2014.02.15 All files from raspi15
2022.11.05 Site for Pico Watchdog C example https://raspberrypi.github.io/pico-sdk-doxygen/group__hardware__watchdog.html
2022.12.12 Site for raw ESP8266 wiring & sample PCB https://how2electronics.com/how-to-program-raw-esp8266-12e-f-chip-using-arduino-ide/