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Forum Index : Microcontroller and PC projects : PicoMite usb problem

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Friday
Newbie

Joined: 25/08/2025
Location: United States
Posts: 7
Posted: 08:20pm 16 Sep 2025
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So I am stuck,

I flashed PicoMiteHDMIUSB (both 6.03 and 6.01) to a pi pico 2w.  The hdmi works perfect.  But the keyboard does not, I have tried 2 different known working usb otg connectors and 2 different keyboards.  Also tried reflashing several times.

Its my understanding the keyboard should just work once plugged in.  

Any ideas what to try next?

Thanks in advance.
 
Pluto
Guru

Joined: 09/06/2017
Location: Finland
Posts: 376
Posted: 08:44pm 16 Sep 2025
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I think you have to introduce your keyboard by using OPTION KEYBOARD. See manual page 92 for details. (PicoMite User Manual, Revision 3, 8 September 2025)

Pluto
 
Friday
Newbie

Joined: 25/08/2025
Location: United States
Posts: 7
Posted: 08:48pm 16 Sep 2025
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I will wire up a serial cable and try to do that, I was confused by the language on page 36

USB Keyboard
When a USB keyboard is connected it will be immediately recognised (no configuration required) and
MMBasic will allocate it to channel 1 by default– there is nothing extra required.

AND

Configuring the Keyboard
By default the keyboard configuration will be assumed to be the standard US layout. However the OPTION
KEYBOARD command can be used to configure layouts for other countries.
The syntax of the command is:
OPTION KEYBOARD language

But I will make a cable and see if I get can get the serial console working.

Thanks.
 
disco4now

Guru

Joined: 18/12/2014
Location: Australia
Posts: 1025
Posted: 10:24pm 16 Sep 2025
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PicoMiteHDMIUSB would be the wrong firmware. This expects a USB HUB to be present on the board.

PicoMiteHDMI firmware with a PS2 keyboard should work.

Footnote added 2025-09-17 14:49 by disco4now
Sorry, this info is incorrect. PicoMiteHDMIUSB can support USB Keybopard and USB Hub is not required for one device.

Page 33 on manual

Note that a hub is not required. If you only want to connect one device (for example a keyboard) you can just
plug the device (using an adapter cable) directly into the Pico’s USB connector.

F4 H7FotSF4xGT
 
Friday
Newbie

Joined: 25/08/2025
Location: United States
Posts: 7
Posted: 10:52pm 16 Sep 2025
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So, the docs are just wrong?

Note that a hub is not required. If you only want to connect one device (for example a keyboard) you can just
plug the device (using an adapter cable) directly into the Pico’s USB connector.

Page 33...
 
phil99

Guru

Joined: 11/02/2018
Location: Australia
Posts: 2714
Posted: 11:12pm 16 Sep 2025
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Also I think for the HDMI/USB version the monitor and USB keyboard are the default console.

Originally the keyboard had to be a "plain vanilla" one. Any extra features would prevent it working. Not sure if this is still the case.

With nothing showing on the HDMI screen, hopefully the serial console is automatically enabled. Otherwise configuring it by blind typing will be needed.
 
Friday
Newbie

Joined: 25/08/2025
Location: United States
Posts: 7
Posted: 12:38am 17 Sep 2025
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The hdmi screen is showing fine, but the keyboard doesnt do anything, caps lock doesnt even light up when hit.

I thought it might be power, running things off a 3.7 volt battery, so I tested giving it 5 volts solid, and same issue.
 
phil99

Guru

Joined: 11/02/2018
Location: Australia
Posts: 2714
Posted: 02:00am 17 Sep 2025
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  Quote  caps lock doesnt even light up when hit.
That suggests you may not have power going to the keyboard. Applying 5V to VBUS (pin 40) should fix that.

There is a diode between VBUS and VSYS so applying power to VSYS does not power the USB socket.
The keyboard is may not work below 4.5V.
Edited 2025-09-17 12:06 by phil99
 
Friday
Newbie

Joined: 25/08/2025
Location: United States
Posts: 7
Posted: 02:05am 17 Sep 2025
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Yep, solved it just as you posted.

I was powering the pico via vsys not vbus, using vbus even at 3.7volts everything works.

Thanks for the quick replies, having someone(s) bouncing ideas helps.

I will leave the thread here, for the next person who has this problem.

Thanks again
 
Volhout
Guru

Joined: 05/03/2018
Location: Netherlands
Posts: 5257
Posted: 05:22am 17 Sep 2025
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Afaik pico2W was never used with HDMI.
Good it works, but it was never designed to do so.

Only the webmite firmware will give you wifi.

Volhout
Edited 2025-09-17 15:25 by Volhout
PicomiteVGA PETSCII ROBOTS
 
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