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{{Infobox item
|img=<div class="tabber"><div class="tabbertab" title="2.9inch e-Paper">[[File:2.9inch-e-Paper-1.jpg|300px|{{Amazon_nolink|default={{#ifeq: {{#urlget:amazon|0}}|{{#urlget:Amazon|0}}| default|}}|url=link=}}]]</div><div class="tabbertab" title="2.9inch e-Paper Module">[[File:2.9inch-e-paper-module-4.jpg|300px|{{Amazon_nolink|default={{#ifeq: {{#urlget:amazon|0}}|{{#urlget:Amazon|0}}| default|}}|url=link=}}]]</div>
|caption=296x128, 2.9inch EPD panel
|caption2=296x128, 2.9inch EPD module, 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">
<font backgound=white; color=#DD1223>
*The 2.9inch e-Paper raw panel was updated to the V2 version. The controller and the driver codes are different and the codes of the two versions are not compatible with each other. Except for the software, the outline of the two versions is the same. If you are the regulars of this display, please note that you need to update your driver codes with the new version refer to our new examples for the V2 version. if your the first time buy and use this display, just need to download and use the new V2 examples. The V2 version has a "V2" sticker on the backside of the display panel. Please confirm the version by the sticker.
*If you feel that the partial brushing of the V3 is slow, you can modify the refresh speed by modifying the waveform in EPD_2in13_V3.c. If the value is reduced, the refresh speed will be accelerated.
[[File:e-paper screen.png]]<br/>
===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 shifting function. The driver to use is mainly selected according to the screen version.
{{Amazon|{{#ifeq: {{#urlget:amazon|0}}|{{#urlget:Amazon|0}}| default|}}=display
|More = [ More]}}
*Dimension: 2.9inch
*Outline dimension (only screen): 79.0mm x 36.7mm x 1.05mm
*Outline dimension (driver board): 89.5mm x 38mm
* Display dimension: 66.89mm x 29.05mm
*Working voltage: 3.3V/5V
*Communication interfaces: SPI
*Dot spacing: 0.227 x 0.226
*Resolution: 296*128
*Display color: Black, White
*Gray level: 2
*Partial refresh: 0.3s
*Global refresh: 2s
*Refresh Power Consumption: 26.4mW(typ.)
*Sleep current: <0.01uA(close to 0)
*Note: 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
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/>
{{Raspberry Pi Guides for SPI e-Paper}}
<div style="background-color: #343434;text-align: center;color: white;padding: 20px;margin: 8px;">
=2.9inch e-Paper Module Manual=
<div class="tabbertab" title="User Guides of Jetson Nano">
|content =  
{{Jetson Nano Guides for SPI e-Paper}}
<div class="tabbertab" title="User Guides of STM32">
|heading = Introduction
|content = Parameters, principles, and precautions
{{STM32 Guides for SPI e-Paper}}
<div class="tabbertab" title="User Guides of Arduino">
|heading = Start with Raspberry Pi
|content = Using BCM2835, WiringPi, file IO, RPI (Python) library development routines and instructions
{{Arduino Guides for SPI e-Paper}}
<div class="tabbertab" title="User Guides of ESP32">
|heading = Start with the Jetson Nano
|content = Use C language, Python developed routines and instructions
{{ESP32 Guides for SPI e-Paper}}
<div class="tabbertab" title="User Guides of ESP8266">
|heading = Starting from the STM32
|content = Use STM32CubeMX to develop routines based on STM32F103ZET6 and their usage instructions
{{ESP8266 Guides for SPI e-Paper}}
|img=[[File:Tinker Board 2硬件-test1.png|121px|link=]]
|heading = Starting from the Arduino
=== Set the frame memory (SetFrameMemory) ===
|content = Routines developed based on Arduino UNO R3 and their usage instructions
SetFrameMemory is used to write image data to the memory.
* Process:  
:: Set the area size (see the function SetMemoryArea) -> set the start point (see the function SetMemoryPointer) -> send the command ''Write RAM'' -> start image data transfer.  
* The module has two memory areas. Once DisplayFrame is invoked, the following action of SetFrameMemory will set the other memory area, e.g. to set all the two memory areas, the process is: SetFrameMemory -> DisplayFrame -> SetFrameMemory -> DisplayFrame, i.e. set and update twice.
* The data from SPI interface is first saved into the memory and then updated if the module received the update command.
* About the image to be sent: 1 byte = 8 pixels, doesn’t support Gray scale (Can only display black and white). A bit set stands for a white pixel, otherwise a bit reset stands for a black pixel.
For example:
0xC3:8 pixels □□■■■■□□
0x00:8 pixels ■■■■■■■■
0xFF:8 pixels □□□□□□□□
0x66:8 pixels ■□□■■□□■
<div class="tabbertab" title="Resources">
== Documentation ==
*[ User Manual]
|heading = Resources
{{Commom Instruction of SPI e-paper}}
|content = Documentation, procedures and data sheets, etc
* [[:File:2.9inch_e-Paper_Schematic.pdf|Schematic]]
== Demo code ==
*[ Github]
|heading = FAQ
|content = e-Paper frequently asked questions
== Code shared from users ==
Thanks to Martin, who share his code which was modified for particle photon wifi dev kit
|heading = Support
|content = Technical support
== Datasheets ==
* [[:File:1.54inch_e-Paper_Datasheet.pdf|1.54inch_e-Paper_Datasheet.pdf]]
* [[:File:2.13inch_e-Paper_Datasheet.pdf|2.13inch_e-Paper_Datasheet.pdf]]
* [[:File:2.9inch_e-Paper_Datasheet.pdf|2.9inch_e-Paper_Datasheet.pdf]]
* [ 2.9inch e-Paper V2 Specification]
==Related Resources==
This is a post in Arduino Form about our SPI e-Paper thanks to ZinggJM, maybe you want to refer to.
*[ Waveshare e-Paper display with SPI]
==Relate applications==
<div class="tabbertab" title="FAQ">
{{e-paper Hat FAQ}}

Latest revision as of 09:58, 21 July 2022

2.9inch e-Paper Module Manual



Parameters, principles, and precautions

Start with Raspberry Pi

Using BCM2835, WiringPi, file IO, RPI (Python) library development routines and instructions

Start with the Jetson Nano

Use C language, Python developed routines and instructions

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


Documentation, procedures and data sheets, etc


e-Paper frequently asked questions


Technical support