Guru
Joined: 11/12/2012
Location: United KingdomPosts: 12010
| Posted: 10:20am 13 Jun 2026 |
Here is an update to the HDMIUSB board
SCH_Schematic1_2026-06-13.pdf
This is configured using OPTION RESET PICO COMPUTER 3 with the 6.03.00 firmware (RC18 onwards. This configuration applies to every RP2350 build. In the case of VGA builds you can use a little PCB adapter to connect to the I/O port.
In the case of the WEB and bluetooth builds it uses the official Raspberry Pi RM2 (RMC20452T) wireless module which effectively makes the board a super RP2350B Pico2-W
I've been using a first prototype to test the new HDMIWEB build and all looks good. Note that I've simplified the DVDD supply by using a fixed 1.3V regulator which works perfectly up-to 396MHz and the board now includes a 4 Pin JST-SH Cable (Qwiic, STEMMA QT, Qw/ST) connector to allow modules to be chained off it if required. I've also replaced the p-channel mosfet which switched the USB host 5V rails with a proper higher power but current limiting switch.
As before the board provides I2S audio has a DS3231 RTC and all the usual goodies. I'm waiting on a second prototype that has a trivial pin usage change and assuming all good will then release the gerbers. Cost for a board fully populated other then the RM2 module (JLC/LCSC don't yet stock it, but they did do the PCB layout for me) is about USD45 each in 5-off quantity
Edited 2026-06-13 21:40 by matherp