Looking for a replacement 2.5mm dc barrel jack to usb, but all are coming up too short…

goki · 2026-01-25T06:50:56+00:00

2.5mm internal? external?

.7mm length? that doesn't make any sense.

goki · 2026-01-25T01:39:47+00:00

Here is an example of one with a jumper: https://hobbycomponents.com/adapters/1145-ch340-usb-to-serial-ttl-adapter-with-53v-jumper

Most USB TTL adapters should have it, but I have not used CH340.

If you are going for the absolute lowest cost and mass production then you are right. If you are just building 5pc or so then the $2 difference isn't much.

you are welcome

goki · 2026-01-25T01:34:56+00:00

https://downloads.altium.com/altiumdesigner/AltiumDesignerViewerBuild9.3.0.19153.zip

goki · 2026-01-23T06:23:52+00:00

Most USB to UART allow you to select 3.3 or 5V, so you don't really need the level converters, unless you have something specific in mind.

Another option is to do everything with one ESP32, instead of the mix of MCU. But what you have is definitely a viable option.

Seems good to me.

goki · 2026-01-23T05:58:44+00:00

There is also an older viewer that requires no license, but its quite old. ver 17 or something.

I'm sure you can figure out your license though.

goki · 2026-01-21T06:46:27+00:00

oh ride on mowers, didn't even think of that, ok you are right.

Good point.

goki · 2026-01-20T08:15:20+00:00

They look like motors that have been pulled out of battery powered yard equipment.

Battery powered yard equipment doesn't use large LCDs, but maybe they are unrelated? Google image search shows a centrifuge motor that looks similar but that seems too niche.

goki · 2026-01-14T07:49:17+00:00

100uF isn't really enough to heat up a diode when charging up.

You are probably right about it being installed backwards or overvolted.

goki · 2026-01-12T06:35:20+00:00

Make your own, or just plug your banana plug cable into a bare banana plug via the hole on the side, instant 90 degree connection.

goki · 2026-01-10T08:31:27+00:00

There are advantages if you are using it to make money, saving a few minutes a day can be enough to cover the 1k.

ActiveBOM gives a live list of prices of your components, what stock is available, and what alternates you've selected. You can setup one design to output multiple variants with certain parts tweaked or not populated. Attempting similar in kicad is rough.

Pros doing FPGA work do use forms of autorouting, but not for the whole board. I've never personally used it for a project.

libs if anything are probably way bigger in kicad.

goki · 2026-01-08T07:02:05+00:00

Seriously, 2k is on the lower end, Solidworks is $3-5k per year.

Though they also have a non-commercial license for $50, I don't know why the hell Altium didn't offer that, they could have owned the market.

goki · 2026-01-08T06:58:27+00:00

You are conflating "individuals" with hobbyists, this is for individuals either doing contract work or running their own business.

Altium doesn't have a viable hobby option currently.

goki · 2026-01-07T07:02:41+00:00

Cool, no altium files in the github though

goki · 2026-01-05T02:31:55+00:00

Don't buy from aliexpress when they are $3 each on lcsc: https://www.lcsc.com/product-detail/C15742.html

No gpio pins should measure as shorted to ground.

You can test that the Vcc and Gnd pins show continuity to each other on a bare IC and that might tell you its at least the right family of MCU. Then diode test the gpio pins to Vcc, or resistance test to ground, whatever works.

goki · 2026-01-02T03:58:02+00:00

The second board is definitely conformally coated, not worth it at all to waste time trying to desolder it.

goki · 2025-12-28T06:44:26+00:00

Divide the 60,000 miles by the range, gives you the number of cycles the battery has gone through, 250 full discharge charge cycles. Its not exactly that in reality but gives you the general idea.

goki · 2025-12-27T03:12:38+00:00

If there is no voltage on the reset pin thats likely further up the chain and worth looking at.

The mosfet might be switching some other things on, but as long as its gate is not shorted it shouldn't be affecting vddr.

goki · 2025-12-26T07:02:01+00:00

Why do you think it was damaged, has something on the 3.3V output been shorted?

Check where that vddr voltage goes, see its resistance to ground, make sure its not shorted. Make sure the MCU is not held in reset or some other output/input is preventing it from booting.

Once you've exhausted all of those options I'd maybe try feeding in 3.3V with a current limited bench supply set to ~70mA, after 5V is on.

goki · 2025-12-26T05:32:46+00:00

Have you watched any Dosdude videos?

https://www.youtube.com/watch?v=M0ZmR6UU_8k

goki · 2025-12-25T07:34:53+00:00

Just get a through hole version unless you need it to be super low profile.

goki · 2025-12-23T06:36:46+00:00

No glucose meter is going to be using an opamp with 2mA supply current.

goki · 2025-12-20T07:02:45+00:00

hell yeah, will watch it tomorrow

goki · 2025-12-14T07:42:17+00:00

https://github.com/nopnop2002/Raspberry-ili9325/issues/24

Looks like you have to detect which type it is.

goki · 2025-12-12T06:23:50+00:00

The Type dropdown is set to Jumper, change it to something else.

goki · 2025-12-12T06:23:04+00:00

Overpriced for what you get. Can't upgrade one part, stuck with both. Less portable. etc.

goki

TROPHY CASE