The whole clock uses 16 individual, upright rotated 16×2 LCDs that are ... To communicate with each LCD via I2C, two TCA9548A I2C multiplexers are connected to an Arduino, along with an RTC ...

The basic 16×2 LCD is an extremely popular component that ... make it so easy to work with; if you’ve got an I2C variant of the display, it only takes four wires to drive it.