epaper-businesscard

Use Waveshare e-ink e-paper to build a business card application

E-Paper

The document of the e-paper is in wiki of WaveShare.

Connectors

  It is a 2.7 inches e-paper HAT for Raspberry Pi.  It also has another 8 pin connector for other hardware.  

4 Buttons

  There are 4 buttons only connected to Raspberry Pi HAT connector.

STM32F070 Nucleo

In order to access 4 buttons, the Nucleo board connect only to the HAT connector. There are [schematic circuit diagram] (https://www.waveshare.com/wiki/File:2.7inch_e-Paper_HAT_Schematic.pdf) for the e-paper.

Demo code and CubeMX

The orginal demo code is available in the link. I use the CubeMx to create the startup code. In order to compatible with the demo code, the setting of heap size are set to be 0x2000.

Conversion of picture

There is a program [image2lcd v2.9] provided in the wiki(https://www.waveshare.com/wiki/File:Image2Lcd.7z). There is a document about how to convert picture to data array. However, the steps doesn't work for me. I use the following steps

• Create a picture with width x height = 176 x 264
• Run the image2lcd program
• Open the picture file
• Output file type = c array
• Scan mode = horizon scan
• BitPixel = monochrome
• Max width and height = 176 264
• The following options are all off
• Check Reverse Color Then save the result

Button Function defined

• Button 1 - Show Business Card {:height="50%" width="50%"}
• Button 2 - Show WeChat QR Code {:height="50%" width="50%"}
• Button 3 - Show Line QR Code {:height="50%" width="50%"}
• Button 4 - Show Demo Picture {:height="50%" width="50%"}