Connecting the Pervasive Displays EXT3-Touch

The EXT3-Touch board is an option of EXT3-1 board for the 2.70" and 3.70" panels with touch.

It adds 4 signals to manage the touch controller: I²C clock and data, /Reset and !Interrupt.

Connecting the EXT3-Touch to the screen

The Extension Kit Gen 3 features two series of connectors for two flat cables:
  • Top with 6 ways for the touch controllers,
  • Right-most with 24 ways for the screens.

Gently lift the locks up, insert the flat cables and replace the locks back. Only one screen can be attached at a time.
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On the example shown on the right, a 24-way flat cable is attached and the jumper is positionned for a screen smaller than 4.37".

Connecting the EXT3-Touch to the EXT3-1

Once the screen has been connected to the EXT3-Touch board, connect the later to the EXT3-1 board with the 24-way flat cable.

Align the two boards with the EXT3-1 below EXT3-Touch, so the flat cable goes from one board to the other. Gently lift the locks up, insert the flat cable and replace the locks back. 

​Optionally, mount the EXT3-1 on top of the EXT3-Touch with the provided spacers, bolts and nuts. This configuration saves space.

Connecting the EXT3-1 and EXT3-Touch to the micro-controller

To connect the EXT3-1 to the micro-controller, plug the 10-way cable into the male pins of the EXT3 board with
  • The white cable in front of the white mark of the silk-screen;
  • The black cable in front of the black mark of the silk-screen. It is also marked with a white dot on the connector.

To connect the EXT3-Touch to the micro-controller, plug the 4 cables into the male pins of the EXT3-Touch board.
All the signals are detailed below. Note that that pins 11 and 12 are optional.
Picture
On the micro-controller side, only the top part of the 20-way cable numbered 1 through 10 is going to be connected:
  • White number 10 for GROUND
  • Black number 1 for +3.3V
  • Brown number 2 to SPI clock
  • Green number 6 for SPI MISO
  • Blue number 7 for SPI MOSI
      
Power and logic signals are 3.3V only.

Connecting the EXT3 to 5V may damage the board and the screen. A regulator and logic level converters are required.
The connections for the other cables are specific to each board.

On the sofware side, the hV_Configuration.h file of the ePaper_EXT3_Basic_Library (link 1, link 2) lists those configurations.

To select a given board, just use the board name to the screen constructor, here for boardLaunchPad.

On the hardware side, the following sections provide the configurations for the most popular boards:
  • ​Connecting the EXT3-1 and EXT3-Touch to the LaunchPad MSP432P401R
  • Connecting the EXT3-1 and EXT3-Touch to the LaunchPad and LPSTK CC1352R
  • Connecting the EXT3-1 and EXT3-Touch to the Arduino Zero or M0 Pro
  • Connecting the EXT3-1 and EXT3-Touch to the Raspberry Pi Zero and B
  • Connecting the EXT3-1 and EXT3-Touch to the Particle Photon
  • Connecting the EXT3-1 and EXT3-Touch to the Adafruit Feather M0
  • Connecting the EXT3-1 and EXT3-Touch to the STM32 Nucleo
  • Connecting the EXT3-1 and EXT3-Touch to the Raspberry Pi Pico
  • Connecting the EXT3-1 and EXT3-Touch to the Espressif ESP32
hV_Configuration.h

    









					
									

		
	






Posted: 16 Mar 2022
Updated: