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Serial.print(<something>);
? [2] What happens if you change the data rates (in code and Serial Monitor)? [3] If you change the first letter (H), does the displayed symbol change too? [4] If it does change, could you edit your question to include a list of half a dozen examples? The character you've shown is not part of neither the standard nor the extended ASCII tables. This suggests an extra byte is being sent or the Serial Monitor is adding the preceeding byte and decoding it along with the 'H'.ser.read()
before actual communication.ser
was the name of the Serial instance.