His latest build, a hardware GPS module attached to the TI-84 Plus ... Many a calculator modder has put a lot of work into documenting the USB port on the 84 Plus, revealing it is a USB OTG ...

The heart of the build is a NEO-6M GPS module which features a dedicated pulse per second (PPS) pin. The ESP8266 combines the timestamp from the GPS messages and the PPS signal to synchronize ...