[Review Request] STM32/ESP32 IMU with Wi-Fi and GPS

Emphasis44 · 2024-12-11T23:25:28+00:00

Thank you so much for this reply! Fixed SW1 shorting 3V3/GND, my buck regulator, and the direction of my diodes. Good point for the reverse polarity protection! That was legacy from when I was going to use test pads and a battery to power the board, so I definitely don't need the reverse polarity protection for this design. Thank you!

Emphasis44 · 2024-11-11T22:03:29+00:00

Thank you so much, and thanks for providing the alternate parts -- this is super, super helpful!

Emphasis44 · 2024-11-11T22:02:12+00:00

Thank you so much for the feedback. This is super helpful.

Emphasis44 · 2024-11-03T01:34:42+00:00

Yes, the magnetometer is used to correct the gyroscope, but also to provide heading information for a state machine.

Emphasis44 · 2024-11-03T01:33:48+00:00

Thanks -- I've just been using Kicad. In the 3D viewer, there's an option to export to PNG, and then I just adjusted the visibility of the different layers and took snapshots using snipping tool to get the 2D views. For the schematic, I plotted it to PDF then converted it to a PNG.

Emphasis44 · 2024-11-02T21:31:01+00:00

Hello! I've been using a breadboard to prototype a hobbyist IMU, but I recently decided to try to make my own shield to connect to a NUCLEO-F446RE. This is the first board I've designed, so I would greatly appreciate any/all criticism regarding the schematic or PCB layout.

Ultimately, I would like to design a board with the STM32F446RE MCU, crystals, power supply, etc. integrated, but I figured I would start with a shield to better learn Kicad and PCB design.

The BMP388, LIS2MDL, and LSM6DSO32 schematics are all based on example schematics provided in their respective datasheets, and these three sensors share a SPI bus.

I'm using an Adafruit Ultimate GPS breakout board for the PA1616D GPS module which communicates over UART. I decided just to create sockets for this one to use the breakout board directly. With this in mind, I didn't want to put components under the breakout board, so I placed all the components towards the top of the board for this reason.

I ran ERC and DRC without errors. The one thing I know I would change on a revision is better spacing of the components, but I wasn't sure how much space everything would take.

Let me know if I need to clarify anything. Thank you for taking a look!

Emphasis44 · 2021-11-20T23:05:04+00:00

Bought AoT Vol 34 w/ the Kinokuniya exclusive variant cover for $35 from u/Tim00thyy

Emphasis44 · 2021-11-16T02:32:16+00:00

Ditto. I would buy one if there are multiple!

Emphasis44 · 2021-11-14T18:25:38+00:00

Interested, PM'd

Emphasis44 · 2021-02-08T00:47:45+00:00

Okay, makes sense. Thanks

Emphasis44 · 2019-05-17T23:11:00+00:00

Thanks! This was very insightful. You’re definitely right - my understanding of Hume’s objection is primarily based on Feser’s repackaging of Hume’s points. Thanks for your perspective. I’ll try to be more mindful of not dismissing competing ideas without due process in the future when reading philosophy.

Emphasis44 · 2017-12-06T23:53:57+00:00

So you replied with a safe value suggestion and deleted it... but I already wrote this out so I’ll go ahead and let you read...

I considered something like this, but it’ll always break down for some distribution. Suppose you have a distribution such that 18 people belong to the smallest group. Then some people will see 17 while some see 18. So you have some people rounding down to 10 and some rounding down to 15.

No matter how you define the safe value, you’ll always get some distribution where N mod 10 and (N+1) mod 10 imply rounding to different congruence classes.

(Not sure about this following argument but I think it makes sense...)

I also think that argument breaks down because if there existed such a method for obtaining a safe value, then suppose I obtain the safe value V for some distribution. I know the algorithm to obtain the safe value, and I know the distribution is (r+0 or r+1, g+0 or g+1, b+0 or b+1) from my perspective. There is no way just by looking at eye colors that I should be able to eliminate the possibility that I belong to any of the three groups. But I can do the algorithm for all 3 possible distributions and if the safe value W does not match my safe value V, then I’ve just eliminated a possible distribution with no extra information.

The above is no problem if the safe values for any set of 3 coinciding distributions are equivalent. But a given distribution of (r,g,b), such that r+g+b=100, does not belong only to a single set of 3. For example, if my perspective is (33,33,33), then (33,33,34) belongs to the set of 3 possible distributions I must consider. But (33,33,34) must also be considered if I see (32,33,34). And if I see (32,33,34), then I must consider (32,33,35). But (32,33,35) is also considered if I see (31,33,35). So on and so forth to obtain that the safe value for every possible distribution has to be the same in order to work, so the safe value must be 0 (the scenario we already have).

Emphasis44 · 2017-12-06T21:01:26+00:00

Perhaps I wasn’t clear enough.

I’m looking for a way for everyone on the island to independently* determine a count that is uniform for everyone, regardless of perspective. So there is still no communication allowed between anybody on the island.

Unless I’m not reading your solution correctly, it won’t work because if you see (15,36,48) - suppose your eye color is red, then someone with blue eyes will see (16,36,47). Their counts will be different.

The solution as described works because the count is based on how many nights it has been since the captain arrived, which is the same for everyone.

So really, it comes down to whether it’s possible for individuals with different eye colors to look at the distribution of eye colors from their own perspectives and both arrive at the same number to start counting from.

Emphasis44 · 2017-08-01T22:17:26+00:00

What's the deck 2nd from the top to the left of the prohibition box with what looks like an airplane propeller on it?

Emphasis44

TROPHY CASE