Where I can buy the Samsung 35E 18650 3500mAh 8A -Protected Button Top Batteries.

[ziomario]

I will not do it,but,if I will be able to create a working FreeBSD "tablet" with a professional look and feel, can I start selling the product as is or should I ask some kind of electrical certification to ensure that the tablet created are safe ?

 

[Bill_Bright]

can I start selling the product as is or should I ask some kind of electrical certification to ensure that the tablet created are safe ?

I don't know the laws there, or the expectations of the public, but here, if you are selling to another a product you made, it better be safe or you will get the pants sued off you by ambulance chasers/shysters in a heartbeat. So at the very least, you should get liability insurance - if not your own lawyer.

 

[qxp]

So here is another link, this time for bare board and you can connect the batteries yourself - might require spot welder:

Amazon.co.uk

With regard to certification, in EU you definitely need "CE" mark that assures everyone your device does not emit radio interference. There is also a requirement to be lead free. There could be other laws. Note that the rules are likely a bit different for "kits" rather than complete devices. With the kit the customer is expected to assemble it themselves. Do some research and talk to a lawyer.

 

[ziomario]

So here is another link, this time for bare board and you can connect the batteries yourself - might require spot welder:

Amazon.co.uk

With regard to certification, in EU you definitely need "CE" mark that assures everyone your device does not emit radio interference. There is also a requirement to be lead free. There could be other laws. Note that the rules are likely a bit different for "kits" rather than complete devices. With the kit the customer is expected to assemble it themselves. Do some research and talk to a lawyer.

That's a good point. I COULD sell the parts not assembled letting to users the task to connect everything,including the instructions on a small piece of paper. In this case I can't ask them to be able to make solderings.

 

[qxp]

That's a good point. I COULD sell the parts not assembled letting to users the task to connect everything,including the instructions on a small piece of paper. In this case I can't ask them to be able to make solderings.

There are plenty of "kit" products on Amazon where everything is soldered already and you just need to connect or screw pieces together. But I am in USA and really don't know the situation in Europe - read websites, talk to a lawyer. Also, at least in USA the FCC emissions check costs several thousands from the lab - not a big deal if you make enough to pay yourself salary and can do most of the verification yourself, but might be tricky if you are just starting from 0.

The lab uses professional equipment that is expensive, but there are substitutes - all you need is a sensitive spectrum analyzer, some antennas and relatively EMI quiet place to do the test. This way you can be prepared and not pay the EMI lab for several tests.

Antennas can be had cheaply:

Amazon.com

There are also inexpensive spectrum analyzers like TinySA - do your own research to get the best one, as some of the clones might not have the best performance. I don't know what the sensitivity of TinySA type analyzers is, if it is not enough you can get an amplifier like the link below or even a bare board.

Amazon.com

In the USA these parts can be cheaper on eBay, and also you might find more variety. Amazon often ships faster, but this varies as well.

I also suspect one can use RTL-SDR module to do scans of frequency as a spectrum analyzer, but I am not sure how easy it is to calibrate it to find out how much power you really have.

The way you do the test is that you position the probe where you want and do a background scan with device off. If you find any particularly loud peaks you need to deal with it either by finding what other equipment is producing those, or by using a box that shield and/or absorbs outside interference like radio stations. After you have done background scan you save the trace as reference, turn the device on and do another scan. This time around you plot new scan minus reference and look for any excess. If nothing obvious is found, move the probe around until you find excess and then repeat the procedure with background scan, as your background has probably changed.

Since you are using commercially made components you don't have a luxury of redesign if you find EMI problems and you would need to mitigate. Metal enclosure suppresses EMI, but if you don't have that you can augment it with adhesive metal foil (copper preferably). There is also EMI absorbing foam that works at high frequencies. Cable position can have great effect on EMI, especially if there are sharp turns - avoid them. Note that both metal foil and foam will affect cooling.

 

[ziomario]

---> There are plenty of "kit" products on Amazon where everything is soldered already and you just need to connect or screw pieces together...

If you find a kit made of electronic hardware components that promises to boot and run FreeBSD,let me know and share it with me ;D

 

[qxp]

---> There are plenty of "kit" products on Amazon where everything is soldered already and you just need to connect or screw pieces together...

If you find a kit made of electronic hardware components that promises to boot and run FreeBSD,let me know and share it with me ;D

Heh How about Rapsberry pi ?

arm/Raspberry Pi - FreeBSD Wiki

Just add a microSD card with preinstalled OS and there you go Add touchscreen and keyboard if you feel like it.

 

[ziomario]

What's the difference with what I'm doing ? only the soc. But the Rockpro RK399 is better than the Raspberry Pi. If you look further you will find a version of FreeBSD for the Rockpro. I can also swap the Rockpro with the Raspberry Pi if I want. The problem are the drivers. FreeBSD is not a mature multimedia OS,it is tailored to run on servers. I will be lucky if it will be able to turn on the display. For sure it is not able to enable the touch screen without a driver. LInux is full of drivers for everything,but not FreeBSD. And I'm not a developer. I'm not able to write drivers for this os.

 

[qxp]

What's the difference with what I'm doing ? only the soc. But the Rockpro RK399 is better than the Raspberry Pi. If you look further you will find a version of FreeBSD for the Rockpro. I can also swap the Rockpro with the Raspberry Pi if I want. The problem are the drivers. FreeBSD is not a mature multimedia OS,it is tailored to run on servers. I will be lucky if it will be able to turn on the display. For sure it is not able to enable the touch screen without a driver. LInux is full of drivers for everything,but not FreeBSD. And I'm not a developer. I'm not able to write drivers for this os.

Well you asked for a kit that can FreeBSD and I suggested Raspberry Pi, as it has a lot of addons just like you need, including batteries. If you look at the link above, it appears that Raspberry PI2 has all the essential components supported with FreeBSD. The newer Raspberry Pi4 is missing audio and Wifi.

if you want to try x86 rather than arm there is a list of laptops and their compatibility with FreeBSD:

Laptops - FreeBSD Wiki

 

[ziomario]

The Raspberry PI2 has all the essential components supported with FreeBSD.

Essential components.,ok,but it's not enough to have the essential components working to have a full satisfaction when you see that the product where you have invested time and money,works very partially. FreeBSD does not support most of the displays and the touch screen panels due to missing drivers. A lot of multimedia devices lacks of the drivers. I'm not interested to try X86,but give a look at the table,how many features are missing and broken. I'm trying to create some kind of tablet. At the moment I never found a device that looks like a tablet where FreeBSD runs decently. I'm sorry but there aren't kits where everything works enough good to be able to create a mature product neither to sell it in a market place. Everything is in experimental stage. More luck with very old device,but choose a very old device is a big compromise,for me not acceptable.

 

[qxp]

Essential components.,ok,but it's not enough to have the essential components working to have a full satisfaction when you see that the product where you have invested time and money,works very partially. FreeBSD does not support most of the displays and the touch screen panels due to missing drivers. A lot of multimedia devices lacks of the drivers. I'm not interested to try X86,but give a look at the table,how many features are missing and broken. I'm trying to create some kind of tablet. At the moment I never found a device that looks like a tablet where FreeBSD runs decently. I'm sorry but there aren't kits where everything works enough good to be able to create a mature product neither to sell it in a market place. Everything is in experimental stage. More luck with very old device,but choose a very old device is a big compromise,for me not acceptable.

I guess I am missing something - if you are not using XFree86 how are you going to use the display ? Console only ?

Also the table I am looking at lists all Raspberry PI 2 devices as supported, including audio, display, camera, ethernet and USB. It's the newer Rapsberry PI 4 that has audio, camera and WiFI listed as unsupported, probably because the driver for the broadcom chip is not ready yet.

 

[ziomario]

Raspy 2 is old and not powerful. And even on this old board,I have the same problems that I have using the soc that I've chosen,missing drivers for display and touchscreen and for example,for this :

Cheap A7670E USB Dongle LASE support 4G LTE-CAT1 A7670E European band | eBay

Le migliori offerte per Cheap A7670E USB Dongle LASE support 4G LTE-CAT1 A7670E European band sono su eBay ✓ Confronta prezzi e caratteristiche di prodotti nuovi e usati ✓ Molti articoli con consegna gratis!

www.ebay.it

if I want to give to my "tablet" the ability to place and receive phone calls.

I have some hope that the display will work because mine that can be powered via USB. Not sure,anyway that I will not find some bug and even this kind of display will not work.

Well, if you take my challenge of your competency as a personal attack - then my apologies.

Yes, it's basically panasonic NCR18650B with protection board. Good cells. I use those without protection for e-scooter batteries all the time. Max continuous current is 6A, so it should be good even for moderate loads.

From the end-user perspective there is no difference. All that little protection board does, is prevents overcharge and deep discharge(shuts down the output). OCP and OTP never works even if claimed in spec. If you put it in a power bank, the charge controller will take care of overcharge and critical discharge instead, so no need to sweat.

Trigger cables or trigger boards work the following way: you connect it to the power bank, and the IC inside of it tells that "hi, I am a device that supports QC3.0 and I need 12V". Power bank then bumps the output voltage automatically. So, if you buy a pre-made cable with DC barrel jack and fixed voltage trigger, you don't need to do anything.
Also, most small cheap powerbanks only support one QC/PD device at the time, e.g. your second USB port will likely stay at 5V regardless of triggers and may glitch out if you are already pulling max power from the first port (that's why it's better to power the display from ROCKPro64).
And that's the reason why I recomended another powerbank, cause the one in your first post only supports 5V2A output per port. No QuickCharge or PowerDelivery. Or get that enclosure which @qxp mentioned. It's basically the exact thing you need, and it will not require any trigger cables. And it's small.

It's already 3AM where I'm from, so I'll try to draw a quick diagram for you a bit later. I'm off to get some sleep.


.

Please don't forget to draw the diagram for me thanks...

 

[qxp]

Raspy 2 is old and not powerful. And even on this old board,I have the same problems that I have using the soc that I've chosen,missing drivers for display and touchscreen and for example,for this :

Cheap A7670E USB Dongle LASE support 4G LTE-CAT1 A7670E European band | eBay

Le migliori offerte per Cheap A7670E USB Dongle LASE support 4G LTE-CAT1 A7670E European band sono su eBay ✓ Confronta prezzi e caratteristiche di prodotti nuovi e usati ✓ Molti articoli con consegna gratis!

www.ebay.it

if I want to give to my "tablet" the ability to place and receive phone calls.

Oh, I agree that newer Raspberry Pi's are faster, but I was just showing proof that boards exist. Depending on your application RPI2 can be enough for now and then you can replace it RPI 4 when support improves.

Phone calls - interesting ! Looking at this Raspberry Pi hat it looks like A7670E is partially controlled through a serial port - I would have expected that to work. You might have some luck porting Linux drivers from Raspberry Pi - USB ports are really easy to interface with.

A7670E Cat-1 HAT - Waveshare Wiki

www.waveshare.com

I have some hope that the display will work because mine that can be powered via USB. Not sure,anyway that I will not find some bug and even this kind of display will not work.

Powered via USB - is it USB-C or something else ?

 

[ziomario]

You might have some luck porting Linux drivers from Raspberry Pi...

I'm not so experienced and skilled because I'm not a programmer. I can't do this.

Powered via USB - is it USB-C or something else ?

The display that I've bought can be turned on attaching it to the USB-C port of any model of Raspberry. I hope that it supports also the board that I've chosen.

but I was just showing proof that boards exist

I know that it exists. But if it slow and I can't run only light and few applications,why should I use it ? I want to create something that I can use everyday,not only a proof of concept. And anyway,even if I choose it,I will have the same problems that I have now with the board that I've got : missing drivers. So,if the driver missing problem is the same,I can as well use a most powerful soc. Remember that the raspy 2 and a lot of other socs have basic functionalities running,just like the soc that I've chosen,nothing more.

Also the table I am looking at lists all Raspberry PI 2 devices as supported, including audio, display, camera, ethernet and USB

I think that the camera,display,wifi can work attaching to the board an hat. But the soc + the hat makes the tablet very thick. More than a tablet I would build a brick thicker than mine !