Pico e-Paper 2.9 B EPD Module for Raspberry Pi Pico

Product Information

Specifications

• Product Name: Pico e-Paper 2.9 (B)
• Usage Environment: Indoor recommended
• E-Ink Screen Usage Environment:
  • Recommended Relative Humidity: 35%~65%RH
  • Maximum Storage Time: 6 months below 55%RH
  • Transportation Time: 10 days
• Screen Cable Interface Specification: 0.5mm pitch, 24Pin

Product Usage Instructions

Upload Demo At the First Time

1. Press and hold the BOOTSET button on the Pico board.

2. Connect the Pico to the USB port of the computer via the Micro
   USB cable.

3. Release the button when the computer recognizes a removable
   hard drive (RPI-RP2).

4. Download the demo and open arduinoPWMD1-LED path under the
   D1LED.ino.

5. Click Tools -> Port and remember the existing COM (different
   computers show different COM, remember the existing COM on your
   computer).

6. Connect the driver board to the computer with a USB cable.

7. Click Tools -> Ports and select uf2 Board for the first
   connection.

8. After the upload is complete, connecting again will result in
   an additional COM port.

9. Click Tool -> Dev Board -> Raspberry Pi Pico/RP2040 ->
   Raspberry Pi Pico.

10. After setting, click the right arrow to upload.

11. If you encounter problems, reinstall or replace the Arduino IDE
    version.

12. To uninstall the Arduino IDE, uninstall it cleanly.

13. Manually delete all the contents of the folder
    C:Users[name]AppDataLocalArduino15 (you need to show hidden
    files to see it).

14. Reinstall the Arduino IDE.

Open Source Demo

• MicroPython Demo (GitHub)
• MicroPython Firmware/Blink Demo (C)
• Official Raspberry Pi C/C++ Demo
• Official Raspberry Pi MicroPython Demo
• Arduino Official C/C++ Demo

FAQ

Question: What is the usage environment of the e-ink

screen?

Answer: The recommended relative humidity for the e-ink screen
is 35%~65%RH. For storage, it should be below 55%RH, and the
maximum storage time is 6 months. During transportation, it should
not exceed 10 days.

Question: What are the precautions for e-ink screen

refresh?

Answer: The e-ink screen is recommended for indoor use. If used
outdoors, it should be protected from direct sunlight and UV rays.
When designing products with e-ink screens, ensure that the
temperature and humidity requirements of the screen are met.

Question: Why can’t Chinese characters be displayed on the

e-ink screen?

Answer: The Chinese character library in our routine uses the
GB2312 encoding method. To display Chinese characters, please
change your xxx_test.c file to the GB2312 encoding format, compile
and download it.

Question: After using for a period of time, the screen refresh

(full refresh) has a serious afterimage problem that cannot be
repaired?

Answer: After each refresh operation, it is recommended to set
the screen to sleep mode or directly power off the device to
prevent the screen from being in a high voltage state for a long
time, which may cause burnout.

Question: Why does the e-Paper show a black border?

Answer: The border display color can be set through the Border
Waveform Control register or the VCOM AND DATA INTERVAL SETTING
register.

Question: What is the specification of the screen cable

interface?

Answer: The screen cable interface has a 0.5mm pitch and 24
pins.

Pico e-Paper 2.9 (B)

Overview

Pico e-Paper 2.9 (B)

2.9inch EPD (Electronic Paper Display) Module For Raspberry Pi Pico, 296 × 128 Pixels, Black / White / Red, SPI Interface.
Specification

Size: 2.9inch Outline dimensions(raw panel): 79.0mm × 36.7mm × 1.05mm Outline dimension(driver board): 82.0mm × 38.0mm Display size: 66.89mm × 29.05mm Operating voltage: 3.3V/5V Interface: SPI Dot pitch: 0.138 × 0.138 Resolution: 296 × 128 Display color: Black, White, Red Greyscale: 2 full refresh time: 15s Refresh power: 26.4mW (typ.) Standby current: <0.01uA (almost none) Note:

2.9inch EPD Module for Raspberry Pi Pico,
296 × 128, Black / White /Red, SPI

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.
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, the slave receives. Timing: CPHL=0, CPOL=0 (SPI0)
Remarks For specific information about SPI, you can search for information online. Working Protocol
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 displays patterns by reflecting the ambient light, so it has no background light requirement. (Note that the e-Paper cannot support updating directly under sunlight). How to define pixels In a monochrome picture we define the pixels, 0 is black and 1 is white.
White : Bit 1
BlackBit 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 the computer, the data is saved in MSB format:
So we can use two bytes for 16 pixels. For 2.13inch e-paper B, the display colors are red, black, and white. We need to split the picture into 2 pictures, one is a black and white picture, and another is a red and white picture. When transmitting, because one register controls a black or white pixel, one controls a Red or white display. The black and white part of 2.13 use 1 byte to control 8 pixels, and the red and white part uses 1 byte to control 8 pixels. For example, suppose there are 8 pixels, the first 4 are red, and the back 4 are black: They need to be disassembled into a black and white picture and a red and white picture. Both pictures have 8 pixels, but the first four pixels of the black and white picture are white, the last 4 pixels are black, and the first 4 pixels of the red and white picture One pixel is red, and the last four pixels are white.
If you define that the data of the white pixel is 1 and the black is 0, then we can get:
So that we can use 1 byte to control every eight pixels.

Precautions
1. 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!
2. 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.
3. 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!
4. 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)
5. After the screen enters sleep mode, the sent image data will be ignored, and it can be refreshed normally only after initializing again.
6. 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.
7. 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.
8. 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)
9. 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
10. The screen of e-Paper is relatively fragile, please try to avoid dropping, bumping, and pressing hard.
11. We recommend that customers use the sample program provided by us to test with the corresponding development board after they get the screen.
RPi Pico

Hardware Connection

Please take care of the direction when connecting Pico. A logo of the USB port is printed to indicate the directory, you can also check the pins. If you want to connect the board by an 8-pin cable, you can refer to the table below:

e-Paper Pico

Description

VCC VSYS

Power input

GND GND

Ground

DIN GP11 MOSI pin of SPI interface, data transmitted from Master to Slave.

CLK GP10

SCK pin of SPI interface, clock input

CS GP9

Chip select pin of SPI interface, Low Active

DC GP8

Data/Command control pin (High: Data; Low: Command)

RST GP12

Reset pin, low active

BUSY GP13

Busy output pin

KEY0 GP2

User key 0

KEY1 GP3

User key 1

RUN RUN

Reset

You can just attach the board to Pico like the Pico-ePaper-7.5.

Setup Environment
You can refer to the guides for Raspberry Pi: https://www.raspberrypi.org/documentation/pico/getting-started/ Download Demo codes
Open a terminal of Pi and run the following command:
cd ~ sudo wget https://files.waveshare.com/upload/2/27/Pico_ePaper_Code.zip unzip Pico_ePaper_Code.zip -d Pico_ePaper_Code cd ~/Pico_ePaper_Code
You can also clone the codes from Github.
cd ~ git clone https://github.com/waveshare/Pico_ePaper_Code.git cd ~/Pico_ePaper_Code
About the examples
The guides are based on Raspberry Pi. C codes
The example provided is compatible with several types, you need to modify the main.c file, uncomment the definition according to the actual type of display you get. For example, if you have the Pico-ePaper-2.13, please modify the main.c file, uncomment line 18 (or maybe it is line 19).
Set the project:
cd ~/Pico_ePaper_Code/c
Create build folder and add the SDK. ../../pico-sdk is the default path of the SDK, if you save the SDK to other directories, please change it to the actual path.
mkdir build cd build export PICO_SDK_PATH=../../pico-sdk
Run cmake command to generate Makefile file.
cmake ..
Run the command make to compile the codes.
make -j9
After compiling, the epd.uf2 file is generated. Next, press and hold the BOOTSEL button on the Pico board, connect the Pico to the Raspberry Pi using the Micro USB cable, and release the button. At this point, the device will recognize a removable disk (RPI-RP2). Copy the epd.uf2 file just generated to the newly recognized removable disk (RPI-RP2), Pico will automatically restart the running program. Python First press and hold the BOOTSEL button on the Pico board, use the Micro USB cable to connect the Pico to the Raspberry Pi, then release the button. At this point, the device will recognize a removable disk (RPI-RP2). Copy the rp2-pico-20210418-v1.15.uf2 file in the python directory to the removable disk (RPI-RP2) just identified. Update Thonny IDE.
sudo apt upgrade thonny
Open Thonny IDE (click on the Raspberry logo -> Programming -> Thonny Python IDE ), and select the interpreter:
Select Tools -> Options… -> Interpreter. Select MicroPython (Raspberry Pi Pico and ttyACM0 port). Open the Pico_ePaper-xxx.py file in Thonny IDE, then run the current script (click the green triangle).
C Code Analysis
Bottom Hardware Interface We package the hardware layer for easily porting to the different hardware platforms. DEV_Config.c(.h) in the directory: Pico_ePaper_CodeclibConfig.
Data type:

define UBYTE uint8_t #define UWORD uint16_t #define UDOUBLE uint32_t

Module initialize and exit:
void DEV_Module_Init(void); void DEV_Module_Exit(void); Note 1. The functions above are used to initialize the display or exit handle.
GPIO Write/Read:
void DEV_Digital_Write(UWORD Pin, UBYTE Value); UBYTE DEV_Digital_Read(UWORD Pin);
SPI transmits data:
void DEV_SPI_WriteByte(UBYTE Value);
EPD driver The driver codes of EPD are saved in the directory: Pico_ePaper_CodeclibePaper Open the .h header file, you can check all the functions defined.
Initialize e-Paper, this function is always used at the beginning and after waking up the display.
//2.13inch e-Paper, 2.13inch e-Paper V2, 2.13inch e-Paper (D), 2.9inch e-Paper, 2.9inch e-Paper (D) void EPD_xxx_Init(UBYTE Mode); // Mode = 0 fully update, Mode = 1 partial updat e //Other types void EPD_xxx_Init(void);
xxx should be changed by the type of e-Paper, For example, if you use 2.13inch e-Paper (D), to fully update, it should be EPD_2IN13D_Init(0) and EPD_2IN13D_Init(1) for the partial update;
Clear: this function is used to clear the display to white.
void EPD_xxx_Clear(void);
xxx should be changed by the type of e-Paper, For example, if you use 2.9inch ePaper (D), it should be EPD_2IN9D_Clear();
Send the image data (one frame) to EPD and display
//Bicolor version void EPD_xxx_Display(UBYTE Image); //Tricolor version void EPD_xxx_Display(const UBYTE blackimage, const UBYTE ryimage);
There are several types which are different from others
//Partial update for 2.13inch e-paper (D), 2.9inch e-paper (D) void EPD_2IN13D_DisplayPart(UBYTE Image); void EPD_2IN9D_DisplayPart(UBYTE Image);
//For 2.13inch e-paper V2, you need to first useEPD_xxx_DisplayPartBaseImage to display a static background and then partial update by the function EPD_xxx_Dis playPart() void EPD_2IN13_V2_DisplayPart(UBYTE Image); void EPD_2IN13_V2_DisplayPartBaseImage(UBYTE Image);
Enter sleep mode
void EPD_xxx_Sleep(void);
Note, You should only hardware reset or use initialize function to wake up ePaper from sleep mode xxx is the type of e-Paper, for example, if you use 2.13inch e-Paper D, it should be EPD_2IN13D_Sleep(). Application Programming Interface We provide basic GUI functions for testing, like draw point, line, string, and so on. The GUI function can be found in the directory: RaspberryPi_JetsonNanoclibGUIGUI_Paint.c(.h).
The fonts used can be found in the directory: RaspberryPi_JetsonNanoclibFonts.
Create a new image, you can set the image name, width, height, rotate angle, and color.
void Paint_NewImage(UBYTE image, UWORD Width, UWORD Height, UWORD Rotate, UWOR D Color) Parameters:
image: Name of the image buffer, this is a pointer; Width: Width of the image; Height: Height of the image; Rotate: Rotate the angle of the Image; Color: The initial color of the image;
Select image buffer: You can create multiple image buffers at the same time and select the certain one and draw by this function.
void Paint_SelectImage(UBYTE *image) Parameters:
image: The name of the image buffer, this is a pointer;
Rotate image: You need to set the rotation angle of the image, this function should be used after Paint_SelectImage(). The angle can be 0, 90, 180, or 270.
void Paint_SetRotate(UWORD Rotate) Parameters:
Rotate: Rotate the angle of the image, the parameter can be ROTATE_0, R OTATE_90, ROTATE_180, ROTATE_270.
Note After rotating, the place of the first pixel is different, we take a 1.54-inch
e-paper as an example.

Image mirror: This function is used to set the image mirror.
void Paint_SetMirroring(UBYTE mirror) Parameters:
mirror: Mirror type if the image, the parameter can be MIRROR_NONE, MIR ROR_HORIZONTAL, MIRROR_VERTICAL, MIRROR_ORIGIN.

Set the position and color of pixels: This is the basic function of GUI, it is used to set the position and color of a pixel in the buffer.
void Paint_SetPixel(UWORD Xpoint, UWORD Ypoint, UWORD Color) Parameters:
Xpoint: The X-axis value of the point in the image buffer Ypoint: The Y-axis value of the point in the image buffer Color: The color of the point

Clear display: To set the color of the image, this function always be used to clear the display.
void Paint_Clear(UWORD Color) Parameters:
Color: The color of the image

Color of the windows: This function is used to set the color of windows, it is always used for updating partial areas like displaying a clock.

void Paint_ClearWindows(UWORD Xstart, UWORD Ystart, UWORD Xend, UWORD Yend, UWO RD Color) Parameters:
Xpoint: The X-axis value of the start point in the image buffer Ypoint: The Y-axis value of the start point in the image buffer Xend: The X-axis value of the end point in the image buffer Yend: The Y-axis value of the end point in the image buffer Color: The color of the windows

Draw point: Draw a point at the position X point, Y point of the image
buffer, you can configure the color, size, and style.

void Paint_DrawPoint(UWORD Xpoint, UWORD Ypoint, UWORD Color, DOT_PIXEL Dot_Pix

el, DOT_STYLE Dot_Style)

Parameters:

Xpoint: X-axis value of the point.

Ypoint: Y-axis value of the point.

Color: Color of the point

Dot_Pixel: Size of the point, 8 sizes are available.

typedef enum {

DOT_PIXEL_1X1 = 1, // 1 x 1

DOT_PIXEL_2X2 ,

// 2 X 2

DOT_PIXEL_3X3 ,

// 3 X 3

DOT_PIXEL_4X4 ,

// 4 X 4

DOT_PIXEL_5X5 ,

// 5 X 5

DOT_PIXEL_6X6 ,

// 6 X 6

DOT_PIXEL_7X7 ,

// 7 X 7

DOT_PIXEL_8X8 ,

// 8 X 8

} DOT_PIXEL;

Dot_Style: Style of the point, define the extended mode of the point.

typedef enum {

DOT_FILL_AROUND = 1,

DOT_FILL_RIGHTUP,

} DOT_STYLE;

Draw the line: Draw a line from (Xstart, Ystart) to (Xend, Yend) in the image buffer, you can configure the color, width, and style.

void Paint_DrawLine(UWORD Xstart, UWORD Ystart, UWORD Xend, UWORD Yend, UWORD C

olor, LINE_STYLE Line_Style , LINE_STYLE Line_Style)

Parameters:

Xstart: Xstart of the line

Ystart: Ystart of the line

Xend: Xend of the line

Yend: Yend of the line

Color: Color of the line

Line_width: Width of the line, 8 sizes are available.

typedef enum {

DOT_PIXEL_1X1 = 1, // 1 x 1

DOT_PIXEL_2X2 ,

// 2 X 2

DOT_PIXEL_3X3 ,

// 3 X 3

DOT_PIXEL_4X4 ,

// 4 X 4

DOT_PIXEL_5X5 ,

// 5 X 5

DOT_PIXEL_6X6 ,

// 6 X 6

DOT_PIXEL_7X7 ,

// 7 X 7

DOT_PIXEL_8X8 ,

// 8 X 8

} DOT_PIXEL;

Line_Style: Style of the line, Solid or Dotted.

typedef enum {

LINE_STYLE_SOLID = 0,

LINE_STYLE_DOTTED,

} LINE_STYLE;

Draw a rectangle: Draw a rectangle from (Xstart, Ystart) to (Xend, Yend), you can configure the color, width, and style.

void Paint_DrawRectangle(UWORD Xstart, UWORD Ystart, UWORD Xend, UWORD Yend, UW

ORD Color, DOT_PIXEL Line_width, DRAW_FILL Draw_Fill)

Parameters:

Xstart: Xstart of the rectangle.

Ystart: Ystart of the rectangle.

Xend: Xend of the rectangle.

Yend: Yend of the rectangle.

Color: Color of the rectangle

Line_width: The width of the edges. 8 sizes are available.

typedef enum {

DOT_PIXEL_1X1 = 1, // 1 x 1

DOT_PIXEL_2X2 ,

// 2 X 2

DOT_PIXEL_3X3 ,

// 3 X 3

DOT_PIXEL_4X4 ,

// 4 X 4

DOT_PIXEL_5X5 ,

// 5 X 5

DOT_PIXEL_6X6 ,

// 6 X 6

DOT_PIXEL_7X7 ,

// 7 X 7

DOT_PIXEL_8X8 ,

// 8 X 8

} DOT_PIXEL;

Draw_Fill: Style of the rectangle, empty or filled.

typedef enum {

DRAW_FILL_EMPTY = 0,

DRAW_FILL_FULL,

} DRAW_FILL;

Draw circle: Draw a circle in the image buffer, use (X_Center Y_Center) as the center and Radius as the radius. You can configure the color, width of the line, and the style of the circle.

void Paint_DrawCircle(UWORD X_Center, UWORD Y_Center, UWORD Radius, UWORD Colo

r, DOT_PIXEL Line_width, DRAW_FILL Draw_Fill)

Parameters:

X_Center: X-axis of center

Y_Center: Y-axis of center

Radius: Radius of circle

Color: Color of the circle

Line_width: The width of arc, 8 sizes are available.

typedef enum {

DOT_PIXEL_1X1 = 1, // 1 x 1

DOT_PIXEL_2X2 ,

// 2 X 2

DOT_PIXEL_3X3 ,

// 3 X 3

DOT_PIXEL_4X4 ,

// 4 X 4

DOT_PIXEL_5X5 ,

// 5 X 5

DOT_PIXEL_6X6 ,

// 6 X 6

DOT_PIXEL_7X7 ,

// 7 X 7

DOT_PIXEL_8X8 ,

// 8 X 8

} DOT_PIXEL;

Draw_Fill: Style of the circle: empty or filled.

typedef enum {

DRAW_FILL_EMPTY = 0,

DRAW_FILL_FULL,

} DRAW_FILL;

Show Ascii character: Show a character in (Xstart, Ystart) position, you can
configure the font, foreground, and background.
void Paint_DrawChar(UWORD Xstart, UWORD Ystart, const char Ascii_Char, sFONT F ont, UWORD Color_Foreground, UWORD Color_Background) Parameters:
Xstart: Xstart of the character Ystart: Ystart of the character Ascii_Char: Ascii char Font: five fonts are avaialble
font8: 58 font12: 712 font16: 1116 font20: 1420 font24: 1724 Color_Foreground: foreground color Color_Background: background color

Draw the string: Draw the string at (Xstart Ystart), you can configure the
fonts, foreground, and the background
void Paint_DrawString_EN(UWORD Xstart, UWORD Ystart, const char pString, sFON T Font, UWORD Color_Foreground, UWORD Color_Background) Parameters:
Xstart: Xstart of the string Ystart: Ystart of the string pString: String Font: five fonts are available:
font8: 58 font12: 712 font16: 1116 font20: 1420 font24: 17*24 Color_Foreground: foreground color Color_Background: background color

Draw Chinese string: Draw the Chinese string at (Xstart Ystart) of the image
buffer. You can configure fonts (GB2312), foreground, and background.
void Paint_DrawString_CN(UWORD Xstart, UWORD Ystart, const char pString, cFON T font, UWORD Color_Foreground, UWORD Color_Background) Parameters:
Xstart: Xstart of string Ystart: Ystart of string pString: string Font: GB2312 fonts, two fonts are available
font12CN: ascii 1121Chinese 1621 font24CN: ascii 2441Chinese 3241 Color_Foreground: Foreground color Color_Background: Background color

Draw number: Draw numbers at (Xstart Ystart) of the image buffer. You can
select font, foreground, and background.
void Paint_DrawNum(UWORD Xpoint, UWORD Ypoint, int32_t Nummber, sFONT Font, UW ORD Color_Foreground, UWORD Color_Background) Parameters:
Xstart: Xstart of numbers Ystart: Ystart of numbers Nummber: numbers displayed. It supports int type and 2147483647 is the maximum supported Font: Ascii fonts, five fonts are available:
font8: 58 font12: 712 font16: 1116 font20: 1420 font24: 1724 Color_Foreground: foreground Color_Background: background

Display time: Display time at (Xstart Ystart) of the image buffer, you can
configure fonts, foreground, and background.
This function is used for partial updating. Note that some of the e-Paper don’t
support partial updates and you cannot use partial updates all the time, which
will have ghosts problems and destroy the display.
void Paint_DrawTime(UWORD Xstart, UWORD Ystart, PAINT_TIME pTime, sFONT Font, UWORD Color_Background, UWORD Color_Foreground) Parameters:
Xstart: Xstart of time Ystart: Ystart of time pTime: Structure of time Font: Ascii font, five fonts are available
font8: 58 font12: 712 font16: 1116 font20: 1420 font24: 17*24 Color_Foreground: foreground Color_Background: background

Resource

Document Schematic 2.9inch e-Paper (B) Specification

Demo codes

Demo codes Github link

Development Software

Thonny Python IDE (Windows V3.3.3) Zimo221.7z Image2Lcd.7z

Pico Quick Start Download Firmware

MicroPython Firmware Download C_Blink Firmware Download Video Tutorial

[Expand] [Expand]

Pico Tutorial I – Basic Introduction
Pico Tutorial II – GPIO
Pico Tutorial III – PWM
Pico Tutorial IV – ADC
Pico Tutorial V – UART
Pico Tutorial VI – To be continued…
MicroPython Series
MicroPython machine.Pin Function MicroPython machine.PWM Function MicroPython machine.ADC Function MicroPython machine.UART Function MicroPython machine.I2C Function MicroPython machine.SPI Function MicroPython rp2.StateMachine

[Expand] [Expand] [Expand] [Expand] [Expand]

C/C++ Series
C/C++ Windows Tutorial 1 – Environment Setting C/C++ Windows Tutorial 1 – Create New Project

Arduino IDE Series Install Arduino IDE 1. Download the Arduino IDE installation package from Arduino website .

2. Just click on “JUST DOWNLOAD”.

3. Click to install after downloading.
4. Note: You will be prompted to install the driver during the installation process, we can click Install.
Install Arduino-Pico Core on Arduino IDE 1. Open Arduino IDE, click the File on the left corner and choose “Preferences”.
2. Add the following link in the additional development board manager URL, then click OK. https://github.com/earlephilhower/arduino- pico/releases/download/globa l/package_rp2040_index.json
Note: If you already have the ESP8266 board URL, you can separate the URLs with commas like this:
https://dl.espressif.com/dl/package_esp32_index.json,https://github.co m/earlephilhower/arduino-pico/releases/download/global/packagerp2040 index.json 3. Click on Tools -> Dev Board -> Dev Board Manager -> Search for pico, it shows installed since my computer has already installed it.

Upload Demo At the First Time
1. Press and hold the BOOTSET button on the Pico board, connect the Pico to the USB port of the computer via the Micro USB cable, and release the button when the computer recognizes a removable hard drive (RPI-RP2).

2. Download the demo, open arduinoPWMD1-LED path under the D1LED.ino.
3. Click Tools -> Port, remember the existing COM, do not need to click this COM (different computers show different COM, remember the existing COM on your computer).

4. Connect the driver board to the computer with a USB cable, then click Tools -> Ports, select uf2 Board for the first connection, and after the upload is complete, connecting again will result in an additional COM port.

5. Click Tool -> Dev Board -> Raspberry Pi Pico/RP2040 -> Raspberry Pi Pico.

6. After setting, click the right arrow to upload.
If you encounter problems during the period, you need to reinstall or replace the Arduino IDE version, uninstall the Arduino IDE needs to be uninstalled cleanly, after uninstalling the software you need to manually delete all the contents of the folder C:Users [name]AppDataLocalArduino15 (you need to show the hidden files in order to see it) and then reinstall. Pico-W Series Tutorial (To be continued…)
Open Source Demo
MicroPython Demo (GitHub) MicroPython Firmware/Blink Demo (C) Official Raspberry Pi C/C++ Demo Official Raspberry Pi MicroPython Demo Arduino Official C/C++ Demo
FAQ
Question:What is the usage environment of the e-ink screen? Answer:
Operating conditions Temperature range: 0~50°C; Humidity range:
35%~65%RH.
Storage conditions Temperature range: below 30°C; Humidity range:
below 55%RH; Maximum storage time: 6 months.
Transport conditions Temperature range: -25~70°C; Maximum
transportation time: 10 days.
After unpacking Temperature range: 20°C±5°C; Humidity range:
50±5%RH; Maximum storage time: Assemble within 72 hours.
Question:Precautions for e-ink screen refresh? Answer:
Refresh mode Full refresh: The electronic ink screen will flicker several times during the refresh process (the number of flickers depends on the refresh time), and the flicker is to remove the afterimage to achieve the best display effect. Partial refresh: The electronic ink screen has no flickering effect during the refresh process. Users who use the partial brushing function note that after refreshing several times, a full brush operation should be performed to remove the residual image, otherwise the residual image problem will become more and more serious, or even damage the screen (currently only some black and white e-ink screens support partial brushing, please refer to product page description).
Refresh rate During use, it is recommended that customers set the refresh interval of the e-ink screen to at least 180 seconds (except for products that support the local brush function) During the standby process (that is, after the refresh operation), it is recommended that the customer set the e-ink screen to sleep mode, or power off operation (the power supply part of the ink screen can be disconnected with an analog switch) to reduce power consumption and prolong the life of the e-ink screen. (If some e-ink screens are powered on for a long time, the screen will be damaged beyond repair.) During the use of the three-color e-ink screen, it is recommended that customers update the display screen at least once every 24 hours (if the screen remains the same screen for a long time, the screen burn will be difficult to repair).
Usage scenarios The e-ink screen is recommended for indoor use. If you use it outdoors, you need to avoid direct sunlight on the e-ink screen and take UV protection measures at the same time. When designing eink screen products, customers should pay attention to determining whether the use environment meets the temperature and humidity requirements of the e-ink screen.
Question:Chinese cannot be displayed on the e-ink screen? Answer: The Chinese character library of our routine uses the GB2312 encoding method, please change your xxx_test.c file to GB2312 encoding format, compile and download it, and then it can be displayed normally.
Question:After using for a period of time, the screen refresh (full refresh) has a serious afterimage problem that cannot be repaired? Answer: Power on the development board for a long time, after each refresh operation, it is recommended to set the screen to sleep mode or directly power off processing, otherwise, the screen may burn out when the screen is in a high voltage state for a long time.
Question: e-Paper shows black border? Answer: The border display color can be set through the Border Waveform Control register or the VCOM AND DATA INTERVAL SETTING register.
Question: What is the specification of the screen cable interface? Answer: 0.5mm pitch, 24Pin.
In this case, the customer needs to reduce the position of the round brush and clear the screen after 5 rounds of brushing (increasing the voltage of VCOM can improve the color, but it will increase the afterimage).
Question: After the ink screen enters deep sleep mode, can it be refreshed again? Answer: Yes, but you need to re-initialize the electronic paper with software.
Question:When the 2.9-inch EPD is in deep sleep mode, the first time it wakes up, the screen refresh will be unclean. How can I solve it? Answer: The process of re-awakening the e-ink screen is actually the process of repowering on, so when the EPD wakes up, the screen must be cleared first, so as to avoid the afterimage phenomenon to the greatest extent.
Question: Are bare screen products shipped with a surface coating? Answer: with film.
Question: Does e-Paper have a built-in temperature sensor? Answer: Yes, you can also use the IIC pin external LM75 temperature sensor.
Question:When testing the program, the program keeps stuck on an e-Paper busy? Answer: It may be caused by the unsuccessful spi driver 1. Check whether the wiring is correct 2. Check whether the spi is turned on and whether the parameters are configured correctly (spi baud rate, spi mode, and other parameters).
Question: What is the refresh rate/lifetime of this e-ink screen? Answer: Ideally, with normal use, it can be refreshed 1,000,000 times (1 million times).
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References

• GitHub - waveshareteam/Pico_ePaper_Code: Waveshrae Pico e-Paper driver code

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