A Hackaday reader required a new clock for their living room but had some specific requirements such as it needed to be battery driven, large enough to read easily, visible in the day and at night, require little maintenance and be “interesting”
As a result, they decided to use e-paper to create a unique design comprising four separate digits, each of which is powered by its own battery, microcontroller and display
Only the hour’s digit needs to sync with an NTP time server, using ESPNow to send time updates to the other digits, thereby saving battery life
