4.2 inch 4-color E-paper photo board
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ESP32
Introduction
1.The 4.2 inch Photo Board(4C) is an open-source 4-color E-Paper development board based on the ESP32-WROOM-32E MCU. It carries an onboard 4.2-inch black / white / red / yellow E-Paper display at 400×300 resolution, suitable for desktop photo frames,dynamic labels, low-power information displays, and similar applications.
2. Designed for makers, educators, and secondary developers, the board integrates a USB-C port, CH340C USB-to-serial bridge, TF card slot, three physical buttons, dual I/O expansion headers, plus the BOOT and RST buttons — flashing and debugging require no extra tools.
3. The companion sketch is built on the Arduino framework and provides a full photo-album manager plus a web configuration UI: upload an image through the browser and the board displays it. Auto-switching follows a configurable timer, with TF card mirror backup and one-click clear-all.
Specifications
| MCU | ESP32-WROOM-32E, 240 MHz dual-core, integrated Wi-Fi 4 + BLE. |
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| Display | 4.2-inch 4-color E-Paper (black / white / red / yellow), 400×300 resolution,FPC-24P interface, no backlight, easy on the eyes.
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| Storage | Internal LittleFS (~1 MB available) as primary album storage; TF card can serve as a mirror backup.
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| Buttons | Previous / Mode / Next three-button control for manual page change and mode switch.
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| Indicators | Red PWR power LED + blue USR user LED. |
| Interfaces | USB-C (power + data / flashing), TF card slot, P3/P5 and P1 dual-row I/O expansion pins
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| Wireless | Defaults to AP mode hotspot (SSID: ePaperDisplay); can be switched to STA mode to join a home router
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| Open source | Schematics, firmware source code and Web UI are all open;secondary development is supported
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Hardware
The expansion board routes display bus, touch signals, and SD card interface to standard headers. Confirm controller board logic level before use.
Size
FAQ
- What if compilation shows insufficient capacity?
- Reduce font and bitmap resources, or choose a controller with more capacity.
- What if colors are abnormal?
- Check driver model, color order, and initialization orientation settings.
Downloads