Waveshare E-Paper Display

The waveshare_epaper display platform allows you to use some E-Paper displays sold by Waveshare with esphomelib. Similar modules sold by other vendors might also work but not have been tested yet. Currently only single-color E-Ink displays are implemented and of those only a few modules.

../../../_images/waveshare_epaper-full.jpg

Waveshare E-Paper 2.9 Inch E-Paper Display.

The communication esphomelib has chosen to use for this integration is 4-wire SPI, as it’s the most stable and high-speed. So you need to make sure your board is set to the 4-wire SPI mode and have an spi: section in your configuration.

E-Paper Pin ESP Pin esphomelib Option
VCC 3.3V N/A
GND GND N/A
CLK Any GPIO spi.clk_pin
DIN Any GPIO spi.mosi_pin
CS Any GPIO cs_pin
DC Any GPIO dc_pin
BUSY (Optional) Any GPIO busy_pin
RESET (Optional) Any GPIO reset_pin
../../../_images/waveshare_epaper-pins.jpg
# Example configuration entry
spi:
  clk_pin: D0
  mosi_pin: D1

display:
  - platform: waveshare_epaper
    cs_pin: D2
    dc_pin: D3
    busy_pin: D4
    reset_pin: D5
    model: 2.90in
    full_update_every: 30
    lambda: |-
      it.print(0, 0, id(font), "Hello World!");

Configuration variables:

  • cs_pin (Required, Pin Schema): The CS pin.
  • dc_pin (Required, Pin Schema): The DC pin.
  • model (Required): The model of the E-Paper display. Options are:
    • 1.54in
    • 2.13in (not tested)
    • 2.70in (not tested)
    • 2.90in
    • 4.20in (not tested)
    • 7.50in (not tested)
  • busy_pin (Optional, Pin Schema): The BUSY pin. Defaults to not connected.
  • reset_pin (Optional, Pin Schema): The RESET pin. Defaults to not connected. Make sure you pull this pin high (by connecting it to 3.3V with a resistor) if not connected to a GPIO pin.
  • rotation (Optional): Set the rotation of the display. Everything you draw in lambda: will be rotated by this option. One of (default), 90°, 180°, 270°.
  • full_update_every (Optional, int): E-Paper displays have two modes of switching to the next image: A partial update that only changes the pixels that have changed and a full update mode that first clears the entire display and then re-draws the image. The former is much quicker and nicer, but every so often a full update needs to happen because artifacts accumulate. On the 1.54in, 2.13in and 2.90in models you have the option to switch only do a full-redraw every x-th time using this option. Defaults to 30 on the described models and a full update for all other models.
  • lambda (Optional, lambda): The lambda to use for rendering the content on the display. See Display Rendering Engine for more information.
  • update_interval (Optional, Time): The interval to re-draw the screen. Defaults to 10s.
  • spi_id (Optional, ID): Manually specify the ID of the SPI Component if you want to use multiple SPI buses.
  • id (Optional, ID): Manually specify the ID used for code generation.