Merge remote-tracking branch 'origin/develop' into rename-headless-to-display-type

Author: andre-stefanov

Software/Arduino code/OpenAstroTracker/Constants.hpp

@@ -9,17 +9,25 @@
 /**
  * Supported display types. Use one of these values for DISPLAY_TYPE configuration matching your used display.
  * 
- * DISPLAY_TYPE_NONE:           No display. Use this if you don't use any display.
- * DISPLAY_TYPE_LCD_KEYPAD:     1602 LCD Keypad shield which can be mounted directly to an Arduino UNO / Mega boards.
- *                              Example: https://www.digikey.com/en/products/detail/dfrobot/DFR0009/7597118
+ * DISPLAY_TYPE_NONE:                       No display. Use this if you don't use any display.
+ * DISPLAY_TYPE_LCD_KEYPAD:                 1602 LCD Keypad shield which can be mounted directly to an Arduino UNO / Mega boards.
+ *                                          Example: https://www.digikey.com/en/products/detail/dfrobot/DFR0009/7597118
+ * DISPLAY_TYPE_LCD_KEYPAD_I2C_MCP23008:    RGB LCD Keypad shield based on the MCP23008 I/O Expander. It can be mounted 
+ *                                          directly to an Arduino UNO / Mega boards and controlled over I2C.
+ * DISPLAY_TYPE_LCD_KEYPAD_I2C_MCP23017:    RGB LCD Keypad shield based on the MCP23017 I/O Expander. It can be mounted 
+ *                                          directly to an Arduino UNO / Mega boards and controlled over I2C.                                         
  **/
-#define DISPLAY_TYPE_NONE       0
-#define DISPLAY_TYPE_LCD_KEYPAD 1
+#define DISPLAY_TYPE_NONE                       0
+#define DISPLAY_TYPE_LCD_KEYPAD                 1
+#define DISPLAY_TYPE_LCD_KEYPAD_I2C_MCP23008    2
+#define DISPLAY_TYPE_LCD_KEYPAD_I2C_MCP23017    3
+
 
 // Supported stepper models
 #define STEPPER_TYPE_28BYJ48    0
 #define STEPPER_TYPE_NEMA17     1
 
+
 // Supported stepper driver models
 #define DRIVER_TYPE_ULN2003             0
 #define DRIVER_TYPE_GENERIC             1

Software/Arduino code/OpenAstroTracker/platformio.ini

@@ -17,6 +17,7 @@ lib_deps =
 	teemuatlut/TMCStepper @ ^0.7.1
 	waspinator/AccelStepper @ ^1.61
 	arduino-libraries/LiquidCrystal @ ^1.0.7
+	lincomatic/LiquidTWI2@^1.2.7
 
 [env]
 framework = arduino