Design with Adafruit 2.9in eInk Under FeatherWing in Cirkit DesignerThe Adafruit 2.9in eInk Under FeatherWing is an electronic paper display module that offers the benefits of low power consumption and high visibility even in bright sunlight. This 2.9-inch display is perfect for applications where a traditional LCD or OLED would consume too much power or be difficult to read. It is particularly well-suited for battery-powered devices, wearable technology, and outdoor applications where readability in sunlight is essential.
Common applications include:
This circuit interfaces an Arduino UNO with a 2.9" Greyscale eInk display, allowing the microcontroller to control the display and render images. The Arduino is programmed to initialize the display, draw a checkerboard pattern, and invert the pattern after a delay, demonstrating the eInk display's ability to hold images without continuous updates.
Open Project in Cirkit Designer
This circuit consists of an Arduino UNO connected to an Adafruit OLED FeatherWing display via I2C communication (SDA and SCL lines). The Arduino is powered through a Vcc source and provides 3.3V and GND connections to the OLED display. The Arduino runs a program to display 'Hello, World!' on the OLED screen.
Open Project in Cirkit Designer
This circuit features an Adafruit HUZZAH32 ESP32 Feather board as the central microcontroller, which is connected to an Adafruit Quad AlphaNumeric Featherwing display and an Adafruit ADXL343 accelerometer via I2C communication (SCL and SDA lines). The ESP32 controls a vibration motor connected to one of its GPIO pins (A5_IO4) and shares a common power supply (3.3V) and ground (GND) with the other components. The purpose of this circuit is likely to read acceleration data, display information on the alphanumeric display, and provide haptic feedback through the vibration motor.
Open Project in Cirkit Designer
This circuit integrates an Adafruit MPR121 capacitive touch sensor with an Adafruit Feather 32u4 Bluefruit microcontroller. The MPR121 is powered by the Feather and communicates via I2C (SCL and SDA) to detect touch inputs, which can be processed or transmitted wirelessly by the Feather.
Open Project in Cirkit Designer| Pin Number | Name | Description |
|---|---|---|
| 1 | GND | Ground connection |
| 2 | 3V | 3.3V power supply |
| 3 | RST | Reset pin for the display |
| 4 | BUSY | Busy state output from the display |
| 5 | CS | Chip Select for SPI communication |
| 6 | SCK | Serial Clock for SPI communication |
| 7 | MOSI | Master Out Slave In for SPI communication |
| 8 | MISO | Master In Slave Out for SPI communication (not used) |
| 9 | D/C | Data/Command control pin |
To use the Adafruit 2.9in eInk Under FeatherWing with an Adafruit Feather board:
#include <Adafruit_EPD.h>
#include <Adafruit_GFX.h>
// Pin definitions (may vary depending on your specific setup)
#define EPD_CS 10
#define EPD_DC 9
#define EPD_RESET 8
#define EPD_BUSY 7
// Create an instance of the display
Adafruit_IL0373 display(296, 128, EPD_DC, EPD_RESET, EPD_CS, EPD_BUSY);
void setup() {
// Initialize the display
display.begin();
// Clear the buffer
display.clearBuffer();
// Draw some text on the screen
display.setCursor(10, 10);
display.setTextSize(1);
display.print("Hello, eInk!");
// Display the buffer on the screen
display.display();
}
void loop() {
// Nothing to do here
}
Ensure that you have installed the Adafruit_EPD library in the Arduino IDE before uploading this code to your board.
Adafruit_EPD library is installed and updated to the latest version in the Arduino IDE.Q: Can the display show images in color? A: No, this eInk display is monochrome, capable of displaying black, white, and red shades only.
Q: How long does the image last on the display after power is removed? A: eInk displays are bistable, meaning the image can remain on the screen indefinitely without power.
Q: Is the display readable in the dark? A: No, unlike an LCD or OLED, eInk displays do not emit light and require external lighting to be readable in the dark.
Q: Can I use this display with other microcontrollers besides Adafruit Feather boards? A: Yes, as long as the microcontroller supports SPI communication and operates at 3.3V logic levels, it can be used with this display. However, you may need to adjust the pin definitions in your code accordingly.