K8MOD
This page is about my attempt to build a low-tech smartwatch that would retrofit within these old 90s' Casio watches. I have a working prototype (PCB, BLE, Firmware (Rust), antenna: all functional) but I am missing the screen and haven't fully finalized the electronics (manufacturing issues, poor hiring choice, and because "money"). More on that at the end. The idea was to build something very simple. Do 10% of what a modern smart watch can do, for 10% of its price. Something cheap, hackable, that retrofits within a Casio watch, with a low-tech approach. K8MOD is a piece of electronics that fits right inside a Casio watch. It's made to replace the Casio module. The Casio model that I was targeting is named F91W. The most famous Casio, and according to Wikipedia, the most sold watch in the world. The main idea is to upgrade what this watch can do, without losing its retro vibe. The K8MOD module is connected to a smartphone via Bluetooth (BLE), and it would run "apps". There's enough mem