Check the baud rate at the bottom right from your monitor if the same with baud rate declare in your code Serial.begin(...). The differences maybe cause of weird characters
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i have same problem (using massduino MD-328D) , weird characters in serial monitor
code upload is ok and working but serial monitor is not ok...
i found, that with dfiferent baud rate is serial ok...
i upload code with baud rate 9600 but serial monitor works correctli with baud rate 2400... why so??
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