Connecting the EXT3 to the Adafruit Feather

Scope

This configuration has been tested successfully against
  • Feather M0 for the screens up to 3.7" included thanks to the 32KB RAM
  • Feather M4 for the screens up to 9.7" included thanks to the 192KB RAM
  • Feather nRF52832 for the screens up to 7.41" thanks to the 64KB RAM
  • Feather nRF52840 for all the screens thanks to the 256KB RAM
  • Feather RP2040 for all the screens thanks to the 256KB RAM

For a safe connection of the e-paper displays, please refer to EPD Handling and ESD Precaution.

Software

On the main sketch, set the board to boardFeatherM0M4, corresponding to the pins defined in the hV_Configuration.h file of the ePaper_EXT3_Basic_Library (link 1, link 2).

Notes

This configuration is valid for other Feather variants, although some pins numbers may change.

Configurations are available for the Feather M4, Feather nRF52832, Feather nRF52840 and Feather RP2040.

On the Feather RP2040, the I²C bus needs to be set to Wire1 to keep the same default SDA and SCL pins.
Sketch.ino

    










	

    

        
hV_Configuration.h

    

    

        

    









					
									

		
	





Hardware





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Large screens 9.7" and 12.2" require panelCSS to be defined and connected.

If the second memory is populated on the EXT3 board, flashCSS needs to be defined and connected. The library will keep flashCSS HIGH to avoid any interferences with the other devices connected to the SPI bus.



					
										
							

		
	






Posted: 28 Feb 2021
Updated: 24 May 2021, 24 Aug 2021, 03 Oct 2022