E-paper 24P Shield: Difference between revisions
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== <span style="color: rgb(52, 176, 176);">About the Arduino Interface</span> == | == <span style="color: rgb(52, 176, 176);">About the Arduino Interface</span> == | ||
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. | 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. | ||
|specs={{{!}} class="wikitable" | |||
{{!}}+Pin Description | |||
!Pin | |||
!Direction | |||
!Description | |||
{{!}}- | |||
{{!}}3V3 | |||
{{!}}Power input | |||
{{!}}<div>Supplied from the 3.3 V rail of the Arduino mainboard; powers the e-paper driver circuit.</div> | |||
{{!}}- | |||
{{!}}GND | |||
{{!}}Power ground | |||
{{!}}<div>Common ground, connected to the GND of the Arduino mainboard.</div> | |||
{{!}}- | |||
{{!}}SCK | |||
{{!}}SPI clock | |||
{{!}}<div>SPI bus clock line, output by the Arduino host.</div> | |||
{{!}}- | |||
{{!}}SDA | |||
{{!}}<div>SPI data / MOSI</div> | |||
{{!}}<div>Data line sent by the SPI host and received by the e-paper screen.</div> | |||
{{!}}- | |||
{{!}}CS | |||
{{!}}Chip select | |||
{{!}}<div>Active low; selects the current e-paper screen for communication.</div> | |||
{{!}}- | |||
{{!}}DC | |||
{{!}}<div>Data / Command</div> | |||
{{!}}High: data transfer; low: command transfer. | |||
{{!}}- | |||
{{!}}RES | |||
{{!}}Reset | |||
{{!}}<div>Low level resets the e-paper driver; a falling edge after power-up is recommended.</div> | |||
{{!}}- | |||
{{!}}BUSY | |||
{{!}}Status input | |||
{{!}}<div>E-paper busy flag; high means a refresh is in progress and the MCU should wait.</div> | |||
{{!}}} | |||
|hardware=Core signals include SCK, MOSI, CS, DC, and RESET; backlight is independently controlled. Do not apply 5V directly to 3.3V signal pins. | |hardware=Core signals include SCK, MOSI, CS, DC, and RESET; backlight is independently controlled. Do not apply 5V directly to 3.3V signal pins. | ||
|usage=# Connect power and SPI signals per the pinout table. | |usage=# Connect power and SPI signals per the pinout table. | ||
Revision as of 10:04, 8 September 2026
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
- Connect power and SPI signals per the pinout table.
- Configure chip select and orientation in the driver.
- Run a solid color test first, then load the graphical UI.
- Adjust SPI clock based on bus length.
FAQ
- Why is the screen all white?
- Check reset, chip select, data/command pins, and initialization model.
- What if the image has noise?
- Lower the SPI clock and shorten the connection wires.
Downloads

