Working Principle; 4-Wire Spi - Waveshare 4.2inch e-Paper Module User Manual

4.2inch e-Paper Module User Manual

WORKING PRINCIPLE

This product is an E-paper device adopting the image display technology of
Microencapsulated Electrophoretic Display, MED. The initial approach is to create tiny
spheres, in which the charged color pigments are suspending in the transparent oil
and would move depending on the electronic charge. The E-paper screen display
patterns by reflecting the ambient light, so it has no background light requirement.
Under sunshine, the E-paper screen still has high visibility with a wide viewing angle of
180 degree. It is the ideal choice for E-reading.

4-WIRE SPI

Different from the traditional SPI protocol
master is hidden since the device only has display requirement.
CS is slave chip select, when CS is low, the chip is enabled.
⚫
You can search online for more information about traditional SPI protocol
6
V2.0
, the data line from the slave to the
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