"sketch_dec29a.ino:3:20: fatal error: Keypad.h: No such file or directory
compilation terminated.
Compile error."
Please let me know why this phrase appears
"sketch_dec29a.ino:3:20: fatal error: Keypad.h: No such file or directory
compilation terminated.
Compile error."
Please let me know why this phrase appears
Your question is not about the Arduino website. It seems to be a programming question so I have suggested to the Moderator to move your Thread to the Programming section.
The error means what it says. It cannot find a file called Keypad.h. Either you have spelled the name incorrectly (case matters) or you have not properly installed a library that contains the file.
If that does not make sense then post your complete program.
...R