[SOLVED] Arduino suddenly stops

Robin2:
Sorry, but that is ambiguous. Which part of my question are you referring to?

And what does "not necessarily" mean in this case?

...R

car runs fine without "sp.write("z")".

Robin2:
Sorry, but that is ambiguous. Which part of my question are you referring to?

And what does "not necessarily" mean in this case?

...R

program sends one character at a time. one for press down one for press up. when you release any button 'z' character is sent. "not necessarily" means car runs fine without sp.write("z") part.