The Adafruit E-Ink Bonnet for Raspberry Pi (Manufacturer Part ID: 6418) is a display add-on that leverages E-Ink technology to provide a low-power, high-contrast screen. This component is ideal for applications requiring static images or text, such as dashboards, e-readers, or low-power IoT displays. Its ability to retain an image without power makes it an excellent choice for energy-efficient projects.

• IoT dashboards and status displays
• E-readers and digital signage
• Low-power data visualization
• Home automation interfaces
• Static image or text displays for battery-powered devices

The Adafruit E-Ink Bonnet is designed to work seamlessly with Raspberry Pi boards, offering a plug-and-play experience. Below are the key technical details:

The E-Ink Bonnet connects to the Raspberry Pi via the GPIO header. Below is the pin configuration:

1. Attach the Bonnet: Align the E-Ink Bonnet with the GPIO header on your Raspberry Pi and press it down gently to ensure a secure connection.
2. Install Required Libraries:
   • Ensure your Raspberry Pi is running the latest version of Raspberry Pi OS.
   • Install the Adafruit Python libraries for E-Ink displays:

     sudo pip3 install adafruit-circuitpython-epd
     

3. Enable SPI Interface:
   • Open the Raspberry Pi configuration tool:

     sudo raspi-config
     

   • Navigate to Interfacing Options > SPI and enable it.
   • Reboot your Raspberry Pi to apply the changes.

Below is an example Python script to display text on the E-Ink Bonnet:

import time
import board
import digitalio
from adafruit_epd.epd import Adafruit_EPD
from adafruit_epd.ssd1680 import Adafruit_SSD1680

spi = board.SPI() cs_pin = digitalio.DigitalInOut(board.D8) # Chip Select dc_pin = digitalio.DigitalInOut(board.D25) # Data/Command rst_pin = digitalio.DigitalInOut(board.D24) # Reset busy_pin = digitalio.DigitalInOut(board.D23) # Busy

display = Adafruit_SSD1680( 250, 122, spi, cs_pin, dc_pin, rst_pin, busy_pin )

display.fill(Adafruit_EPD.WHITE) display.display()

display.text("Hello, E-Ink!", 10, 10, Adafruit_EPD.BLACK) display.display()

time.sleep(10)

• Avoid Frequent Updates: E-Ink displays are not designed for rapid refresh rates. Limit updates to once every few seconds to preserve the display's lifespan.
• Handle with Care: The E-Ink screen is fragile. Avoid applying pressure or bending the display.
• Power Management: Disconnect the Bonnet when not in use to conserve power.

1. Display Not Updating:

   • Ensure the SPI interface is enabled in the Raspberry Pi configuration.
   • Verify all connections between the Bonnet and Raspberry Pi are secure.
   • Check the power supply to ensure the Raspberry Pi is delivering sufficient voltage.

2. Partial or Corrupted Images:

   • Ensure the Python libraries are up to date:

     sudo pip3 install --upgrade adafruit-circuitpython-epd
     

   • Verify that the busy_pin is correctly connected and functioning.

3. Screen Remains Blank:

   • Confirm that the rst_pin is properly connected and the reset sequence is being executed in the code.
   • Check for any physical damage to the E-Ink screen.

Q: Can I use this Bonnet with other single-board computers?
A: The Bonnet is designed for Raspberry Pi, but it may work with other boards that support SPI communication. However, additional configuration may be required.

Q: How long does the display retain an image without power?
A: The E-Ink display can retain an image for months without power, making it ideal for low-power applications.

Q: Can I display images on the E-Ink Bonnet?
A: Yes, you can display monochrome or tri-color (black, white, red) images. Use the Adafruit Python libraries to load and display image files.

Q: What is the refresh time for the display?
A: The refresh time is approximately 2-3 seconds, depending on the content being updated.

By following this documentation, you can effectively integrate the Adafruit E-Ink Bonnet into your Raspberry Pi projects and take advantage of its low-power, high-contrast display capabilities.