Cyber Badge: an ESP32-C3 name badge that plays a video of you

Cyber Badge, by Diaa (engineerdiaa on GitHub, @diaawastaken on Instagram), is a simple soldered build on one 60 × 80 mm perfboard. A 1.69in ST7789 TFT (240 × 280) loops a short video clip of you at a steady 16 fps (measured), and a 0.96in SSD1306 OLED shows your name and title with your email or handle scrolling along the top. The clip is stored in the ESP32-C3 Super Mini's flash as JPEG frames and sent to the screen with DMA. Power comes from a 3.7 V LiPo (the author's is a 600 mAh pouch behind the TFT) through a TP4056 charger with protection and a slide switch into the C3's 5V pin. Charging is over the TP4056's USB-C. The BOOT button switches between clips if you add more than one, and the badge remembers your choice. On your PC, two Python scripts turn a phone video into the firmware header: they crop and retime it, add scene labels that type themselves in (like 01 // TRAIN) and optional effects, a word that orbits around you or a sticker outline, which need a cut-out of you, made once with make_masks.py. About 15 seconds of video fits in total. You program it from the Arduino IDE with a few libraries (Adafruit GFX, SSD1306 and ST7789, JPEGDEC and bb_spi_lcd). The README walks through the wiring tables, header soldering, a multimeter check of the TFT's CS pin and a short check before first power-up. Two cautions from the author: TP4056 modules charge at 1 A by default, which is more than most small LiPos are rated for, so check and lower it for a small cell; never connect the battery to the C3's 3.3 V pin; take power from the TP4056's OUT+/OUT−, never B+/B−, which bypasses the battery protection; and switch the badge off before plugging USB into the C3, because with the switch on the USB 5V and the battery meet at the 5V pin. Licences: firmware and tools MIT, hardware CERN-OHL-P v2, docs and images CC BY 4.0, with credit to @diaawastaken.