WATCH-1414 Is a Tiny 16-Segment PCB Watch
This watch was made on bare PCB with HPD1414 16-segment displays, controlled by an STM32 chip.
Nanoslavic was apparently in need of a new watch, and while he had previously made a a timepiece using six 7-segment digits in a row to signify the hours, minutes, and seconds, in this build he turned to the tiny-but-luminous HPD1414 16-segment units. These devices are notable for both their tiny size, cramming four 16-segment alphanumeric characters onto a single dual in-line package device, and their magnifying lenses that allow them to be more easily seen.
Nanoslavic created a PCB to house two of the units for a total of 8-digits on display, using HPD1414 chips that were built in 2000 or earlier. An STM32F100C8T6B microcontroller runs the timepiece, which can be used either in desktop mode, or with a USB-C rechargeable 500mAh battery. The main PCB screws into another behind it, which provides a clever accommodation for wrist strap attachment.
Three buttons are used to interact with the device, allowing the time and date to be set, as well as an alarm. This function is shown at the end of the video below, beeping along on a small piezo buzzer, while auxiliary buttons pulse to let you know it’s time to get up–or to do whatever you had in mind earlier. Firmware is downloadable via the video description, and the PCB and BOM is found here.