android.

Another cool tip is to use NanoVNASaver (https://nanovna.com/?page_id=90)

cadr··on TinySA – small spectrum analyzer and signal generator
For sure - if you can afford them, get both. I was just surprised because I expected to use the SA a lot more when I got it. But I am mostly either testing filters are designing antennas, and the NA is the way to go.
cadr··on TinySA – small spectrum analyzer and signal generator
Make sure to heed the maximum input and use an attenuator!

These are very cool and fun, but I found myself using my NanoVNA a lot more than my TinySA

https://nanovna.com/

cadr··on Lightweight woven helical antenna could replace field-deployed dishes
This guy recently made a neat roll-up antenna for 2m using "faraday cloth"

https://www.youtube.com/watch?v=X7K6DNLD9Wo

cadr··on Computer Engineering for Babies (2021)
I got this - I loved the idea of it. But my younger kid was on the edge of the age for it and outgrew it quickly. So now a friend's kid is enjoying it.
cadr··on Seven great but notoriously hard-to-finish books
The man could write, but... Maybe you just have to be in the right mood.

Reminds me of this onion article: https://www.theonion.com/girlfriend-stops-reading-david-fost...

cadr··on Seven great but notoriously hard-to-finish books
I know a lot of people that bought Infinite Jest but I think only one that finished it...

The never-ending footnotes did amuse me though.

cadr··on Seven great but notoriously hard-to-finish books
Are you talking trash about Garth Marenghi?!
cadr··on From Nand to Tetris (2017)
My favorite thing about the book is that each section builds on things, but you don't have to go through the whole thing to get there. So, for example, if you did a lot of hardware in the past but never got around to writing a compiler, you could in theory start there. Or if you did a lot of software before but never actually built an ALU, etc, you can get a lot out of just doing the hardware sections.
cadr··on Seven great but notoriously hard-to-finish books
I don't understand how "One Hundred Years of Solitude" or "Catch-22" are on here. Maybe you just have to be at the right place in your life, but I just plowed through those in college.

I've never gotten around to reading "A Brief History of Time", but I still hold out delusions that I'll get through "The Road to Reality" by Roger Penrose some day.

cadr··on Rough.js: Create graphics with a hand-drawn, sketchy, appearance
I remember using some Java "napkin" look and feel years ago. Really great for getting the idea across that this really is a prototype and I didn't just finish all the work in 30 minutes.
cadr··on Infocom’s code-porting tools for Zork and other games have been found
Is that something you've done before? What is involved in doing that? Sounds interesting.
cadr··on My insulin pump controller has a bug
Do you know what version of the app you have? I've not been able to reproduce it yet on 1.0.91 (Following the steps as I saw at https://twitter.com/Tims_Pants/status/1730515134731182490)
cadr··on (learn 'scheme)
The entire instruction of Scheme in 6.001 was less than an hour. You only need a tiny bit and then you can focus on the concepts in the book rather than quirks of some programming language's syntax. I think that is a huge win. On what basis do you find it "intellectually dishonest"?
cadr··on AMPKT – Amateur radio packet explorer
HackRF One is an option. There are a number of others. Legality varies by country/frequency/power level.

Can also make a Raspberry Pi act as a transmitter (https://github.com/F5OEO/rpitx), which could hit the zwave frequency but not the zigbee one. (Also, make sure to put a low pass filter on it.)

cadr··on Ray and Tom Magliozzi, MIT 1999 Commencement Address [video]
I remember quite a few people annoyed that we weren't getting some more famous speakers, but I grew up listening to Car Talk and I was over the moon.
cadr··on A DIY ‘bionic pancreas’ is changing diabetes care
I love my omnipod/dexcom combo so much.
cadr··on Predictive Debugging: A Game-Changing Look into the Future
That was amazing.
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