1.54 inch 4-color E-paper photo board
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ESP32
Introduction
1. Product Overview
The 1.54" BWRY Mini Photo Album is a low-power frame built around the ESP32-C3 Super Mini controller and a 1.54" BWRY four-color e-paper display (driver IC: JD79660). It needs no internet or mobile app; just connect to the hotspot it broadcasts and open 192.168.4.1 in any browser to upload photos, browse the album and configure the slideshow. The device has no physical buttons or TF card slot, so all interaction is done in the browser;photos are stored in the on-board LittleFS file system and survive a power loss. The screen supports black / white / red / yellow four-color display; combined with the browser-side Floyd-Steinberg dithering, it renders color photos in fine detail as a four-color e-paper image.
2. Key Features
1.54" BWRY four-color e-paper (200 × 200,2bpp, 10,000 bytes per frame).
WiFi AP direct mode: SSID = ePaperAlbum, password 88888888,IP 192.168.4.1.
Four-color dithering is done in the browser (no server involved); each image uses only ~10 KB of data.
LittleFS stores photos; NVS saves the current display and slideshow settings.
Supports gallery list, single-image switching, single/all deletion, and slideshow auto-play.
Supports EN / RU bilingual Web UI (English / Russian Web).
HTTP server starts before the boot refresh and keeps responding throughout it, so it isaccessible as soon as you join the hotspot.
3. Use Cases
Compact desktop photo frame: plug in and use, with no dependence on a router or cloud service.
Gift / ornament: converts photos of family and friends into a four-color e-paper style display.
Embedded / IoT learning reference: a complete ESP32 + WebServer + LittleFS practice.
Specifications
| MCU | ESP32-C3 Super Mini (RISC-V single core, 4 MB Flash, 400 KB SRAM,WiFi + BLE)
|
|---|---|
| Display | 1.54" BWRY four-color e-paper (driver IC: JD79660) |
| Resolution | 200 × 200 pixels, 2bpp (4 pixels / byte, MSB-first, row-major) |
| Data per Frame | 10,000 bytes / frame |
| Refresh Time | 12 ~ 15 s / full refresh (determined by the driver IC) |
| Storage | On-board LittleFS (about 2.34 MB usable) |
| Wireless | WiFi AP mode (2.4 GHz, CH6, up to 4 clients) |
| Interface | USB-C (power + program download) |
| Buttons | None (all interaction via the browser) |
| TF Card Slot | None (photos stored in LittleFS) |
Hardware
The expansion board routes display bus, touch signals, and SD card interface to standard headers. Confirm controller board logic level before use.
Size
- Align the expansion board with the controller board header.
- Install the matching display driver library.
- Run color and touch test examples.
- Adjust pin definitions and UI per project requirements.
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