However, if you use an LCD module with I2C interface, you only need 2 lines to process the display information. Now a days, it is not necessary to buy an expensive I2C LCD for this task because ...

To communicate with each LCD via I2C, two TCA9548A I2C multiplexers are connected to an Arduino, along with an RTC to keep track of the time and date itself. As the TCA9548A has three pins ...

We like this approach because instead of doing some hard-core LCD work he’s using prototyping equipment ... [Tech2077] grabbed an I2C port expander that uses just 2 of the RPi lines to address ...