Making a clock with a common microcontroller like an Arduino isn’t very difficult ... an ESP8266 can serve as a simple clock and it gets set via NTP which is even better.

To make things a little easier on yourself, Arduino shield-maker 1Sheeld shows off how to hack a clock to change color depending on traffic conditions. The idea here is to use a cheap clock from ...

It’s something [FrankBuss] has approached with an Arduino-based counter ... and thus claims atomic accuracy due to its clock being tied to a master source via NTP. The Rust code PC-side provides ...