The WaveShare 2.13inch E-Ink Display (Pico-ePaper-2.13) is a low-power display module that utilizes E-Ink technology to deliver crisp and sharp visual output. This display is specifically designed for the Raspberry Pi Pico, making it an excellent choice for projects requiring static images or text. Its 2.13-inch screen size and energy-efficient design make it ideal for applications such as IoT dashboards, e-readers, and low-power information displays.

• IoT devices and dashboards
• Digital price tags
• E-readers and portable displays
• Low-power signage
• Embedded systems requiring static or semi-static content

Below are the key technical details of the WaveShare 2.13inch E-Ink Display:

The module connects to the Raspberry Pi Pico via GPIO pins. Below is the pin configuration:

1. Wiring: Connect the display module to the Raspberry Pi Pico as per the pin configuration table:
   • Use jumper wires or a breadboard for prototyping.
   • Ensure the VCC and GND pins are correctly connected to the Pico's 3.3V and GND pins.
2. Install Required Libraries:
   • Download and install the WaveShare E-Ink library for MicroPython from the official WaveShare GitHub repository.
   • Copy the library files to the Raspberry Pi Pico using a tool like Thonny IDE.
3. Write and Upload Code:
   • Use the example code provided below to initialize and display content on the screen.

The following MicroPython code demonstrates how to display text and an image on the WaveShare 2.13inch E-Ink Display:

from machine import Pin, SPI import framebuf import epd2in13 # Import the WaveShare E-Ink library

spi = SPI(1, baudrate=2000000, polarity=0, phase=0) # SPI configuration cs = Pin(5, Pin.OUT) # Chip select pin dc = Pin(4, Pin.OUT) # Data/Command pin rst = Pin(3, Pin.OUT) # Reset pin busy = Pin(2, Pin.IN) # Busy pin

epd = epd2in13.EPD(spi, cs, dc, rst, busy) epd.init() # Initialize the display

epd.clear()

buffer = bytearray(epd.width * epd.height // 8) fb = framebuf.FrameBuffer(buffer, epd.width, epd.height, framebuf.MONO_HLSB)

fb.fill(0) # Clear the frame buffer fb.text('Hello, E-Ink!', 10, 10, 1) # Display text at (10, 10)

epd.display_frame(buffer)

epd.sleep()

• Power Supply: Ensure the Raspberry Pi Pico is powered via USB or a stable 3.3V source.
• Refresh Rate: The display has a refresh time of approximately 2 seconds. Avoid frequent updates to preserve the display's lifespan.
• Static Content: E-Ink displays are best suited for static or semi-static content due to their slow refresh rate.
• Library Compatibility: Use the official WaveShare library for optimal performance and compatibility.

1. Display Not Turning On:

   • Verify the wiring connections, especially the VCC and GND pins.
   • Ensure the Raspberry Pi Pico is powered and running the correct code.

2. No Output on the Screen:

   • Check the SPI connections (DIN, CLK, CS, DC).
   • Ensure the epd2in13 library is correctly installed and imported.

3. Busy Pin Stuck High:

   • The display may be in the middle of an update. Wait for the BUSY pin to go low before sending new commands.

4. Text or Image Not Displaying Properly:

   • Ensure the frame buffer is correctly initialized and updated.
   • Verify the resolution of the image matches the display's resolution (250 × 122 pixels).

Q: Can I use this display with other microcontrollers?
A: Yes, the display can be used with other microcontrollers that support SPI communication, but you may need to adapt the library or write your own driver.

Q: How do I display images?
A: Convert the image to a monochrome bitmap (250 × 122 pixels) and load it into the frame buffer. Use the epd.display_frame() function to display it.

Q: Is the display sunlight-readable?
A: Yes, E-Ink displays are highly readable in direct sunlight, making them ideal for outdoor applications.

Q: How do I reduce power consumption?
A: Put the display into sleep mode using the epd.sleep() function when not in use.