// the find
peng-zhihui/HoloCubic
带网络功能的伪全息透明显示桌面站
A DIY desk toy from Bilibili maker 稚晖君 (Zhihui Peng) that uses a beam-splitting prism over a 240x240 ST7789 screen to fake a holographic display, built on an ESP32-PICO-D4 with WiFi/Bluetooth for small connected apps like weather and follower-count widgets. It's for hobbyists with a 3D printer or CNC access and some Arduino experience, not a plug-and-play product.
The pseudo-holographic trick itself is genuinely clever and cheap — a $10 prism plus OCA adhesive instead of any exotic optics. Using the MPU6050 IMU as a gesture-based rotary encoder substitute (tilt instead of a physical knob) is a neat interaction hack. The repo ships a Visual Studio LVGL simulator so you can iterate on UI without cross-compiling and reflashing the ESP32 every time, and a custom batch image-to-.bin converter because the official LVGL tool only handles one file at a time. Full open hardware too: two PCB revisions, four enclosure variants, BOM under ¥50.
The author states outright the firmware is 'temporary, messy code' with no app-layer logic released — what's here is driver plumbing, not a working feature set. Getting it running requires manually patching a hardcoded MISO pin inside the installed ESP32 Arduino core's SPI.cpp, which is fragile and will silently break on core upgrades. No LICENSE file, PCB files are locked in Altium's proprietary format, and the Windows conversion tool is only distributed via a Baidu Netdisk link. Last push was October 2023 with no app code ever following up, so treat this as a frozen hardware reference rather than a maintained firmware project.