teuobk

Joined 18 years ago

Karma
1,897
Submissions
334
Member since
Jul 14
Hi!

Embedded development, among other things.

Blog: https://www.keacher.com/

Email: jeff.keacheratgmaildotcom

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Recent submissions

Comment · 8 months ago
Environment Canada assumes 60 km on their Weatheradio page ( https://www.canada.ca/en/environment-climate-change/services... ), so that's what I went with. Having said that, I very much agree that the range is probably considerably greater in many cases.
Comment · 8 months ago
Here's a map I put together of the Weatheradio (one "r"!) service coverage in Canada, assuming each station has a range of 60 km: https://www.keacher.com/files/dir12/weatheradio_map2.png Perhaps unsurprisingly, the coverage is most dense where the population density is also highest, with some exceptions.

And if anybody is curious, here's the coverage for the equivalent Weather Radio service in the United States: https://www.weather.gov/nwr/maps

Comment · 11 months ago
That was exactly my thought when reading the article and my personal experience with Covid. For a couple weeks, I perceived a persistent smell of something burning.
Comment · 1 year ago
Comment · 1 year ago
Comment · 1 year ago
Current evidence is that PSA tests don't actually save lives:

https://thennt.com/nnt/psa-test-to-screen-for-prostate-cance...

I wish they did, of course. I personally lost a close friend to prostate cancer last year. He was 41 and was, before the cancer, one of the healthiest and most athletic people I knew.

The first inkling he had that anything was wrong was a backache that wouldn't go away; a stage 4 diagnosis ensued. He held on for 21 months from the onset of symptoms before the cancer took him.

Comment · 1 year ago
Comment · 1 year ago
Goes back at least slightly before that, as I've had 2038epochalypse.com registered since March 2017, but I can't recall whether I thought I was being clever or whether I heard it somewhere else.
Comment · 1 year ago
Comment · 1 year ago
Awesome! I love seeing how the blocks are affected by twiddling bits.
Comment · 1 year ago
SEEKING WORK | Remote (based in Denver, Colorado, USA) EMBEDDED FIRMWARE and HARDWARE

Got an embedded programming or hardware design challenge you need solved? I'll solve it!

15 years of experience consulting, and I've seen it all; for the past decade I've been exclusively consulting independently. Past clients have included companies large and small, with everything from green-field ideas for new products to tricky situations with existing products they needed fixed. Comfortable working under regulatory constraints; many of the projects I've worked on have been medical devices.

C is my bread and butter on the embedded side, and Python is my go-to for developing PC utilities and scripts, but I'm comfortable working in a lot of languages from assembly all the way up to Javascript when needed. I can even patch embedded binaries by hand when needed.

Architectures? Well, these days it's mostly ARM Cortex, but I've done everything from 8051 and 6502 to STM8 to PIC16/24 to all of the modern stuff, plus a handful of really obscure things. Specific chip families that I've dealt with a lot lately include STM32, nRF5x, and PIC16, but again, I've successfully worked with MCUs from ST, Nordic, NXP, SiLabs, Renesas, Atmel, Microchip, and various other vendors.

Super comfy with Linux, though most of my practice is bare-metal or with true RTOSes.

Bespoke drivers need development? No problem. USB, I2C, SPI, CAN? Yup, all of those and more. BLE, LoRa? Expert. Power optimization for battery operation? That's a specialty of mine: I squeeze out every last nanoamp -- and quantify the improvement.

BS in EE. Designing analog and digital circuits, laying out PCBs, bringing up boards, debugging hardware, simulating designs (including EM simulations for antennas, transmission lines, etc.), and consulting on hardware improvements are all no problem. I have an extremely well equipped EE lab bench, including for RF out to 8 GHz, and am very comfortable doing fine-pitch soldering under a microscope as needed.

US citizen, masters from Stanford. Licensed professional engineer (PE) in Colorado.

Feel free to reach out and let's see if there's a good fit. Thanks!

[email protected]

Comment · 1 year ago
Comment · 1 year ago
Indeed. I've unsubscribed from all subreddits that have become infested with political content, and I've "unfollowed" all of my acquaintances on Facebook and LinkedIn who post anything political. So much more enjoyable.

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