It’s based on the WarCollar Dope Scope, a tiny, portable device consisting of an off-the-shelf Chinese OLED display, an ESP8266 module, and a PCB that can charge batteries, provide a serial port ...

The heart of the build is a NEO-6M GPS module which features a dedicated pulse per second (PPS) pin. The ESP8266 combines the ... [Cristiano] added an OLED and some LEDs to provide feedback ...

At its core, it is just an ESP8266, a cheap simple Wi-Fi chip that ... In addition to the OLED screen, the watch features a convenient web interface that you can use to connect via your smartphone ...