Vintage Original HP Bubble Red LED Retro Display HP 5082-7413 Fd1f11 | Compra online en eBay
DIY Breadboard watch using a QDSP-6064 bubble LED display and a 14 pin ATtiny84. It's rechargeable with a USB-micro connector to PSU underneath the breadboard. Here's the schematic and documentation: https://flux.ai/jharwinbarrozo/breadboard-wrist-watch :