stupid question
please delete / ignore
Please post your full sketch. If possible you should always post code directly in the forum thread as text using code tags (</> button on the toolbar). This will make it easy for anyone to look at it, which will increase the likelihood of you getting help. If the sketch is longer than the forum will allow then it's ok to add it as an attachment.
Serial.print(123);
but it outputs:
[]123
how to remove [] (please see the picture I attached above)
What part of "post your full sketch" didn't you understand?
it's my fault.
I had Serial.write(5); on top accidentally.
if you can delete this post, help me to delete. Thanks