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{{Infobox item
|name=2.13inch e-Paper
|name2=2.13inch e-Paper HAT
|img=[[File:2.13inch.png|300px|{{Amazon_nolink|default={{#ifeq: {{#urlget:amazon|0}}|{{#urlget:Amazon|0}}| default|}}|url=link=}}]]
|img2=[[File:2.13inch2.png|300px|{{Amazon_nolink|default={{#ifeq: {{#urlget:amazon|0}}|{{#urlget:Amazon|0}}| default|}}|url=link=}}]]
|caption=250x122, 2.13inch EPD panel
|caption2=250x122, 2.13inch EPD HAT for Raspberry Pi, Black/White, RPI SPI interface
|category=[[:Category:OLEDs / LCDs|OLEDs / LCDs]], [[:Category:LCD|LCD]]
|{{#ifeq: {{#urlget:amazon|0}}|{{#urlget:Amazon|0}}| default|}}=display
|website_cn=[ 官方中文站点]
|website_en=[ Waveshare website]
{{Product List|OLEDs / LCDs/e-Paper}}
<div class="tabber">
<div class="tabbertab" title="Introduction">
<div class="tabber">
<div class="tabbertab" title="Introduction">
{{E-Paper Raw Panel}}
250x122, 2.13inch EPD (Electronic Paper Display) HAT for Raspberry Pi, SPI interface
{{Amazon|{{#ifeq: {{#urlget:amazon|0}}|{{#urlget:Amazon|0}}| default|}}=display
|More = [ More]}}
*'''Due to the chip upgrade, the 2.13inch e-Paper V2 will be upgraded to its V3, the new and old demos are not compatible, but their appearances and functions are compatible. If you are an old customer and need to purchase a new screen again, please pay attention to the update program. If you purchase it for the first time, and there is a V3 label on the back of the screen, just use the V3 demo directly. (December 2021)'''</font><br>
*'''If the screen  with the partial mode of the V3 is slow, you can change the refreshing speed by modifying the waveform in EPD_2in13_V3.c. If the value is reduced, the speed will be accelerated. However, when the refreshing speed is improved, the color of the screen with the partial mode will fade.'''</font>
==Driver Board==
The version of the driver board and the screen are independent. The current version of the driver board is Rev2.1, with power-off function and level conversion function. The driver to be used is mainly selected according to the screen version.
*Dimension: 2.13inch
*Outline dimension (raw panel): 59.2mm x 29.2mm x 1.05mm
*Outline dimension (driver board): 65mm x 30.2mm
*Display dimension: 48.55mm x 23.71mm
*Working voltage: 3.3V/5V
*Communication interfaces: SPI
*Pixel pitch: 0.194 * 0.194
*Resolution: 250*122
*Display color: Black, White
*Gray level: 2
*Partial refreshing time: 0.3s
*Full refresh time: 2s
*Refresh Power Consumption: 26.4mW(typ.)
*Standby current: <0.01uA(close to0)
1.Refresh time: The refresh time is the experimental results, the actual refresh time will have errors, and the actual effect shall prevail. There will be a flickering effect during the global refresh process, this is a normal phenomenon
<br />
2.Power consumption: The power consumption data is the experimental results. The actual power consumption will have a certain error due to the existence of the driver board and the actual use situation. The actual effect shall prevail.
==SPI Communication Timing==
Since the ink screen only needs to be displayed, the data cable (MISO) sent from the machine and received by the host is hidden here.
*CS: Slave chip select, when CS is low, the chip is enabled
*DC: data/command control pin, write command when DC=0; write data when DC=1
*SCLK: SPI communication clock
*SDIN: SPI communication master sends, slave receives
*Timing: CPHL=0, CPOL=0 (SPI0)
[Remarks] For specific information about SPI, you can search for information online.<big>
= 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 suspended 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 ambient light, the E-paper screen still has high visibility with a wide viewing angle of 180 degrees. It is the ideal choice for E-reading. ('''Note that the e-Paper cannot support updating directly under sunlight''')
===Pixel & Byte===
We define the pixels in a monochrome picture, 0 is black and 1 is white.<br />
White:□: Bit 1<br />
Black:■: Bit 0<br />
*The dot in the figure is called a pixel. As we know, 1 and 0 are used to define the color, therefore we can use one bit to define the color of one pixel, and 1 byte = 8pixels<br />
*For example, If we set the first 8 pixels to black and the last 8 pixels to white, we show it by codes, they will be 16 bit as below:<br />
[[file:e-paper_hardware_work_1.png]]<br />
For computer, the data is saved in MSB format:<br />
[[file:e-paper_hardware_work_2.png]]<br />
So we can use two bytes for 16 pixels.<br />
#For the screen that supports partial update, please note that you cannot refresh the screen with the partial mode all the time. After several partial updating, you need to fully refresh the screen once. Otherwise, the screen display effect will be abnormal, which cannot be repaired!<br/>
#Because of the different batches, some of them have aberrations. Store the e-Paper right side up will reduce it. And if the e-Paper didn't be refreshed for a long time, it will become more and more reddish/yellowish. Please use the demo code to refresh the e-paper several times in this case.<br/>
#Note that the screen cannot be powered on for a long time. When the screen is not refreshed, please set the screen to sleep mode, or power off the e-Paper. Otherwise, the screen will remain in a high voltage state for a long time, which will damage the e-Paper and cannot be repaired!<br/>
#When using the e-Paper, it is recommended that the refresh interval be at least 180s, and refresh at least once every 24 hours. If the e-Paper is not used for a long time, the ink screen should be brushed and stored. (Refer to the datasheet for specific storage environment requirements)<br/>
#After the screen enters sleep mode, the sent image data will be ignored, and it can be refreshed normally only after initializing again.<br/>
#Control the 0x3C or 0x50 (refer to the datasheet for details) register to adjust the border color. In the routine, you can adjust the Border Waveform Control register or VCOM AND DATA INTERVAL SETTING to set the border.<br/>
#If you find that the created image data is displayed incorrectly on the screen, it is recommended to check whether the image size setting is correct, change the width and height settings of the image and try again.<br/>
#The working voltage of the e-Paper is 3.3V. If you buy the raw panel and you need to add a level convert circuit for compatibility with 5V voltage. The new version of the driver board (V2.1 and subsequent versions) has added a level processing circuit, which can support both 3.3V and 5V working environments. The old version can only support a 3.3V working environment. You can confirm the version before using it. (The one with the 20-pin chip on the PCB is generally the new version)<br/>
#The FPC cable of the screen is relatively fragile, pay attention to bending the cable along the horizontal direction of the screen when using it, and do not bend the cable along the vertical direction of the screen<br/>
#The screen of e-Paper is relatively fragile, please try to avoid dropping, bumping, and pressing hard.<br/>
#We recommend that customers use the sample program provided by us to test with the corresponding development board after they get the screen.<br/>
<div class="tabbertab" title="User Guides of Pi">
<div style="background-color: #343434;text-align: center;color: white;padding: 20px;margin: 8px;">
We provide several examples for testing, you first test the e-Paper by following the guides. If your developing board is different, you need to write your codes yourself by following the resources.
=2.13inch e-Paper HAT Manual=
{{Raspberry Pi Guides for SPI e-Paper}}
|content =
|heading = Introduction
|content = Parameters, principles and precautions}}
<div class="tabbertab" title="User Guides of Jetson Nano">
{{StudyCard|img=[[File:Rapberry Pi.jpg|110px|link=]]
{{Jetson Nano Guides for SPI e-Paper}}
|heading = Working with Raspberry Pi
|content = User guides for the development demo of C language, Python}}
<div class="tabbertab" title="User Guides of STM32">
{{STM32 Guides for SPI e-Paper}}
|heading = Working with the Arduino
|content = User guides for the development demo based on Arduino UNO R3}}
<div class="tabbertab" title="User Guides of Arduino">
{{StudyCard|img=[[File:Jetson Arduino00.jpg|110px|link=]]
{{Arduino Guides for SPI e-Paper}}
|heading = Working with the Jetson Nano
|content = User guides for the development demo of C language, Python}}
<div class="tabbertab" title="User Guides of ESP32">
{{StudyCard|img=[[File:Sunrise X3 Pi.jpg|110px|link=]]
{{ESP32 Guides for SPI e-Paper}}
|heading = Working with Sunrise X3 Pi
|content = User guides for the development demo based on Python}}
<div class="tabbertab" title="User Guides of ESP8266">
{{ESP8266 Guides for SPI e-Paper}}
|heading = Working with the STM32
|content = User guides for the development demo based on STM32CubeMX}}
=== Display a Frame (DisplayFrame) ===
|heading = Working with ESP32/8266
DisplayFrame is used to send a frame to the module, and the screen will refresh and display it.
|content = User guides for ESP32/8266}}
Process: Send command data start transmission 1 -> Send data of an image to display -> Refresh the screen.
|heading = Resources
|content = Documentation, procedures and data sheets, etc}}
* About the image data: 4 bits = 1 pixel, doesn’t support Gray scale (can only display black and white). 0000 (binary) stands for a black pixel, otherwise 0011 (binary) stands for a white pixel.
|heading = FAQ
|content = e-Paper frequently asked questions}}
For example:
|heading = Support
0x00: 2 pixels ■■
|content = Technical support
0x03: 2 pixels ■□
0x30: 2 pixels □■
0x33: 2 pixels □□
but 0x66: the state of pixels is uncertain
* This module doesn’t support partial refresh.
* The refresh rate of this module is slow (about 6s), and it will flicker for several times during refreshing. Please be patient.
<div class="tabbertab" title="Resources">
{{Commom Instruction of SPI e-paper}}
* [[:File:E-Paper-Driver-HAT-Schematic.pdf|Schematic]]
==Demo code==
*[https://{{SERVERNAME}}/w/upload/3/39/E-Paper_code.7z demo]
*[ Github]
*[ 2.13inch e-Paper Specification V2]
*[ 2.13inch e-Paper Specification V3 version](Newest)
==Related Resources==
*[ Waveshare e-Paper display with SPI]
*[ Pisugar case]
<div class="tabbertab" title="FAQ">
= FAQ =
{{e-paper Hat FAQ}}

Latest revision as of 06:01, 24 March 2023

2.13inch e-Paper HAT Manual

E-Paper Introduction 4.jpg


Parameters, principles and precautions
Rapberry Pi.jpg

Working with Raspberry Pi

User guides for the development demo of C language, Python

Working with the Arduino

User guides for the development demo based on Arduino UNO R3
Jetson Arduino00.jpg

Working with the Jetson Nano

User guides for the development demo of C language, Python
Sunrise X3 Pi.jpg

Working with Sunrise X3 Pi

User guides for the development demo based on Python

Working with the STM32

User guides for the development demo based on STM32CubeMX
E-Paper ESP32.jpg

Working with ESP32/8266

User guides for ESP32/8266


Documentation, procedures and data sheets, etc


e-Paper frequently asked questions


Technical support