I’d like to Introduce my 5inch EPD project


image


Hi. Today I’d like to introduce my EPD project. The
EPD is electronic paper display. It is used to e-book reader. The
representative products are
Amazon Kindle and SONY e-book reader.


The
EPD has any interesting characteristics. It looks like printed paper and the
image has shown if the power is cut off.

I want to display the information (for examples
the weather forecast, the figure of atmospheric pressure change and so on) what
it get from on the internet. Now project status is that the EPD displayed image
was read from SD Card.(But it has any problems yet.)

The following figure is shown a block diagram
for that.

 epdblockdiagram

There are 5 blocks.

1. ED050SC3 Electric Paper Display

image

I choose ED050SC3(LF) from any kind of EPDs.
It is 5 inch EPD. It resolution is 800 x 600 pixels.
It used to SONY PRS-300,
Rakuten kobo mini as the e-book reader products.

The almost kind of EPD has a specially connector. It is difficult to get and expensive. ButED050SC3(LF) has FFC/FPC
connector. It is not specially connector.
I could get the connector easily.

2. ESP-WROOM-02(ESP8266) Development board

The ESP8266 is cheapest Wifi microcontroller.
I choose
ESP-WROOM-02Developer Board from any kind of ESP8266 modules. Because ESP-WROOM-02 is the only passed
the TELEC( like a Japanese FCC).If you use at out of japan, you choice NodeMCU better. May be function the same.


3. DCDC Power Convertor

The ED050SC3(LF) needs many kind of voltage
power sources. +22V, +15V, -20V, -15V, +3.3V and -2V. These are converted from +5V USB
bus power by DCDC convertor. These are also needed power on sequence and a
small scheme for -2V.


4. 16bit Shift Register

The ED050SC3(LF) needs at least 6 lines for
control signals and 8 lines for data transfer. ESP8266 has a few GPIO pins. So they
pins ware extended by two 74HC595 shift register ICs tied to SPI. But 74HC595
made some problems. I will tell you details later.


5. SD Card

The images data for display are stored to SD card.I choose micro SD card. Because it was
small.

 

Next time I will share about EPD.

Thanks reading.


Contents of the EPD project

You can buy the EPD experiment kit at our shop.

epdexpset04



コメント