I have stumbled over a project where a guy connects four 1602 LCD-screens to an Arduino Uno, only using 9 (I think) of the I/O pins.
Link to project: 4 LCD displays on 1 Arduino - hackmeister.dk
So I was wondering if anybody knew what the induvidual signal pins was used for? In his example, he has five of the six pins shared between all of the LCD’s, and only one signal pin to each screen from the Uno. All the data has to go through that single signal pin, then, rigth? Since if it didn’t, all the LCD’s would have displayed the same information?
Summary for question:
- what are the induvidual pins used for?
- are the five pins shared really that useful afterall?
Or is there just something obvious I am missing here?