Arduino Communication Board

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ESP32

4.2 inch Photo Board(4C)

Published

Photo, ESP32, JD79668, SPI

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

Key Features

MCU	ESP32-WROOM-32E, 240 MHz dual-core, integrated Wi-Fi 4 + BLE.
Display	4.2-inch 4-color E-Paper (black / white / red / yellow), 400×300 resolution,FPC-24P interface, no backlight, easy on the eyes.
Storage	Internal LittleFS (~1 MB available) as primary album storage; TF card can serve as a mirror backup.
Buttons	Previous / Mode / Next three-button control for manual page change and mode switch.
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
Wireless	Defaults to AP mode hotspot (SSID: ePaperDisplay); can be switched to STA mode to join a home router
Open source	Schematics, firmware source code and Web UI are all open;secondary development is supported

Hardware

1.1 Connect Power

Use a standard USB-C data cable to connect the board to a computer or charger. On power-up the screen shows the 4-color hint image.

1.2 Connect to the Board

The board starts Wi-Fi in AP mode by default:

 SSID: ePaperDisplay

 Password: 88888888

After connecting a phone or computer to this hotspot, open the browser at http://192.168.4.1 to enter the configuration page.

1.3 Switch to STA Mode

To make the board join your home router directly, fill in the SSID and password under the Settings card of the Web UI and save. The board reboots and joins the router in STA mode. Open the browser at the IP it obtained from the router to access it on your local network (recommended for advanced users).

1.4 Upload Your First Photo

(1). Open http://192.168.4.1 (AP mode) or the board's LAN IP.

(2). In the Upload card click Choose File and pick a JPG / PNG image from your computer (recommended aspect ratio ≈ 4:3).

(3). The browser quantizes the image locally into a 400×300 4-color image (black / white / red / yellow) and shows a live preview.

(4). Click Upload; once upload finishes, the screen refreshes within ~21 seconds.

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

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