![]() In fact, throughout the video, the instructor constantly reminds the viewer to disconnect from Pronterface before attempting to upload new firmware via the Arduino IDE. It is a long video, but extremely informative. See the video tutorial, #18: Calibration, by BuildA3DPrinter. Sometimes, the software can get confused, and keep hold of the COM port, although this is unusual.įor example, if you are connected to your board via Pronterface, and without clicking on Pronterface's Disconnect button first, you then try to upload some code to the Arduino via the Arduino IDE, the Arduino IDE will just sit there complaining that it can not connect - usually with an error, or a timeout message, like this: avrdude: stk500v2_ReceiveMessage(): timeout Only one application can access the Arduino Mega board, via the COM port, at a time.
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