Waveshare
3inch E-Paper Module (G), 400 × 168, Red/Yellow/Black/White
A 3-inch four-colour e-paper display module from Waveshare, capable of displaying red, yellow, black, and white. With ultra-low power consumption and a wide ...
A 3-inch four-colour e-paper display module from Waveshare, capable of displaying red, yellow, black, and white. With ultra-low power consumption and a wide viewing angle of over 170°, the display retains its content even when powered off — ideal for price tags, shelf labels, and battery-powered signage.
The module connects via SPI and includes an onboard voltage translator for compatibility with both 3.3V and 5V microcontrollers. Development resources and examples are provided for Raspberry Pi, Arduino, and STM32.
Specifications
- Resolution – 400 × 168 pixels
- Display Colours – Red, yellow, black, white
- Grey Scale – 2
- Display Size – 70.4 × 29.568 mm
- Outline Dimensions – 88.5 × 41 mm
- Dot Pitch – 0.176 × 0.176 mm
- Operating Voltage – 3.3V / 5V
- Interface – 3-wire SPI or 4-wire SPI
- Full Refresh Time – 12 seconds
- Refresh Power – <60 mW (typical)
- Standby Current – <0.01 µA (virtually zero)
- Viewing Angle – >170°
Pin Definitions
- VCC – Power input (3.3V / 5V)
- GND – Ground
- DIN – SPI MOSI
- CLK – SPI SCK
- CS – SPI chip select (active low)
- DC – Data/command select (high = data, low = command)
- RST – Reset (active low)
- BUSY – Busy status output
Key Features
- Four-Colour Display – Red, yellow, black, and white for eye-catching content
- Ultra-Low Power – Only draws power during refresh; retains display content when powered off
- Onboard Voltage Translator – Compatible with 3.3V and 5V logic levels
- Wide Viewing Angle – Over 170° for easy readability from any direction
- No Backlight – Passively reflective, paper-like display
Ideal For
- Electronic shelf labels and price tags
- Battery-powered status displays and signage
- Industrial instruments and dashboards
Package Contents
- 1× 3-inch E-Paper Module (G)
Jargon buster
Plain-language definitions for the technical terms used above.
- 3.3V and 5V logic levels
- Logic level refers to the voltage a board uses to represent digital on and off signals. Support for both 3.3V and 5V logic means this breakout can connect more easily to common microcontrollers and single-board computers without extra level-shifting hardware.
- active LOW
- Active LOW means an input is considered switched on when it is connected to a low voltage or ground. This matters when wiring buttons, switches, or other trigger signals so the board responds in the expected way.
- CLK
- CLK is the clock signal that times when SPI data bits are sent and read. A display needs this pin connected correctly so the controller and screen stay in step while data is transferred.
- CS
- CS stands for chip select, a control pin used by SPI devices to tell which connected device should listen. It matters when you connect more than one SPI module to the same microcontroller, because each device usually needs its own CS pin.
- DIN
- DIN means data in, the pin where this display receives data from the controller. Connecting DIN to the correct SPI data output pin is needed for the screen to receive pixel and command information.
- RST
- Short for reset, a control pin used to restart or initialise a device from a microcontroller. It matters because this sensor requires the RST pin to be connected for some communication setups.
- SPI
- A fast serial communication bus often used for displays, memory cards, and sensors. It matters because SPI devices need specific pins for clock and data, plus a separate chip-select line for each device.
- STM32
- STM32 is a family of microcontroller chips commonly used in embedded electronics. Knowing a product uses an STM32 can help when looking at firmware updates, pin connections, or low-level serial control options.
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Displays & Screens
Related Tutorials
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