LCD Code

Projects General Guidance
1

So how do you use an "if then" sequence to detect if the lcd printed something Specific Such as "2A" or "1B"?

2

So how do you use an if then sequence to detect if the lcd printed something Specific Such as 2A or 1B

X-Y problem.

What lcd display do you have which prints something without you telling it what to print? Why do you think it did not print what you told it to print?

3

to do an different thing

4

Also the input is an 4x4 keypad
[123A]
[456B]
[789C]
[*0#D]

5

And is it possible for the Arduino to read the lcd and then do a different output?

6

http://forum.arduino.cc/index.php?topic=498210.0

7

PIUS1212:
And is it possible for the Arduino to read the lcd and then do a different output?

Whether the Arduino can actually read from the 'lcd' would depend on the lcd in use, there are lots of different types.

But its a non-issue anyway, if the Arduino writes to the display, its knows what has been written, so there is no need to read back what the Arduino knows it has written.

8

I see nothing in the OP to suggest that the device writing to the LCD is also the device reading the LCD.