Hardware-set-ups

(1) Rpi RP2040 DEV-18288 set up 2022 Q2:

On Rpi Sparkfun board, DEV-18288 have an LED connected from GPIO p0_7, through 22kOhm resistor to plus rail pin left of the USB-C connector.

   +---------+
   |        9|     ^^
   |        8|    //
   |        7|---|>|---/\/\/---+
   |        6|          22k    |   
   |        5|                 |
   |        4|                 |
   |        3|                 |
   |        2|                 |
   |3V3   GND|                 |
   |RST   GND|                 |
   |GDN    RX|                 |
+--|+      TX|                 |
|  +---------+                 |
|                              |
+------------------------------+