E-paper 24P Shield works with Arduino
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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 | 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