6
instead of 9, it printed 90
No, it didn't: it printed “9”. However, it did not erase the previous
value before printing “9”. Before printing the 9, the LCD had:
┌────────────────┐
│time left │
│10 │
└────────────────┘
^cursor position
When you printed “9”, that character replaced the “1”, and you end up
seeing “90”.
The fix, as pointed ...
2
The object called lcd that you create inside the setup function is a local variable. It only lives as long as that function is executing - so not very long. It doesn't exist outside that function.
The lcd object you have in namespace display on the other hand is a global variable. That one lives as long as your program, which means until you reset your ...
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