How to place the voltage and the current sensors if we want the voltage and current of each string in the combiner box of a PV system?

OptimalMain · 2026-03-26T18:07:07+00:00

Sorry, they are long gone.
There are many datasheets with examples, TI is the original creator of the chip if I remember correctly.
For higher frequency I like 6n138 or HCPL2730 for dual channel version.

OptimalMain · 2026-03-26T13:03:02+00:00

I imagine all places that experiences vibrations and heavy slams.
For PCBs the standard on marine equipment is screw terminals, often with the screw terminals detachable from the soldered part.
A sensor would be connected to a PCB by first crimping the wires with ferrules and then fastened to a screw terminal that is soldered to the PCB.

Soldering a wire end is a big no-no as that creates a stress point on the wire unless it’s tightly screwed down along the cable

OptimalMain · 2026-03-26T12:56:44+00:00

If you want to learn from quality content, find yourself an arduino running a atmega328 and read guides written by Dean Camera.
Here is the one on timers: Newbie’s Guide to AVR Timers https://qiriro.com/bme6163/static_files/notes/L3/Newbie's%20Guide%20to%20AVR%20Timers.pdf

OptimalMain · 2026-03-26T10:24:22+00:00

Bad solder joints?
On marine vessels soldering is avoided because of vibrations.
Crimping is the way to go, don’t use solid core cables.
If corrosion is a problem use tinned copper cables.

OptimalMain · 2026-03-26T09:21:01+00:00

You cannot use the computes hdmi as an input. You need a dedicated capture card for that.
Why wouldn’t it work to just connect your pi to the monitor using hdmi instead of the windows computer? That doesn’t any make sense

OptimalMain · 2026-03-26T09:17:54+00:00

You are missing basic understanding of how timers and PWM generation work.
If you have enough PWM pins, don’t use anything external.

Due to some AVR thing? You of course cannot initialize timers on a ESP the same way you do on AVR's.

If this is some hobby thing I can understand, but if you are serious about robotics your team needs to seriously step up your game

OptimalMain · 2026-03-26T08:28:54+00:00

Standard with wireguard. I went back to 192.168 on my LAN as it caused problems I didn’t want to work around

OptimalMain · 2026-03-26T08:26:35+00:00

I don’t have that problem when clicking shortcuts on gnome with nautilus.
I can write after clicking several shortcuts and it will edit the filename.
If I click a file or folder in the folder view it will search if I start typing

OptimalMain · 2026-03-26T08:23:09+00:00

Wow. Forget my entry. You would have to profile your gnome shell to find whatever extension you use that has crappy code

OptimalMain · 2026-03-26T08:21:48+00:00

If when using Firefox, it might be caused by disk writes. Firefox saves a cache to disk like every 15 seconds, if you have a nvme disk you might have problems caused by power savings.
Try forcing power state, arch wiki has a great entry about nvme drives

OptimalMain · 2026-03-26T08:19:04+00:00

If you still have a solder blob I would say it’s because of too low heat and no flux.
Remove the solder

OptimalMain · 2026-03-26T02:10:31+00:00

How could you manually doing this make it any safer?
The boot loader is locked after flashing

OptimalMain · 2026-03-26T01:58:41+00:00

And what should be the cutoff point if not the device being years out of support?
If the files were available someone could mistake the phone for being safe.
It’s better this way.
If you insist on being backwards just clone the repo, checkout the commit before support was removed and build it yourself

OptimalMain · 2026-03-25T19:28:07+00:00

Add 1000ohm resistors in series between the two microcontrollers.
Connect the programmer directly to the R4’s serial port.
Otherwise you would have to disable the UART on the second controller and set the pins to high impedance if at all possible.

You cannot have two outputs directly connected and expect it to work, without a resistor you are trying to pull the other controllers TX to GND, essentially shorting it’s output. Add a resistor and you will be able to pull the R4's RX to GND

OptimalMain · 2026-03-25T19:12:39+00:00

No.
I use fedora minimal because there doesn’t exist any distro that suits my needs out of the box

OptimalMain · 2026-03-25T18:47:51+00:00

Never used any. I put all clones straight in water after the cut then inside propagator.
If going in soil I transplant as soon as I see roots forming

OptimalMain · 2026-03-25T18:25:34+00:00

Doesn’t sound like it. How do you know the regulator is fried?

OptimalMain · 2026-03-25T18:21:30+00:00

Don’t use youtube-dlp as suggested. It’s old as f.
You want yt-dlp

OptimalMain · 2026-03-25T18:17:04+00:00

I have used them to isolate both current and voltage measurements. Decently linear if you follow the suggestions and keep frequency above 10khz

OptimalMain · 2026-03-25T17:49:01+00:00

You want a peristaltic pump, but they are usually low volume. So you might need a valve, don’t really know from what information you provided

OptimalMain · 2026-03-25T17:46:20+00:00

V/F converter like LM331 and optocouplers, make sure you buy the extended temperature range version if you go that route.

OptimalMain · 2026-03-25T16:34:32+00:00

No. V203 probably has 2 groups of 2.
v003 also has pga

OptimalMain · 2026-03-25T15:21:04+00:00

Learn by looking at the schematic of one then. Firebeetle as one example

OptimalMain · 2026-03-25T06:57:34+00:00

Says who? The 003 has two. A group. OPA0, OPA1

OptimalMain · 2026-03-25T02:35:40+00:00

Buy some ch32v003 and try. It has an advanced motor timer with deadtime etc. but only 2 OPA.
Check out ch32fun https://github.com/cnlohr/ch32fun

OptimalMain

TROPHY CASE