Difference between revisions of "7.5inch e-Paper HAT (C)"
From Waveshare Wiki
m (Text replacement - "https://www.waveshare.com/w/upload/" to "https://files.waveshare.com/upload/") |
|||
| (11 intermediate revisions by 4 users not shown) | |||
| Line 1: | Line 1: | ||
| + | <div class="wiki-pages jet-green-color"> | ||
{{Infobox item | {{Infobox item | ||
|name=7.5inch e-Paper (C) | |name=7.5inch e-Paper (C) | ||
|name2=7.5inch e-Paper HAT (C) | |name2=7.5inch e-Paper HAT (C) | ||
| − | |img=[[File:7.5inch-e-Paper-C-1.jpg|300px|link=https://www.waveshare.com/7.5inch-e-Paper-C.htm]] | + | |img=[[File:7.5inch-e-Paper-C-1.jpg|300px|{{Amazon_nolink|default={{#ifeq: {{#urlget:amazon|0}}|{{#urlget:Amazon|0}}| default|}}|url=link=https://www.waveshare.com/7.5inch-e-Paper-C.htm}}]] |
| − | |img2=[[File:7.5inch-e-Paper-HAT-C-5.jpg|300px|link=https://www.waveshare.com/7.5inch-e-Paper-HAT-C.htm]] | + | |img2=[[File:7.5inch-e-Paper-HAT-C-5.jpg|300px|{{Amazon_nolink|default={{#ifeq: {{#urlget:amazon|0}}|{{#urlget:Amazon|0}}| default|}}|url=link=https://www.waveshare.com/7.5inch-e-Paper-HAT-C.htm}}]] |
| − | |caption=800x480, 7.5inch | + | |caption=800x480, 7.5inch EPD panel |
| − | |caption2=800x480, 7.5inch | + | |caption2=800x480, 7.5inch EPD HAT for Raspberry Pi, three-color, SPI interface |
|category=[[:Category:OLEDs / LCDs|OLEDs / LCDs]], [[:Category:LCD|LCD]] | |category=[[:Category:OLEDs / LCDs|OLEDs / LCDs]], [[:Category:LCD|LCD]] | ||
|brand=Waveshare | |brand=Waveshare | ||
| − | |{{#urlget:amazon|default}}=display | + | |{{#ifeq: {{#urlget:amazon|0}}|{{#urlget:Amazon|0}}| default|}}=display |
|website_cn=[http://www.waveshare.net/shop/7.5inch-e-Paper-HAT-C.htm 官方中文站点] | |website_cn=[http://www.waveshare.net/shop/7.5inch-e-Paper-HAT-C.htm 官方中文站点] | ||
|website_en=[https://www.waveshare.com/7.5inch-e-Paper-HAT-C.htm Waveshare website] | |website_en=[https://www.waveshare.com/7.5inch-e-Paper-HAT-C.htm Waveshare website] | ||
| Line 16: | Line 17: | ||
}} | }} | ||
| − | '''Note | + | |
| − | *[[7. | + | <div class="tabber"> |
| + | <div class="tabbertab" title="Introduction"> | ||
| + | = Introduction = | ||
| + | |||
| + | {{E-Paper Raw Panel}} | ||
| + | |||
| + | 640x384, 7.5inch EPD (Electronic Paper Display) HAT for Raspberry Pi, three-color, SPI interface | ||
| + | |||
| + | |||
| + | {{Amazon|{{#ifeq: {{#urlget:amazon|0}}|{{#urlget:Amazon|0}}| default|}}=display | ||
| + | |More = [http://www.waveshare.com/7.5inch-e-paper-hat-c.htm More]}} | ||
| + | |||
| + | = Interfaces = | ||
| + | {|class="wikitable" | ||
| + | |- | ||
| + | | VCC || 3.3V | ||
| + | |- | ||
| + | | GND || GND | ||
| + | |- | ||
| + | | DIN || SPI MOSI | ||
| + | |- | ||
| + | | CLK || SPI SCK | ||
| + | |- | ||
| + | | CS || SPI chip select (Low active) | ||
| + | |- | ||
| + | | DC || Data/Command control pin (High for data, and low for a command) | ||
| + | |- | ||
| + | | RST || External reset pin (Low for reset) | ||
| + | |- | ||
| + | | BUSY || Busy state output pin (Low for busy) | ||
| + | |} | ||
| + | = 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 suspending 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''') | ||
| + | ; Communication protocol | ||
| + | ---- | ||
| + | [[File:1.54inch-e-paper-manual-1.png|400px]] | ||
| + | |||
| + | Note: Different from the traditional SPI protocol, the data line from the slave to the master is hidden since the device only has a display requirement. | ||
| + | * CS is slave chip select, when CS is low, the chip is enabled. | ||
| + | * DC is data/command control pin, when DC = 0, write command, when DC = 1, write data. | ||
| + | * SCLK is the SPI communication clock. | ||
| + | * SDIN is the data line from the master to the slave in SPI communication. | ||
| + | SPI communication has data transfer timing, which is combined by CPHA and CPOL. | ||
| + | # CPOL determines the level of the serial synchronous clock at an idle state. When CPOL = 0, the level is Low. However, CPOL has little effect on the transmission. | ||
| + | # CPHA determines whether data is collected at the first clock edge or at the second clock edge of the serial synchronous clock; when CPHL = 0, data is collected at the first clock edge. | ||
| + | * There are 4 SPI communication modes. SPI0 is commonly used, in which CPHL = 0, CPOL = 0. | ||
| + | As you can see from the figure above, data transmission starts at the first falling edge of SCLK, and 8 bits of data are transferred in one clock cycle. Here, SPI0 is in used, and data is transferred by bits, MSB first. | ||
| + | {{e-Paper Codes Description}} | ||
| + | <!-- | ||
| + | === Display a Frame (DisplayFrame) === | ||
| + | DisplayFrame is used to send a frame to the module, and the screen will refresh and display it. | ||
| + | |||
| + | Process: Send command data start transmission 1 -> Send data of an image to display -> Refresh the screen. | ||
| + | |||
| + | Note: | ||
| + | * 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, 0011 (binary) stands for a white pixel, 0100 (binary) stands for a red pixel. | ||
| + | |||
| + | For example： | ||
| + | : 0x00: 2 pixels ■■ | ||
| + | : 0x03: 2 pixels ■□ | ||
| + | : 0x30: 2 pixels □■ | ||
| + | : 0x33: 2 pixels □□ | ||
| + | : 0x04: 2 pixels ■<font color=red>■</font> | ||
| + | : 0x43: 2 pixels <font color=red>■</font>□ | ||
| + | : but 0x66: the state of pixels is uncertain | ||
| + | </pre> | ||
| + | * This module doesn’t support partial refresh. | ||
| + | * The refresh rate of this module is slow (about 31s), and it will flicker for several times during refreshing. Please be patient. | ||
| + | --> | ||
| + | <div class="tabbertab" title="Resources"> | ||
| + | == Resources == | ||
| + | |||
| + | = Documentation = | ||
| + | |||
| + | {{Commom Instruction of SPI e-paper}} | ||
| + | * [[:File:E-Paper-Driver-HAT-Schematic.pdf|Schematic]] | ||
| + | |||
| + | = Demo code = | ||
| + | *[https://github.com/waveshare/e-Paper Github] | ||
| + | |||
| + | = Datasheets = | ||
| + | * [https://files.waveshare.com/upload/2/29/7.5inch_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. | ||
| + | *[https://github.com/aceisace/E-Paper-Calendar-with-iCal-sync-and-live-weather E-Paper Calendar with iCal sync and live weather (shared by user)] | ||
| + | |||
| + | = FAQ = | ||
| + | <!--{{e-Paper FAQ}}--> | ||
| + | {{e-Paper FAQ}} | ||
| + | =Support= | ||
| + | {{Servicebox1}} | ||
Latest revision as of 14:46, 31 August 2023
| ||
| ||
Introduction
Note: As the raw panel requires a driver board, we recommend you to buy the HAT or buy a driver board for use, or you need to make the driver board by yourself. And this instruction is based on the version with PCB or driver board.
640x384, 7.5inch EPD (Electronic Paper Display) HAT for Raspberry Pi, three-color, SPI interface
| More |
Interfaces
| VCC | 3.3V |
| GND | GND |
| DIN | SPI MOSI |
| CLK | SPI SCK |
| CS | SPI chip select (Low active) |
| DC | Data/Command control pin (High for data, and low for a command) |
| RST | External reset pin (Low for reset) |
| BUSY | Busy state output pin (Low for busy) |
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 suspending 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)
- Communication protocol
Note: Different from the traditional SPI protocol, the data line from the slave to the master is hidden since the device only has a display requirement.
- CS is slave chip select, when CS is low, the chip is enabled.
- DC is data/command control pin, when DC = 0, write command, when DC = 1, write data.
- SCLK is the SPI communication clock.
- SDIN is the data line from the master to the slave in SPI communication.
SPI communication has data transfer timing, which is combined by CPHA and CPOL.
- CPOL determines the level of the serial synchronous clock at an idle state. When CPOL = 0, the level is Low. However, CPOL has little effect on the transmission.
- CPHA determines whether data is collected at the first clock edge or at the second clock edge of the serial synchronous clock; when CPHL = 0, data is collected at the first clock edge.
- There are 4 SPI communication modes. SPI0 is commonly used, in which CPHL = 0, CPOL = 0.
As you can see from the figure above, data transmission starts at the first falling edge of SCLK, and 8 bits of data are transferred in one clock cycle. Here, SPI0 is in used, and data is transferred by bits, MSB first.
Resources
Documentation
Demo code
Datasheets
Related Resources
Notice:
The projects listed are all made and shared by the project owners, Waveshare isn't responsible for project either the update.
- This is a post in Arduino Form about our SPI e-Paper thanks to ZinggJM, maybe you want to refer to.
- This is the Inkycal project for reference.
FAQ
Answer:
- Two-color B/W e-paper
- 【Working】Temperature: 0~50°C; Humidity: 35%~65%RH
- 【Storage】Temperature: ≤30°C; Humidity: ≤55%RH; Max storage time: 6 months
- 【Transport】Temperature: -25~70°C; Max transport time: 10 days
- 【Unpack】Temperature: 20°C±5°C; Humidity: 50%RH±5%RH; Max storage time: Should be assembled in 72h
- Three-Color e-Paper
- 【Working】Temperature: 0~40°C; Humidity: 35%~65%RH
- 【Storage】Temperature: ≤30°C; Humidity: ≤55%RH; Max storage time: 3 months
- 【Transport】Temperature: -25~60°C; Max transport time: 10 days
- 【Unpack】Temperature: 20°C±5°C; Humidity: 50%RH±5%RH; Max storage time: Should be assembled in 72h
When store three-color e-Paper, please refresh it to white, and keep the screen upward. Note that you need to update it at least every three months.
Support
Technical Support
If you need technical support or have any feedback/review, please click the Submit Now button to submit a ticket, Our support team will check and reply to you within 1 to 2 working days. Please be patient as we make every effort to help you to resolve the issue.
Working Time: 9 AM - 6 AM GMT+8 (Monday to Friday)