e-Paper Display

What is to like

  • very wide viewing angle
  • very low power
  • sunlight viewable
  • retains image when powered off
  • high resolution
  • work on Uno and Nano boards!

What is not to like

  • no manual or documentation except for the demo code and library files.
  • demo does not compile
  • hook up not document.
  • demo is not well presented
  • some ghosting of previous image
  • awkward coding
  • 3.3v and not 5v tolerant  (at least not said in the controller chip datasheet).

Library fixes

  1. replace <spi.h> with <SPI.h>
  2. replace <arduino.h> with <Arduino.h>

Hook up (Uno/Nano)

  • BUSY <-> D7 (INPUT)
  •  RST   <-> D8 (OUTPUT)
  •  DC    <-> D9 (OUTPUT)
  •  CS     <-> D10 (OUTPUT) 
  •  SPI (2 MHz):
  •      CS   <-> D10 (SS)
  •      DIN  <-> D11 (MOSI)
  •      CLK <-> D13 (SCLK)

Surprises

The native screen orientaion is rotated (and upside down?):

Interfacing a 5v systm to a 3.3v system

There are a number of ways of interfacing a 5v system with a 3.3v system. In my case I used a signal diode (2n4148) and a 1k resistor (you could experiment with higher the resistor values to reduce power consumption.):

Here is the interface board:


Work to do

Although the demo once fixed up works nicely, the library needs simple some commands like that in the LCD library, like:

  • lcd.setCursor(), and
  • lcd.print()

However, I do think the rotated native orientation has merit for small displays.

Pretty happy with this display over all.

Magic