E-paper 24P Shield

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Arduino

E-paper 24P Shield

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Arduino

Introduction

E-paper 24P Shield is an e-paper shield compatible with the Arduino standard interface. Through the onboard FPC 24P connector (0.5 mm pitch),

it accepts various FPC 24P interface e-paper screens, and pairs with any mainboard supporting the Arduino interface via standard Arduino pin headers.

Key Features

 Plug and Play: using the universal Arduino pin-header interface, it stacks directly onto Arduino UNO / Leonardo / Mega and other standard mainboards.

 Multi-Screen Compatible: via the FPC 24P interface, it supports various 24P e-paper modules (black/white / black/white/red / black/white/red/yellow etc.).

 Vendor Compatible: via the P2 jumper, select 2.2 Ω / 0.47 Ω resistance to match different vendors' e-paper screens.

 Low-Power Friendly: an e-paper screen consumes zero power for static display, ideal for battery-powered IoT labels, price tags, reminder boards and similar scenarios.

About the Arduino Interface

The Arduino header interface is a universal standard in the open-source hardware world and is not exclusive to any particular mainboard. Any mainboard following the Arduino UNO R3 pin definition (such as Arduino UNO, Leonardo, Mega, ESP32-Arduino compatible boards, etc.) can be used directly with this Shield.

Specifications

Pin Description

Pin	Direction	Description
3V3	Power input	Supplied from the 3.3 V rail of the Arduino mainboard; powers the e-paper driver circuit.
GND	Power ground	Common ground, connected to the GND of the Arduino mainboard.
SCK	SPI clock	SPI bus clock line, output by the Arduino host.
SDA	SPI data / MOSI	Data line sent by the SPI host and received by the e-paper screen.
CS	Chip select	Active low; selects the current e-paper screen for communication.
DC	Data / Command	High: data transfer; low: command transfer.
RES	Reset	Low level resets the e-paper driver; a falling edge after power-up is recommended.
BUSY	Status input	E-paper busy flag; high means a refresh is in progress and the MCU should wait.

Hardware

Core signals include SCK, MOSI, CS, DC, and RESET; backlight is independently controlled. Do not apply 5V directly to 3.3V signal pins.

Size

FAQ

Q1: No display at all after power-on?

Troubleshoot in this order:

① Check whether the FPC 24P cable is fully seated and correctly oriented;

② Measure 3V3 and GND with a multimeter for 3.3 V;

③ Confirm the pin definitions in your program match the table in this manual;

④ Inside setup(), before calling display.hibernate(), wait for BUSY to go low. You can also refer to the provided example sketch and flash it directly.

Q2: Garbled display / ghosting?

Usually the refresh cycle did not complete. Call display.refresh() once outside the loop for a full refresh; if the problem persists, check whether the P2 jumper resistance matches the e-paper screen specification.

Q3: Can a 5 V powered Arduino mainboard be used?

Yes. The Shield's 3V3 is supplied by the regulator on the Arduino mainboard itself; a 5 V mainboard (e.g. Arduino UNO) has an onboard 3.3 V LDO that can power the Shield directly.

Q4: Are other communication protocols supported (e.g. I2C screens)?

This Shield is designed for SPI interface 24P e-paper screens. If you need an I2C screen, you can use another I2C-supporting shield, or rewire to SDA / SCL.

Downloads

Document

E-paper 24P Shield User Manual v1.0-EN.pdf

Download

Document

E-paper 24P Shield User Manual v1.0-RU.pdf

Download

Document

E-paper 24P Shield SchDoc V10.pdf

Download