This clock was created to experiment with two parts that have been lying around my parts bin for a while. The first one is an under-documented ESP32-S2 module, pretty cheap though. The other is an 8 digit display unit built around the TM1638 I/O expander chip.

The microcontroller runs a code that retrieves Unix Time from aNTP server and shows it on the 7 segment display, down to the seconds, using hexadecimal numbers, just because I don't have enough digits to use decimal.

The whole thing is a patchwork, including the firmware copied and pasted from a handful of examples; nevertheless the connection with my wireless home network is performed using wi-fi manager, instead of hard-coding the SSID and password.