To communicate with each LCD via I2C, two TCA9548A I2C multiplexers are connected to an Arduino ... entire clock could be scaled up to a total of 64 LCDs — so how about a 16×4 display made ...

He set out to build a cheap projection clock using a small LCD screen, a cheap LED backlight ... His project has room to grow as well: it runs from an Arduino compatible STM32 that could handle ...