The spurious output does not occur when the output is triggered by resetting the board, so it is specific to the upload operation. The number of `□` in the demonstration matches the number of characters that are printed by the sketch.

Serial monitor output always reflects the data sent by the board. 🐛 The output starts with some unexpected content: Upload a sketch to your board that prints to `Serial`: Arduino board that uses the ATmega16U2 USB chip:ġ. The first output printed to Serial Monitor after an … upload is some 'garbage' characters. Serial.print(F('0123456789abcdefghijklmnopqrstuvwxyz9876543210 ABCDEFGHIJKLMNOPQRSTUVWXYZ')) Please note, this doesn't happen if I upload the same sketch to my Uno. In the last few days I purchased an Elegoo ATmega 2560 R3 and can confirm that it is behaving exactly the same as the authentic Mega 2560 R3. The device is authentic Arduino Mega 2560 R3. This is pretty much stopping my development which after using the 2.0 IDE for a couple of months now is really a concern for me.ĭevelopment platform: 2.0 IDE rc6, then rc7 installed on Windows 10. Here is a simple sketch that now will display only gibberish on the IDE monitor but works fine with Tera Term.

Was doing same in rc6 sometimes but I could get it to work correctly by uploading any different sketch and then reload the one that had previously had the problem.Īs mentioned, it now happens almost all the time and with any sketch loaded. Problem is occuring 95% of sketch uploads for IDE rc7. However, if I connect to the COM port using Tera Term it displays correctly.

Any serial output to the monitor is displaying gibberish (like the baud rate is wrong).

Tera term for windows 10