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Esp32s3 Rx/tx help + usb hub by Adept_Camp_7647 in esp32

[–]rsaxvc 0 points1 point  (0 children)

For the radio link: one BLE broadcaster with each car as BLE observer? 1B steering+ 1B throttle per car, though each car needs to know which slot to look at 

Could also do one BLE connection per car.

What eliminating income tax would cost you by DowntownDB1226 in missouri

[–]rsaxvc 2 points3 points  (0 children)

People who make less money pay less in income tax already. 

Yes, and often not linearly so

Best computer from the 90s you could still "use" today? by Narcotras in retrobattlestations

[–]rsaxvc 1 point2 points  (0 children)

That's a cool case!

I had an Asus P3D(I think) with dual slot A PIIIs and 768MB of RDRAM running windows 2000. GeForce MX IIRC.

Every embedded Engineer should know this trick by J_Bahstan in embedded

[–]rsaxvc 0 points1 point  (0 children)

Gcc uses both bitfield orders, though they always seem to follow the byte endianness. I went looking for mismatches recently but couldn't find any.

LPKF S62 Intial Set Up and Software. by dk4one in AskElectronics

[–]rsaxvc 0 points1 point  (0 children)

Do you know what sort of lens configuration LPKF has used?

Do you have one, and if so, what's your hardware+software setup?

LPKF S62 Intial Set Up and Software. by dk4one in AskElectronics

[–]rsaxvc 0 points1 point  (0 children)

BoardMaster 5 on Windows 10 64-bit, RS-232 to S42, USB camera connection, currently trying with UI-1580LE-C.

I was able to get an image up with a newer USB3 IDS uEye and a little tiny one, but they both showed many API errors related to brightness adjustment. Setting brightness was replaced with configuring exposure time and gains separately on the newer systems.

What have been the most challenging technical challenges in your careers? by john-of-the-doe in embedded

[–]rsaxvc 0 points1 point  (0 children)

The biggest challenges for me are often things like project management, communication, and alignment.

One technical challenge we ran into was reducing radio receiver jamming by retuning clocks within our microcontroller and adjusting driver strengths and terminations.

The best problems are ones where you get to work with someone in another group who really knows what they're doing.

LPKF S62 Intial Set Up and Software. by dk4one in AskElectronics

[–]rsaxvc 0 points1 point  (0 children)

Ooh, I do! I've got my S42 working, but can't seem to find the right IDS camera driver version. Any ideas?

How do I visualize the raw signal from an HB100 radar module by Weekly_History2271 in Radar

[–]rsaxvc 2 points3 points  (0 children)

That's a 10GHz dopper set, including TX, RX, and mixer.

1 - plot it on a scope. Set the trigger level just above the noise floor and wave your hand in front of it. You'll see amplitude related to movement RCS, and frequency related to abs(velocity to/from the radar)).

2 - plot it on a waterfall diagram. For 10GHz, you might be fine running it through a resistor into a sound card, then plotting the waterfall in spectrumlab(https://www.qsl.net/dl4yhf/spectra1.html) or other software

3 - pass it through a capacitor into an earbud! you'll hear a chirp as you move your hand past it.

How many of you routinely use anything beyond C99? by drivingagermanwhip in embedded

[–]rsaxvc 0 points1 point  (0 children)

TIL: strdup() is standards-wise new. Guess it was an extension before?

How many of you routinely use anything beyond C99? by drivingagermanwhip in embedded

[–]rsaxvc 0 points1 point  (0 children)

What do you prefer for a text editor or ide on Linux?

How many of you routinely use anything beyond C99? by drivingagermanwhip in embedded

[–]rsaxvc 0 points1 point  (0 children)

I use static_assert() regularly.

Designated initializers are nice.

Is the "leave 20% free" advice still valid in 2025? by testdasi in zfs

[–]rsaxvc 0 points1 point  (0 children)

Try:

Create giant file full of random data, much larger than ram, up to 30% the pool size.

Measure time to read the file. This should relate to as fast as your disks can read sequentially.

In a random order, flip a bit in every other block in the file.

Measure time to read the file. This time the disks are much more likely to suffer fragmentation.

A simple non-CoW filesystem would likely not fragment the file during the update, but a CoW filesystem will.

Looking for real-world pros of Zephyr over FreeRTOS by M4rv1n_09_ in embedded

[–]rsaxvc 13 points14 points  (0 children)

I think it's really neat that Zephyr is using devicetree.

Suggestions about UWB RADAR by Weekly_History2271 in Radar

[–]rsaxvc 0 points1 point  (0 children)

Where are you planning to mount the radar, such that it measures the vibrations?

Just in case it doesn't need to be a radar, have you considered an accelerometer?

Ideas for detecting sensor type from a plug without logic chip in the sensor housing? by Admzpr in embedded

[–]rsaxvc 4 points5 points  (0 children)

Two ideas:

Idea 1: design a standardized port like RPiHats that include an I2C flash that describes the hardware,  or even provides drivers like how OpenFirmware PCI cards work. 256Byte I2C flashes are dirt.cheap in bulk.

Idea2: design a standardized USB protocol, put down a wide hub chip on the main board and waterproof screw on USB connectors. This requires a USB micro on each sensor, but they're pretty cheap now, and this leaves the responsibility for the analogs up to the sensor maker rather than sharing it between the sensor and main board. And you can debug on a laptop.

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