![]() In fact, a reset button is only needed in emergency situations: if an Arduino board no longer responds to the serial port if a new sketch has to be uploaded. The port should now be available and visible again. Because it is time consuming and annoying to repeat this every time, it is better to avoid it: Add a delay at start-up By quickly pressing this button two times, the board will reset and stay in bootloader mode, waiting for communication on either USB or USART. Note that the Arduino Zero bootloader has a double-tap on reset button function. ![]() Sometimes this doesn’t work, so always use a reset button. Unplug and plug in the USB connector when there is no reset button.Since the port is busy, it can’t be respond anymore. This can happen among others when a sketch is continuously printing to the serial monitor. Port 10 may be selected already, ignore any message about that. Note that you must use always use the same USB connector on your laptop now. If Ports is not listed in the Device Manager than open the View menu and select “Show hidden devices”. For example, if the com port has initially the number 9 and changes spontaneously into number 10, we have to do the following (in Windows 10):Ĭontrol panel > Device Manager > Ports > Arduino Zero > RMB > Properties > Port settings > Advanced > Com Port Number set to 10 > OK This problem drives you crazy easily it has to be solved in Windows. If the serial com port number changes randomly The serial port number changes randomly.īecause these problems get on your nerves after a while, I have several solutions that will help.There are two major problems with the native USB port: The reason is that the sketch disrupts the native port, which will be grayed out as you can see here: Caused by: jssc.SerialPortException: Port name - COM4 Method name - openPort() Exception type - Port busy. ![]()
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