I'm very pleased with this one - everything works perfectly first time.
There are a couple of tiny changes in the gerbers from my prototype. The top left mounting hole was in the wrong place so that is corrected. Also I've changed the electrolytics to tantalums. The box is the MULTICOMP MCRM2015S.

Notes on use.
Solder the PICO2 direct to the motherboard ensuring it is completely tight to the PCB
On the rear side of the board there are 4 holes without solder mask. Apply liquid flux to these and solder through them. These connect the USB programming micro-USB, Pin GP23, and improve cooling for the USB HUB chip.
Leave all jumpers off the board and insert a micro-USB into the PROG connector
Load up the HDMIUSB firmware (V6.00.00b10 or greater) then remove the microUSB connector
Install jumpers to enable the USB hub circuit (1 to 2 and 3 to 4)
Install jumpers to enable the SDcard (default is GP26, GP27, and GP28)
Install a CR2032 battery
Connect a USB-C cable and an HDMI cable and press the on/off switch
You should then get the Copyright logo on the screen
Type "OPTION RESET HDMIUSB" to fully configure the board and you are good to go.
To update the firmware turn off the power switch, remove jumpers 1 to 2 and 3 to 4
Hold the boot switch down on the Pico2 and insert a microUSB cable in the "PROG" socket. Remove the microUSB, replace the jumpers and power back on.

The onboard USB hub allows you to connect up to 4 USB devices, keyboards mice, gamepads. A green LED adjacent to the USB connector will light up to indicate they are operational.

Enjoy

As always the design files are free to use and cost for 5 motherboards from JLC fully populated is $93.77 add a PICO2 and you have a Boot to Basic computer with HDMI output, Battery backed RTC, Audio output, SDcard and 4 port USB Hub for less than USD30 - can't be bad
I don't build and sell any of my designs so organise groups or ask Grogster nicely if you want one.
To reduce the price from JLC slightly remove the headers and other through hole parts from the BOM/P+P and solder them yourselves







Gerbers

Gerber_PCB1_2024-09-27.zip

Pick and place and BOM


BOM_Board1_PCB1_2024-09-27.zip

Schematic


1ba47582-d700-474d-981c-a37b26dd0135.pdf


EasyEDA design file

PicoUSBMotherboard.zip


Edited 2024-09-27 23:34 by matherp

---

Thanks Peter!
It looks good. I hope someone from the German section will have it made. I'm in hospital for two weeks, starting on Monday.
Kind regards
Michael

Congratulations Peter,

Looks like a good plaform for the new generation.

Harm
Edited 2024-09-28 00:07 by Volhout

You don't have access. There is a diode in the way, in any case the additional cost is trivial.

That's a nice board, Peter. A surfeit of greenness. :)  I see a rogue red LED sneaked in when you weren't looking though. ;)

Just ordered 5 from JLC.  

Total cost with discounts, shipping to USA, taxes etc was $115.18 or $23.04 per board.  

Note that if you order more, it brings the cost per board down.  I considered ordering 10 but seems they currently don't have enough inductors in stock for 10 boards?

When they arrive, I may have 3 available in the US at cost + shipping.

Footnote added 2024-09-28 02:32 by Sasquatch
Forgot to mention that the above cost do NOT include the Pico2 module, those will add an additional $5.00 per board to the total cost.

Pardon my USB ignorance but; don't suppose multiple boards can be connected via USB?
[takes cover]

  Quote  

I considered ordering 10 but seems they currently don't have enough inductors in stock for 10 boards?

There is a good alternative which is in-stock but they don't currently have a footprint for it. I've requested this which normally only takes a few days. Once I have it I'll post a set of variant design files with the new part

  Quote  

Pardon my USB ignorance but; don't suppose multiple boards can be connected via USB?

No. The firmware doesn't support CDC host
Edited 2024-09-28 02:41 by matherp

As usual, a thing of beauty but now I'm agonising over this or the new CMM2.

I gather that the CMM2 still kicks butt with video res, memory and speed...right? Oh and available GPIO.

The CMM2 is twice as fast as a RP2350 overclocked to 378MHz. It has masses more memory for programs and multiple video modes and lots of pages for building images. It can only support a USB keyboard and this can't be connected through a hub (limitation of the STM USB stack).
The editor and the filemanager are far superior and are fully integrated with mouse support (PS2 compatible mouse plugged into the USB A connector)

Possibilities here are freaking endless. Totally stoked  

Looking at CMM2 as a master and the new board as slaves.

Are you kidding me?

Show me a Siemens, AB, BeckHoff product that can come close

wtf is that board? pico 2? you made it?

  stanleyella said  

wtf is that board? pico 2? you made it?

Hey Stan

Wake TF up  

Yeah, still amazsd at rate Pete churns this out.

  PhenixRising said  

  stanleyella said  

wtf is that board? pico 2? you made it?

Hey Stan

Wake TF up  

Yeah, still amazsd at rate Pete churns this out.

always the latest ,, it's too dynamic
sorry to annoy but the olimex pico 2 does it all for lowest price
anyway gone back to usb vga pico 2 for a change and same rocks13 in mode 1 is no flicker unlike hdmi which mode 1 flickers same program

Carl , I would be interested in one of your boards when they come in. I live in Illinois. Just let me know how much and when.
Jack

Ok Jack, I have you down as first in line for one of the extra boards.  There is a 3 day holiday in China next week, so my best guess is the boards should be here in about 2 weeks or so.  I'll PM you on TBS when they are ready.

Hello EU user , if enough ppl chime in here I will ordering and send it out . Same procedure as last ‚year‘ James 🥳

Plasma,

Sign me up for one.

Volhout

Harm: have you seen my PM to you?

  Quote  

sorry to annoy but the olimex pico 2 does it all for lowest price

Yes partly but lacks:
Serial console adapter (CH340 or equivalent)
4-port USB hub
Battery backed RTC
Compatible case
On/Off switch
Volhout's improved audio filter
USB-C power/console port

In addition the HDMI wiring is less direct/equal length decreasing image stability
Edited 2024-09-28 19:02 by matherp

  Plasmamac said  

Hello EU user , if enough ppl chime in here I will ordering and send it out . Same procedure as last ‚year‘ James 🥳

Hi Plasma,

Sign me up for one too.  

Still waiting for an account I can pay into...please!
But I don't want to be pushy.
I'd really like to pay up front, with the option to pay more if needed.

Kind regards
Michael

PS:
Maybe we (Plasma) should move this thread? It might disrupt the topic
Edited 2024-09-28 20:54 by twofingers