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{{#tweekihide:firstHeading|sidebar-left|sidebar-right}}__NOTOC__
{{Infobox item
 
|name=4.2inch e-Paper (C)
 
|name2=4.2inch e-Paper Module (C)
 
|img=[[File:4.2inch-e-Paper-C-1.jpg|300px|{{Amazon_nolink|default={{#ifeq: {{#urlget:amazon|0}}|{{#urlget:Amazon|0}}| default|}}|url=link=https://www.waveshare.com/4.2inch-e-Paper-C.htm}}]]
 
|img2=[[File:4.2inch-e-Paper-Module-C-4.jpg|300px|{{Amazon_nolink|default={{#ifeq: {{#urlget:amazon|0}}|{{#urlget:Amazon|0}}| default|}}|url=link=https://www.waveshare.com/4.2inch-e-Paper-Module-C.htm}}]]
 
|caption=400x300, 4.2inch EPD panel
 
|caption2=400x300, 4.2inch EPD module, three-color, SPI interface
 
|category=[[:Category:OLEDs / LCDs|OLEDs / LCDs]], [[:Category:LCD|LCD]]
 
|brand=Waveshare
 
|{{#ifeq: {{#urlget:amazon|0}}|{{#urlget:Amazon|0}}| default|}}=display
 
|website_cn=[http://www.waveshare.net/shop/4.2inch-e-Paper-Module-C.htm 官方中文站点]
 
|website_en=[https://www.waveshare.com/4.2inch-e-Paper-Module-C.htm Waveshare website]
 
|interface1=SPI
 
|related=
 
{{Product List|OLEDs / LCDs/e-Paper}}
 
}}
 
'''Note:''' Besides the display, this e-Paper is same as the 4.2inch e-Paper Module (B). For information and instruction, you can refer to the wiki page of 4.2inch e-Paper Module (B)
 
*[[4.2inch e-Paper Module (B)]]
 
=Introduction=
 
==Feature==
 
*Dimension: 4.2inch
 
*Outline dimensions(raw panel): 90.1mm x 77.0mm x 1.18mm
 
*Outline dimensions: 103.0mm x 78.5mm
 
*Display size: 84.8mm x 63.6mm
 
*Operating voltage: 3.3V/5V
 
*Interface: SPI
 
*Dot pitch: 0.212 x 0.212
 
*Resolution: 400 x 300
 
*Display color: Black/White/Yellow
 
*Grey level: 2
 
*Full refresh: 15s
 
*Refresh power: 26.4mW(typ.)
 
*Standby current: <0.01uA(almost none)
 
[Note]:
 
Refresh time: The refresh time is the experimental test data, 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
 
  
Power consumption: The power consumption data is the experimental test data. 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.
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<div style="background-color: #343434;text-align: center;color: white;padding: 20px;margin: 8px;">
==SPI Communication Timing==
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=4.2inch e-Paper Module (C) Manual=
[[File:1.54inch-e-paper-manual-1.png|400px]]
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</div>
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<p></p>
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{{ContentGrid|grid-gap=25px
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|content =
  
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.
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{{StudyCard
*CS: Slave chip select, when CS is low, the chip is enabled
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|img=[[File:Start-test1.png|121px|link=https://www.waveshare.com/wiki/4.2inch_e-Paper_Module_(C)_Manual#Introduction]]
*DC: data/command control pin, write command when DC=0; write data when DC=1
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|heading = Introduction
*SCLK: SPI communication clock
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|content = Parameters, principles, and precautions
*SDIN: SPI communication master sends, slave receives
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}}
*Timing: CPHL=0, CPOL=0 (SPI0)
 
[Remarks] For specific information about SPI, you can search for information online.<big>
 
  
==Working principle==
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{{StudyCard
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.
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|img=[[File:Remote-access-test1.png|121px|link=https://www.waveshare.com/wiki/4.2inch_e-Paper_Module_(C)_Manual#Users_Guides_of_Raspberry_Pi]]
('''Note that the e-Paper cannot support updating directly under sunlight''')
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|heading = Start with Raspberry Pi
===Pixel & Byte===
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|content = Using BCM2835, WiringPi, file IO, RPI (Python) library development routines and instructions
We define the pixels in a monochrome picture, 0 is black and 1 is white.<br />
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}}
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 />
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{{StudyCard
[[file:e-paper_hardware_work_2.png]]<br />
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|img=[[File:Linux-test1.png|121px|link=https://www.waveshare.com/wiki/4.2inch_e-Paper_Module_(C)_Manual#User_Guides_of_Jetson_Nano]]
So we can use two bytes for 16 pixels.<br />
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|heading = Start with the Jetson Nano
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|content = Use C language, Python developed routines and instructions
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}}
  
*For 4.2inch e-paper C, it is black, white and yellow
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{{StudyCard
We need to split the picture into 2 pictures, one black and white picture, one yellow and white picture, because one register controls the black and white display during transmission, and the other register controls the yellow and white display. 1 byte of black and white part controls 8 pixels, 1 byte of yellow and white part can control 8 pixels<br/>
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|img=[[File:Config-test1.png|121px|link=https://www.waveshare.com/wiki/4.2inch_e-Paper_Module_(C)_Manual#User_Guides_of_STM32]]
For example, suppose there are 8 pixels, the front 4 are yellow and the back 4 are black: You need to split them into a black and white picture, a red and white picture, these two pictures are 8 pixels, but The first four pixels of the black and white picture are white, and the last four pixels are black, while the first four pixels of the yellow-white picture are yellow, and the last four pixels are white;<br/>
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|heading = Starting from the STM32
[[File: 4.2inch e-Paper Module (C).png]]<br/>
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|content = Use STM32CubeMX to develop routines based on STM32F103ZET6 and their usage instructions
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}}
  
If we specify that white is stored as 1 and red or black is stored as 0, then we have the following representation:<br/>
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{{StudyCard
[[File:4.2inch e-Paper Module (C)2.png]]<br/>
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|img=[[File:Tinker Board 2硬件-test1.png|121px|link=https://www.waveshare.com/wiki/4.2inch_e-Paper_Module_(C)_Manual#User_Guides_of_Arduino]]
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|heading = Starting from the Arduino
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|content = Routines developed based on Arduino UNO R3 and their usage instructions
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}}
  
As mentioned above, the black and white part means that 8 pixels need 1 byte, and 1 byte to control yellow and white controls 8 pixels;<br/>
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{{StudyCard
[[File:4.2inch e-Paper Module (C)3.png]]<br/>
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|img=[[File:Linux-test1.png|121px|link=https://www.waveshare.com/wiki/4.2inch_e-Paper_Module_(C)_Manual#Resource]]
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|heading = Resources
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|content = Documentation, procedures and data sheets, etc
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}}
  
==Precautions==
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{{StudyCard
#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/>
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|img=[[File:显示屏-test1.png|121px|link=https://www.waveshare.com/wiki/4.2inch_e-Paper_Module_(C)_Manual#FAQ]]
#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/>
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|heading = FAQ
#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/>
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|content = e-Paper frequently asked questions
#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/>
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}}
#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/>
 
  
{{Raspberry Pi Guides for SPI e-Paper}}
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{{StudyCard
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|img=[[File:数据表-test1.png|121px|link=https://www.waveshare.com/wiki/4.2inch_e-Paper_Module_(C)_Manual#Support]]
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|heading = Support
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|content = Technical support
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}}
  
{{Jetson Nano Guides for SPI e-Paper}}
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}}
 
 
{{STM32 Guides for SPI e-Paper}}
 
 
 
{{Arduino Guides for SPI e-Paper}}
 
 
 
 
 
=Resource=
 
== Documentation ==
 
*[https://www.waveshare.com/w/upload/2/20/4.2inch-e-paper-module-user-manual-en.pdf User Manual]
 
{{Commom Instruction of SPI e-paper}}
 
* [[:File:4.2inch_e-Paper_Schematic.pdf|Schematic]]
 
 
 
== Demo code ==
 
*[https://github.com/waveshare/e-Paper Github]
 
 
 
== Datasheets ==
 
*[https://www.waveshare.net/w/upload/7/7f/4.2inch-e-paper-b-specification.pdf datasheet]
 
 
 
==Related Resources==
 
Notice:<br />
 
The projects listed are all made and shared by the project owners, Waveshare isn't responsible for project either the update.<br />
 
*[https://forum.arduino.cc/index.php?topic=487007.0 Waveshare e-Paper display with SPI]
 
:This is a post in Arduino Form about our SPI e-Paper thanks to ZinggJM, maybe you want to refer to.
 
*[https://github.com/aceisace/Inkycal Inkycal Project]
 
:This is the Inkycal project for reference.
 
</div>
 
<div class="tabbertab" title="FAQ">
 
 
 
<div class="wiki-pages jet-green-color">
 
= FAQ =
 
{{e-paper Hat FAQ}}
 
 
 
 
 
{{Service00}}
 

Latest revision as of 10:12, 21 July 2022


4.2inch e-Paper Module (C) Manual

Start-test1.png

Introduction

Parameters, principles, and precautions
Remote-access-test1.png

Start with Raspberry Pi

Using BCM2835, WiringPi, file IO, RPI (Python) library development routines and instructions
Linux-test1.png

Start with the Jetson Nano

Use C language, Python developed routines and instructions
Config-test1.png

Starting from the STM32

Use STM32CubeMX to develop routines based on STM32F103ZET6 and their usage instructions
Tinker Board 2硬件-test1.png

Starting from the Arduino

Routines developed based on Arduino UNO R3 and their usage instructions
Linux-test1.png

Resources

Documentation, procedures and data sheets, etc
显示屏-test1.png

FAQ

e-Paper frequently asked questions
数据表-test1.png

Support

Technical support