Serial monitor font arduino can't show

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Hello my serial monitor font is get trouble, i can't fix it, anybody knows ? enter image description here

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Either the sending device is sending non-sense or non-ASCII data or (more likely) you have a baud rate mismatch.

The serial interface you're using here is asynchronous. That means there is no common clock to synchronize communication. Hence the receiving side must know the baud rate of the sender or vice versa. If you're sampling the Rx line with the wrong frequency you don't recieve what has been sent but more or less random characters.

Alter the baud rate setting until you read the correct data.

Give this a read

https://learn.sparkfun.com/tutorials/serial-communication/all it explains serial communication for beginners.