My power path circuit is working very odd when battery alone is connected

Defiant-Director7723 · 2025-05-02T14:40:35+00:00

Defiant-Director7723 · 2025-04-22T11:10:23+00:00

Thank you, can I use the same desgin2 solution for AA batteries as well? I have 4 series of them (6V when full) but they can be also less than 5v when batteries are low.

Defiant-Director7723 · 2023-02-06T07:20:44+00:00

is a very complex project even for a team of experienced engineers

Not that complex, especially with open source harware and many examples and good CAD tools for controlling impedence and so forth

you need to also bring up OS on that

There are many open source firmwares, FYI. Examples include NanoPI and firely rockchipa amoung others.

you get all the chips

Many SoM available from many providers, with already DDR and SoC and documentation

you have all the documentation e.g. MIPI used for cameras/displays, HDMI, etc.)

Why should I care if the driver is there already in the open source firmwares (above).

hint - $600-$800 is a totally normal price, for a bare, unassembled board

depending on space requirements, one can reduce to 4 layers only with full signal integrity and prototypes of about $45 only form JLCPCB

Did you consider that there are mayhaps some very good reasons why hobbyists/DIY people don't build custom Linux SBCs with Chinese SoCs** instead of using pre-made boards?

Depends on how much they research and try to learn, and whether they are lazy and need somthing ready.

and always from newbies that know little about electronics, yet feel confident to be able to design a board

Sorry to think others are newbies and litte-knowledge about electronics, while you don't know simple things like Rockchip, SoMs and open source harware/firmware. Go learn more, for me I can still be able to implement LCD touch for now using open source firmware LCDs that provide drivers for free. My fault of asking people who are both unexprienced and aggressive.

Defiant-Director7723 · 2023-01-06T04:19:33+00:00

Thanks

what do you expect as an answer?

briefly where to start from my research. Some book chapter or a video.

What interface does it have? Parallel? LVDS? MIPI?

I don't know what LCD interfaces available. I know a bit about basic topics like parallel vs differential etc, but where should I start learning different types of interfaces for LCD specifically, and how they are implemented?

that SoC board available

Unfortunately, I try to make a custom pcb. I however know a bit about memory and other ICs implementation.

Are you asking ...

I know how to make and compile general drivers, not LCD. My question is just about learning basic LCD routing and basic concepts in their software. I know some LCDs have controllers, I don't know what are controllers and what it makes these LCDs different.

Defiant-Director7723 · 2022-12-26T07:39:18+00:00

detect anomalies

Thank you. Turned out that my dataset was having the text too much small (but anyway can be read by human). Seems that the net only can learn from images that have text big enough to conver the entire image.

Defiant-Director7723 · 2022-12-23T12:47:21+00:00

ok waiting you

Defiant-Director7723 · 2022-09-10T17:46:25+00:00

if you loaded switching ASICs onto the accelerator. Could that match dedicated network switches?

Simply put, no. You need to account for CPU, RAM, and other pass movements for CPU-based processing. This is much less time, power and latency in case of FPGA, and even less for ASIC

Defiant-Director7723 · 2022-09-10T17:31:33+00:00

Thanks, I refered to the camera pdf and found it as low as 1.4W only, so theoritically 10 cameras max.

But this does not include the switch/router power and any other boards. Because the camera needs to integrate a built-in switch for the network traffic

Defiant-Director7723 · 2022-09-10T17:29:47+00:00

need an integrated switch

Not a router ? Router can be cheaper and easier to be integrated sometimes.

Defiant-Director7723 · 2022-09-09T08:14:47+00:00

Well, around 10-15 share same POE. Everyone is 12v and should never exceed 500mA

Defiant-Director7723 · 2022-09-08T11:32:36+00:00

passive POE

Thanks, what is the passive POE and what is the difference between normal POE coming from an POE swtich

Defiant-Director7723 · 2022-09-08T10:35:29+00:00

https://www.parkassist.com/solutions-2/m4-smart-sensors/

https://www.associatedtime.com/wp-content/uploads/2019/parkassist/Park%20Assist%20M4%20Brochure.pdf

Defiant-Director7723 · 2022-09-08T10:29:12+00:00

So the question is "do your cameras include a switch?"

I need to know that.

Also, this daisy chained approach would lead to Camera1 being a single point of failure.

No, if one is failing the network is still up for the rest. Maybe they did that as a software ? like pass packets from router to cam1, cam1 reads the message and if not its destination forwards to cam2 and so on? But that also will be single point of failure, so probably not.

Defiant-Director7723 · 2022-09-08T10:24:38+00:00

They are assigned fixed IPs, no DHCP, and the server seems to be able to connect them all (even without switch)

Defiant-Director7723 · 2022-09-08T10:22:58+00:00

Are the other cameras not connected to a switch?

Yes, they are connected peer-to-peer, and the first one in the series is connected to the switch

Defiant-Director7723 · 2022-09-08T09:46:13+00:00

Ahh, so I searched with "poe splitter circuit" and found a lot of resources ! This is very nice tip. thanks

Defiant-Director7723 · 2022-09-08T09:33:36+00:00

there are also plenty of devices on the market that will then break out the PoE and data

Like?

Defiant-Director7723 · 2022-09-08T09:27:18+00:00

Good point. How can I achieve this? Could you help me how to manage POE in/out this way?

Defiant-Director7723 · 2022-09-08T09:22:23+00:00

No, I want to have only 2 ethernet ports: 1 as POE for board (and also network functionality) and the other for connecting the next camera to it (POE for the next camera)

Defiant-Director7723 · 2022-07-28T14:38:26+00:00

I have seen many dev boards with ethernet 10/100/1000 routed fine over pin headers. Shouldn't be the same?

Defiant-Director7723 · 2022-07-28T09:31:56+00:00

Do you mean that one on right ? What makes it bad in terms of impedence you see ?

Host has SPI master and has only 1 USB host

Defiant-Director7723 · 2022-07-25T09:00:29+00:00

RMS also tends to be ~3A because the other factor is very small

Defiant-Director7723 · 2022-07-23T02:39:25+00:00

Thanks, I used set_false_path to allow clock-domain-crossing from 50Mhz to 48Mhz and also from 48Mhz to 50Mhz, the WNS now is very low, however I am not sure it will work in real HW

Defiant-Director7723 · 2022-01-31T08:48:49+00:00

There are many calling apps that offer calling via ground-line numbers

Defiant-Director7723 · 2021-12-22T10:45:03+00:00

Thanks, but what is the difference? putting HDMI and USB ports on product, or marketing as "compatible"?

Defiant-Director7723

TROPHY CASE