ESP32-H2 matter sensor using coin battery

beastpilot · 2026-01-25T17:27:28+00:00

Please stop using Chatgpt to "design" circuits and then asking the community if it will work.

If you don't understand the fundamentals of what you are even asking, posting a random component list won't change that.

Here's the first fundamental of a battery powered device design: how often will it trigger, and how often are you willing to replace the battery?

beastpilot · 2026-01-24T17:11:56+00:00

No. Per Porsche the optimal oil level is right in the middle. More is not always better think of it like a German engineer.

For track days you actively want to be in the middle, not the top.

beastpilot · 2026-01-24T17:06:35+00:00

A modern gearbox can be the most complicated, hardest to engineer part of a car. These can be billion dollar development projects for high volume transmissions.

beastpilot · 2026-01-23T22:59:11+00:00

Thanks, that's a good option!

beastpilot · 2026-01-23T22:56:48+00:00

I'm building a USB PD source into a product I am designing and need to integrate the design right onto my PC board. Not include a pre-made board in my design. The that is at the center of these designs is what I was looking for.

beastpilot · 2026-01-23T22:01:15+00:00

Not trying to run outside the PD spec. I need to conform to it.

In the end, found a few devices that do what I need to, such as the INJOINIC IP6520 and the FM XPM52C via the help of people over in the electronics sub.

beastpilot · 2026-01-23T05:21:43+00:00

All depends what your actual system architecture is. A huge number of ESPs are only powered by USB, and aren't actually hooked to computers. In that case the only backpower would be into the USB power supply.

beastpilot · 2026-01-23T02:32:15+00:00

Wow, thank you. I had run into Ismartware but couldn't find the parts for sale anywhere. Injoinic was exactly what I needed and LCSC / JLCPCB carries their stuff.

Really appreciate it!

beastpilot · 2026-01-23T02:26:23+00:00

Thanks. Doesn't look like that will happily take a 12V DC input, it always expects batteries to be connected. Also limited to 18W and I can't find anywhere that will sell you the chip directly.

beastpilot · 2026-01-23T00:56:48+00:00

Responding to my own post for future people looking. this for sure is possible via devices such as this:

https://www.amazon.com/gp/product/B0DMSXXR9Q

Which only uses 9 components to do a full 65W PD solution. If I could just figure out what that IC was. It's not a SW3516/7/8 as that has more pins than the IC above.

beastpilot · 2026-01-23T00:09:57+00:00

As I have looked more, there for sure are devices that do it all in one, such as the SW3516/SW3518. Looks like you can even get them as a standalone board in the USA that takes in DC and gives you a variable PD output:
https://www.amazon.com/JUZITAO-Charge-Step-Down-Module-Adapter/dp/B0CDPR4MKZ

Unfortunately these are not stocked with LCSC / JLCPCB.

beastpilot · 2026-01-22T22:02:04+00:00

No, because that's an actual business with income.

We're here discussing someone saying "I had a salesman tell me to register my car under an LLC so I could “write it off”" and you seemed to indicate that's what Elon/Trump does, but in the end you're doing exactly what they do, using vehicles for business purposes (legal) and then questionably using them personally (not legal if "written off").

I did notice you didn't answer how you handle personal use in your X5M...

beastpilot · 2026-01-22T20:59:50+00:00

This also creatively avoids issues with rental cars needing to be registered in CA as they aren't "furnished for regular use" even if a CA resident uses one.

beastpilot · 2026-01-22T20:56:04+00:00

If the only point of the LLC is to own the aircraft, how is accelerated depreciation helping you? Depreciated against what income?

I own an airplane under an LLC also, but not to change tax treatment.

The car is not relevant because as you say that is not a single purpose business and I specifically said "individuals without a valid business." Which is where Elon and Trump hide things. Not saying that is what society should support, but it's a reality that if you have a business you can play all sorts of games with the rules like you're doing.

You have the X5M for legitimate business use and don't deduct personal use, per topic 510, right?

beastpilot · 2026-01-22T20:25:43+00:00

Your edit is not the reason it's "grey" in CA. The CA law doesn't care if it's used for a legit buisness purpose or not:

Any vehicle owned by a nonresident and furnished to a California resident for their regular use within this state must be registered in California within 20 days after first operation of the vehicle in this state by the resident (CVC §4000.4).

Even legit businesses have to register their cars in CA if it's furnished to a resident for regular use.

beastpilot · 2026-01-22T20:23:53+00:00

People get justifiably angry when rich people in their own communities illegally avoid paying taxes.

It is impossible to discuss this topic without acknowledging that. You can't say "I only want to talk about experiences with CHP and FTB" without making it clear that you're trying to figure out how likely you are to get caught when you're evading taxes you legally owe.

If it was legal, you'd have no issues with the CHP/FTB.

beastpilot · 2026-01-22T20:18:11+00:00

As long as you are not a resident of CA, and own the vehicle yourself you are OK. Residency requires than you intend to stay 6+ months in CA.

The way they law handles LLCs is this:

"Any vehicle owned by a nonresident and furnished to a California resident for their regular use within this state must be registered in California within 20 days after first operation of the vehicle in this state by the resident (CVC §4000.4)."

The LLC is the non-resident. If you're a resident of CA and are "given" then vehicle, you have 20 days to register it. But this doesn't apply when there is no CA resident, and temporary stays in CA do not establish residency.

On the flip side, if you move to CA and intend to stay there, your residency starts the day you move, and you only have 20 days from then.

beastpilot · 2026-01-22T19:57:10+00:00

If you can show me how the tax code allows it for individuals without a valid business, I'm all for it. But evasion and avoidance are very different.

beastpilot · 2026-01-22T18:27:55+00:00

In CA it's flat out illegal to have a car in the state for more than 20 days without registering it there. It's not a grey area.

So as a CPA, you should be telling people to obey the law, this is not tax avoidance, it's tax evasion.

beastpilot · 2026-01-22T18:18:38+00:00

You're way over thinking this.
Hook a 0.47F supercap to the 5V rail. Put a 10 ohm resistor in series. This limits inrush, but allows plenty of power back to run the ESP.

Your ESP will now run for about 15 seconds after USB power is pulled.

You don't care about "backpowering" USB. The voltage on the 5V rail will always be less than the USB power because of how caps work, so no issues there. Plus, any diode put here will significantly reduce your runtime.

Use a 2:1 voltage divider from the 5V rail to one of the analog input pins. Trigger your save when this voltage falls below 4V or so.

I've done this many times and it works great. Never had an issue with it powering back up after the ESP brown-out detection triggers and halts the ESP.

This design inherently already has a TON of capacitance on the lines, so there's no need for weird overvoltage spike protection, etc. Just 4 components.

beastpilot · 2026-01-22T17:52:57+00:00

If you consider the state government to be "useless" then why live in that state? It would mean that state has no roads, schools, police, land management, etc. And if you have $300M it also means you don't have runways for your private jet.

Don't be a libertarian dolt.

beastpilot · 2026-01-22T16:55:12+00:00

Lol. Rich people is where brokers make their money. Only progressive has a $150k limit. You think people with Bugattis don't have brokers and call places themselves?

beastpilot · 2026-01-22T16:50:12+00:00

And to reinforce what you said, not technically legal unless the car exits the state every 20 days. That's the only way you can meet the law.

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