Documentation

• 7.5inch e-Paper V2 Specification (current version)
• 7.5inch-e-paper V1 Specification
• Schematic

Demo code

• Demo (E-Paper_code.7z)
• Demo (E-Paper_code.zip)
• Github

Development Resources

• E-Paper Floyd-Steinberg
• Image2Lcd.7z
• Image2Lcd Image Modulo
• Zimo221.7z
• E-Paper_API_Analysis

Version Description

• V2: The resolution is 800 × 480. The hardware structure and interface of the V2 version are compatible with the V1 version and adopt the V2 program. If you are purchasing for the first time, and there is a V2 label on the back of the screen, you can directly use the V2 program.
• V1: The resolution is 640 × 384, using the V1 program. (More information can be found in the datasheet.)

Parameter

• 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

• CSB (CS): Slave chip select, when CS is low, the chip is enabled.
• SCL (SCK/SCLK): UART clock signal.
• D/C (DC): Data/command control pin, writes commands at a low level; writes data/parameter at a high level.
• SDA (DIN): Serial data signal.
• Timing: CPHL=0, CPOL=0 (SPI0)

【Remarks】For more information about SPI, you can search for information online.

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.

We define the pixels in a monochrome picture, 0 is black and 1 is white.
White：□: Bit 1
Black：■: Bit 0

• 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
  
• 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:
  

For computer, the data is saved in MSB format:

So we can use two bytes for 16 pixels.

• 7.5inch e-Paper V2

The display principle is exactly the same as above.

• 7.5inch e-paper (V1)

Because of the problem of the controller, it defines 0000b to indicate that the corresponding pixel is black, and 0011b to indicate that the corresponding pixel is white, which is 4bit = 1pixel, and the lower two bits of the 4bit are both 0 to display black. On the contrary, the lowest two bits of 4bit can be 1 at the same time. Display white, other data will cause the color of the pixel to be uncertain;
For example:
0x00: 2 pixels ■■
0x03: 2 pixels ■□
0x30: 2 pixels □■
0x33: 2 pixels □□
Taking 4 pixels as an example, we assume that the first 2 pixels are black and the last 2 pixels are white, then the logic of people is like this, which is stored in sequence:

For a computer, its data storage method is high-order first, low-order last, and a byte has only 8 bits, so it is stored in a byte like this:

Precautions

1. For E-paper displays that support partial refresh, please note that you cannot refresh them with the partial refresh mode all the time. After refreshing partially several times, you need to fully refresh EPD once. Otherwise, the display effect will be abnormal, which cannot be repaired!
   
2. 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 it. Otherwise, the screen will remain in a high voltage state for a long time, which will damage the e-Paper and cannot be repaired!
   
3. When using the e-Paper display, it is recommended that the refresh interval is at least 180s, and refresh at least once every 24 hours. If the e-Paper is not used for a long time, you should use the program to clear the screen before storing it. (Refer to the datasheet for specific storage environment requirements.)
   
4. After the screen enters sleep mode, the sent image data will be ignored, and it can be refreshed normally only after initializing again.
   
5. Control the 0x3C or 0x50 (refer to the datasheet for details) register to adjust the border color. In the demo, you can adjust the Border Waveform Control register or VCOM AND DATA INTERVAL SETTING to set the border.
   
6. 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.
   
7. The working voltage of the e-Paper display 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. The old version only supports 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.)
   
8. The FPC cable of the screen is fragile, Please note: Do not bend the cable along the vertical direction of the screen to avoid tearing the cable; Do not repeatedly excessive bending line, to avoid line fracture; Do not bend the cable toward the front of the screen to prevent the cable from being disconnected from the panel. It is recommended to use fixed wiring during debugging and development.
   
9. The screen of e-Paper is relatively fragile, please try to avoid dropping, bumping, and pressing hard.
   
10. We recommend that customers use the sample program provided by us to test with the corresponding development board.
    

Working With Raspberry Pi

Hardware Connection

When connecting the Raspberry Pi, you can directly insert the board into the 40PIN pin header of the Raspberry Pi, and pay attention to the correct pins.
If you choose to connect with an 8PIN cable, please refer to the pin correspondence table below:

Enable SPI Interface

• Open the Raspberry Pi terminal and enter the following command in the config interface:

sudo raspi-config
Choose Interfacing Options -> SPI -> Yes Enable SPI interface

Then reboot your Raspberry Pi:

sudo reboot

• Check /boot/config.txt, and you can see 'dtparam=spi=on' was written in.

• To make sure SPI is not occupied, it is recommended to close other drivers' coverage. You can use ls /dev/spi* to check whether SPI is occupied. If the terminal outputs /dev/spidev0.1 and /dev/spidev0.1, SPI is not occupied.

C

• Install BCM2835

#Open the Raspberry Pi terminal and run the following command
wget http://www.airspayce.com/mikem/bcm2835/bcm2835-1.71.tar.gz
tar zxvf bcm2835-1.71.tar.gz
cd bcm2835-1.71/
sudo ./configure && sudo make && sudo make check && sudo make install
# For more information, please refer to the official website: http://www.airspayce.com/mikem/bcm2835/

• Install WiringPi (Optional)

#Open the Raspberry Pi terminal and run the following command:
sudo apt-get install wiringpi
#For Raspberry Pi systems after May 2019 (earlier than before, you may not need to execute), you may need to upgrade:
wget https://project-downloads.drogon.net/wiringpi-latest.deb
sudo dpkg -i wiringpi-latest.deb
gpio -v
#Run gpio -v and version 2.52 will appear. If it does not appear, the installation is wrong.

#Bullseye branch system use the following command:
git clone https://github.com/WiringPi/WiringPi
cd WiringPi
./build
gpio -v
# Run gpio -v and version 2.60 will appear. If it does not appear, it means that there is an installation error.

• Download the demo via GitHub (You can skip this step if you have downloaded it.)

git clone https://github.com/waveshare/e-Paper.git
cd e-Paper/RaspberryPi_JetsonNano/

• Download the demo (You can skip this step if you have downloaded it.)

sudo apt-get install p7zip-full
wget  https://files.waveshare.com/upload/3/39/E-Paper_code.7z
7z x E-Paper_code.7z -O./e-Paper
cd e-Paper/RaspberryPi_JetsonNano/

• Compile the demo (Note: -j4 is to compile with 4 threads, the numbers can be modified by yourself; EPD=epd7in5V2 is to specify a macro definition, and epd7in5v2 corresponds to the test demo in the main function).

# Now at e-Paper/RaspberryPi_JetsonNano
cd c
sudo make clean
sudo make -j4 EPD=epd7in5V2

• Run the demo

sudo ./epd

Python

• Install the function library

sudo apt-get update
sudo apt-get install python3-pip
sudo apt-get install python3-pil
sudo apt-get install python3-numpy
sudo pip3 install RPi.GPIO
sudo pip3 install spidev

• Install function library (python2)

sudo apt-get update
sudo apt-get install python-pip
sudo apt-get install python-pil
sudo apt-get install python-numpy
sudo pip install RPi.GPIO
sudo pip install spidev

• Download the demo via GitHub (You can skip this step if you have downloaded it.)

git clone https://github.com/waveshare/e-Paper.git
cd e-Paper/RaspberryPi_JetsonNano/

• Download the demo (You can skip this step if you have downloaded it.)

sudo apt-get install p7zip-full
wget  https://files.waveshare.com/upload/3/39/E-Paper_code.7z
7z x E-Paper_code.7z -O./e-Paper
cd e-Paper/RaspberryPi_JetsonNano/

• Run the demo

# Make sure it's in e-Paper/RaspberryPi_JetsonNano/
cd python/examples/
python3 epd_7in5_V2_test.py

Working With Arduino

Hardware Connection

Use an 8PIN cable to connect, please refer to the pin correspondence table below:

Install IDE

Arduino IDE Windows Install Guide

Run The Demo

• Download the demo in Resource, unzip it to the "E-Paper_code" directory, and you can see the following content:

• Open the test demo: E-Paper_code\Arduino\epd7in5_V2\epd7in5_V2.ino

• Select the corresponding Board and Port in the Tools in the Arduino IDE.

• Finally, click upload, the upload is successful as follows (Arduino 1.8.13).

Working With Jetson Nano

Hardware Connection

The 40PIN pin of Jetson Nano is compatible with the 40PIN pin of Raspberry Pi and provides a Jetson.GPIO library with the same API as the RPI.GPIO library of Raspberry Pi, so the serial number connected here is the same as that of Raspberry Pi. The module can be directly inserted into the 40Pin headers of the Jetson Nano when using the 40PIN interface.
If you choose to connect with an 8PIN cable, please refer to the pin correspondence table below:

C

• Download the demo via GitHub (you can skip this step if you have downloaded it.)

git clone https://github.com/waveshare/e-Paper.git
cd e-Paper/RaspberryPi_JetsonNano/

• Download the test demo: (you can skip this step if you have downloaded it.)

sudo apt-get install p7zip-full
wget  https://files.waveshare.com/upload/3/39/E-Paper_code.7z
7z x E-Paper_code.7z -O./e-Paper
cd e-Paper/RaspberryPi_JetsonNano/

• Compile the demo (Note: JETSON is the specified device, and RPI is not specified by default. -j4 is to compile by 4 threads, and the number can be changed by yourself. "EPD=epd7in5V2" is to specify a macro definition, and "epd7in5V2" corresponds to the test demo in the main function.)

# Now at e-Paper/RaspberryPi_JetsonNano
cd c
sudo make clean
sudo make JETSON -j4 EPD=epd7in5V2

• Run the demo

sudo ./epd

Python

• Install function library

sudo apt-get update
sudo apt-get install python3-numpy
sudo apt-get install python3-pip
sudo pip3 install Jetson.GPIO

• Download the demo via GitHub (you can skip this step if you have downloaded it.)

git clone https://github.com/waveshare/e-Paper.git
cd e-Paper/RaspberryPi_JetsonNano/

• Download the demo (you can skip this step if you have downloaded it.)

sudo apt-get install p7zip-full
wget  https://files.waveshare.com/upload/3/39/E-Paper_code.7z
7z x E-Paper_code.7z -O./e-Paper
cd e-Paper/RaspberryPi_JetsonNano/

• Run the demo

# Make sure it's in e-Paper/RaspberryPi_JetsonNano/
cd python/examples/
python3 epd_7in5_V2_test.py

Working With Sunrise X3 Pi

Hardware Connection

When connecting the Sunrise X3 Pi, you can directly insert the board into the 40PIN pin header of the Sunrise X3 Pi, and pay attention to the correct pins.
If you choose to connect with an 8PIN cable, please refer to the pin correspondence table below:

Enable SPI

• SPI is enabled by default. If you have disabled it, you can enable it by following the steps below.
• Enter the command: sudo srpi-config

Python

• The corresponding library has been installed in the function. If you uninstall it accidentally, please use the following command to install it.

sudo apt-get update
sudo apt-get install python-pip
sudo apt-get install python-pil
sudo apt-get install python-numpy
sudo pip install Hobot.GPIO
sudo pip install spidev

• Download the demo via GitHub (skip this step if you have downloaded it).

git clone https://github.com/waveshare/e-Paper.git
cd e-Paper/RaspberryPi_JetsonNano/

• Download the demo (skip this step if you have downloaded it).

sudo apt-get install p7zip-full
wget  https://files.waveshare.com/upload/3/39/E-Paper_code.7z
7z x E-Paper_code.7z -O./e-Paper
cd e-Paper/RaspberryPi_JetsonNano/

• Run the demo

# Make sure you are in e-Paper/RaspberryPi_JetsonNano/
cd python/examples/
python3 epd_7in5_V2_test.py

Working With STM32

Hardware Connection

Run The Program

• Click to download the demo, and then unzip it into the E-Paper_code directory to see the following content.

• Use Keil to open epd-demo.uvprojx in the E-Paper_code\STM32\STM32-F103ZET6\MDK-ARM directory
• Open Keil's compilation toolbar (usually already open).

• Select the EPD_7in5_V2_test at the location shown in the picture.

• Click to compile.

• Make sure the appropriate programmer is connected, then click LOAD to download the demo to the microcontroller.

ESP32/8266

ESP32

There is a lot of content, please click the URL below to view: https://www.waveshare.com/wiki/E-Paper_ESP32_Driver_Board

ESP8266

There is a lot of content, please click the URL below to view: https://www.waveshare.com/wiki/E-Paper_ESP8266_Driver_Board

Documentation

• 7.5inch e-Paper V2 Specification (current version)
• 7.5inch-e-paper V1 Specification
• Schematic

Demo code

• Demo (E-Paper_code.7z)
• Demo (E-Paper_code.zip)
• Github

Development Resources

• E-Paper Floyd-Steinberg
• Image2Lcd.7z
• Image2Lcd Image Modulo
• Zimo221.7z
• E-Paper_API_Analysis

Question about Screen

To：

Dear Customers, There may be a lag of several hours before we could process your order, depending on the time difference between your location and ours. Sincerely hoping your understanding!

Email(support)

services01@spotpear.com