Keyboard FeatherWing Rev 2

This library enables the Solder Party Keyboard FeatherWing Rev 2 to be used with ESP32 FeatherWings running Toit.
FeatherWings tested and known to work:

• Adafruit HUZZAH32 - ESP32 Feather Board

Wiring

Plug the ESP32 feather into the back of the Featherwing Keyboard.

Library support of hardware features:

Feature, support	Y	N	Notes
2.6” 320x240 16-bit color LCD	Y
Resistive touch screen	Y
QWERTY keyboard	Y
5-way button	Y
4 soft tactile buttons	Y
Neopixel		N	ToDo ... integrate Pixel_Strip
Ambient Light Sensor		N	Toit does not support ESP32 Feather pin 26 as AI
microSD connector		N
Stemma QT/Qwiic connector		N	(Untested)
GPIO solder jumpers		N

Notes

1. This version contains the first working version of a UI framework, drawing very loosely upon Elm-UI, Flutter and HotDraw.
   In /examples, execute jag run ui_demo.toit to see.
   Review ui_view_tft.toit for a fragment of tft.toit recoded using the framework. Sofar, only Text elements are implemented.

2. A simple tank simulation and PID control is available in tank_ioctl.toit and presented as a service, installed with jag container install ioctl tank_ioctl.toit.
   Execute jag run tank_ui.toit and view jag monitor, to see the tank level/setpoint/control output printed.
   The level simulation is updated every 6 seconds, the PID runs every 2.
   The UI notifies every 1 second via a resource notification, printing to the console e.g. lvl: 21.1 sp: 25 out: 78.
   Note, the tank_ui.toit example does not require a FW_Keyboard.