Vestigial Pico2 with sdmicro and  I2C

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zeitfest
Guru

Joined: 31/07/2019
Location: Australia
Posts: 660
Posted: 03:22am 23 Jun 2025      

This may be a useful config. It is very quick and easy to get up and running.
It is surprisingly reliable + robust if you use solid wire   The SD card
adapter has a bypass capacitor included.  
(Don't know if it will run MMBasic or not.)
The 4pin header allows a off-the-shelf stemmaQT/qwiic cable to be used.





Pico   Wire    SD adapter  

GP4    GREEN   D6 MISO
GP5    YELLOW  D8 SS
GP6    BLUE    D5 CLK
GP7    WHITE   D7 MOSI
GND    BLACK   GND
3v3    RED     3v3

                     I2C

GP12   (blue)         SDA
GP13   (yellow)       SCL
GND    (black)        GND
3v3    (red)          3v3
(note - do not connect GP14 to the 4pin plug)

Edited 2025-06-23 13:24 by zeitfest
stanleyella

Guru

Joined: 25/06/2022
Location: United Kingdom
Posts: 2766
Posted: 04:00pm 23 Jun 2025      

  zeitfest said  This may be a useful config. It is very quick and easy to get up and running.
It is surprisingly reliable + robust if you use solid wire   The SD card
adapter has a bypass capacitor included.  
(Don't know if it will run MMBasic or not.)
The 4pin header allows a off-the-shelf stemmaQT/qwiic cable to be used.





Pico   Wire    SD adapter  

GP4    GREEN   D6 MISO
GP5    YELLOW  D8 SS
GP6    BLUE    D5 CLK
GP7    WHITE   D7 MOSI
GND    BLACK   GND
3v3    RED     3v3

                     I2C

GP12   (blue)         SDA
GP13   (yellow)       SCL
GND    (black)        GND
3v3    (red)          3v3
(note - do not connect GP14 to the 4pin plug)



(Don't know if it will run MMBasic or not.)
what's it running?
zeitfest
Guru

Joined: 31/07/2019
Location: Australia
Posts: 660
Posted: 10:51am 24 Jun 2025      

It runs programs I have written for it, using the USB/serial for user i/o,
but I was mainly thinking that MMBasic for Picomite would also run on it.
I thought MMBasic could be optioned to use the USB/serial i/o and the sdcard and i2c connections (?) as they are pretty routine.

Now I think of it the recent Pico2 computer used a separate usb/serial chip so
I am wondering if it can still use the inbuilt pico2 socket for serial comms.
Edited 2025-06-24 20:52 by zeitfest
zeitfest
Guru

Joined: 31/07/2019
Location: Australia
Posts: 660
Posted: 01:10am 25 Jun 2025      

eg maybe using

OPTION SDCARD CSpin, CLKpin, MOSIpin, MISOpin

as in OPTION SDCARD  GP5, GP6, GP7, GP4

(?)
stanleyella

Guru

Joined: 25/06/2022
Location: United Kingdom
Posts: 2766
Posted: 05:14pm 25 Jun 2025      

I just made a simple usb hdmi board. I changed the options from standard so the usb to ttl uart is one side of pico and sd card other side.
option list
PicoMiteHDMI MMBasic USB RP2350A Edition V6.00.02
OPTION SERIAL CONSOLE COM2,GP20,GP21
OPTION FLASH SIZE 4194304
OPTION COLOURCODE ON
OPTION KEYBOARD UK, 0, 0, 600, 150
OPTION RESOLUTION 640x480 @ 252000KHz
OPTION DISPLAY 30, 53
OPTION SDCARD GP2, GP6, GP7, GP4
>