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Green rectangular circuit board with 24-pin connector and surface-mounted chips

Adafruit

Adafruit eInk Breakout Friend 32KB SRAM engineering development tool

SKU CH-JEEB-GSGSJ

Breakout board with 32KB SRAM drives tri-color eInk displays up to 4.2 inches at 300x400 resolution

  • TypePrototyping Products
  • Controls tri-color 4.2" 300x400 displays
  • 32KB SRAM buffers full 30KB frames
  • Shares display SPI port for simpler wiring
  • Includes power supply and level-shifting circuitry
  • 24-pin connector fits standard eInk panels

Adafruit eInk Breakout Friend 32KB SRAM

This development tool provides the power supply support circuitry and level shifting required to connect a standard 24-pin eInk display up to 4.2 inches. It includes 32KB of SRAM so you can prepare frame buffers before transferring data to the display. The board shares the SPI port used by the display, requiring only one additional connection. It is intended for engineers and hobbyists prototyping with tri-color eInk panels up to 300x400 resolution.

Who this suits and who should look elsewhere

This breakout suits developers building prototypes with compatible 24-pin eInk displays who need integrated voltage management and a local frame buffer. It is not for buyers who want a display included in the package. It is also not for projects that require driving displays larger than 4.2 inches or resolutions higher than 300x400.

Key specification: 32KB SRAM frame buffer

The onboard 32KB SRAM holds a full frame buffer for a 300x400 tri-color panel, which requires approximately 30KB per image. This capacity lets you compose the entire display content in memory before initiating the write-only transfer to the eInk panel. If your application needs to buffer multiple frames or larger images, this SRAM size will be insufficient.

Puncte forte

  • Controls tri-color 4.2" 300x400 displays
  • 32KB SRAM buffers full 30KB frames
  • Shares display SPI port for simpler wiring
  • Includes power supply and level-shifting circuitry
  • 24-pin connector fits standard eInk panels

Specificații

TypePrototyping Products

Întrebări despre acest articol

How do I verify the board is driving a 4.2 inch 300x400 tri-color panel correctly after wiring it up?

Load a test pattern into the 32KB SRAM buffer, trigger a full-panel update, and confirm the 30KB image appears without artifacts on the attached display.

What comes in the box and which display must I source separately?

The breakout friend ships alone; you must buy a compatible 24-pin eInk panel up to 4.2 inches yourself.

Which capacity version should I choose for a 300x400 tri-color panel?

The 32KB SRAM version is sized for the 30KB frame buffer a 4.2 inch 300x400 tri-color display requires.

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