GPS clock

Cloned triple version

EU option

Backwards compatible version which can be Europeanized with formats for date and units. It also has possibility for removing battery icon, when run from a USB supply.

New boolean variables to set:

1. US_UNITS - if false: m, kmh, Little-endian date with '.' (example: 20.11.2022), if true: feet, mph, Middle-Endian date with '/' (example: 11/20/2022)
2. BATTERY_DISPLAY - true: as original code, false: no display of battery icon and status

Fixes

1. New way of initializing Serial1 as the original one didn't compile in Arduino IDE 1.8.13. See https://github.com/stm32duino/wiki/wiki/API#hardwareserial
2. The satellite count in the upper right corner is more agile so it now drops to 0 when GPS signal is lost, rather than stay forever at last satellite count.

Images

Original write-up

This is an Arduino-based digital clock using a GPS module, Blue-Pill microcontroller, and ILI9341 TFT display. Accuracy is within a few microseconds. See w8bh.net for details and step-by-step explanation.