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.
Note: Different from the traditional SPI protocol, the data line from the slave to the master is hidden since the device only has display requirement.
SPI communication has data transfer timing, which is combined by CPHA and CPOL.
As you can see from the figure above, data transmission starts at the first falling edge of SCLK, and 8 bits of data are transferred in one clock cycle. In here, SPI0 is in used, and data is transferred by bits, MSB first.
If you want to connect your E-paper screen to Raspberry Pi, you should install some necessary libraries, or else the Demo (click to download) below may work improperly. For more information about how to install the Raspberry Pi libraries, please visit the website: Libraries Installation for RPi.
You can find the detailed presentation about the installations of libraries wiringPi, bcm2835 and python.
Here is the connection between Raspberry Pi 3B and E-paper.
Here we use the development board STMF103C8T6. The Demo is base on the library HAL.
Here is the hardware connection between the development board STMF103C8T6 and E-paper:
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