Guru
Joined: 05/10/2019
Location: United KingdomPosts: 9179
| Posted: 07:28pm 18 Feb 2024 |
By default the incoming 5V supply feeds the Pico via a regulator onto the 3V3 rail and the switcher is disabled. I'm not sure if this is how Leo has built it? You can take the GND off 3V3EN and leave the regulator out.
The barrel jack socket powers VSYS via a diode.
There is no connection to VBUS, but it could simply be linked to VSYS to get 5V out of the USB.
Isolating GP8 and GP9 might be a little awkward but you might be ok to just dab wires onto them for a USB-TTL converter. If that fails then the mosfets might have to be taken out or the traces to their source leads cut underneath the board.
PS2 keyboards are still easy to find, luckily. :)
Edited 2024-02-19 05:29 by Mixtel90