Or perhaps you can combine both worlds, which is what [oldmaninSC] did with his digital clock ... LCD via I2C, two TCA9548A I2C multiplexers are connected to an Arduino, along with an RTC to ...

The build relies on that old stalwart, the Arduino Uno, to run the show. It’s hooked up to a DS3231 real-time clock module so it can keep accurate time for long periods, as is befitting a clock.