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I bought an Arduino Uno recently. After getting the necessary cables, I decided to upload an example to the chip. Instead of seeing that Blink, I received an error like processing.app.SerialException: Serial port 'COM1' not found. Did you select the right one from the Tools > Serial Port menu? Yes, I tried that.

But even Serial Port Monitor doesn't seem opening. Then again, I get some exception that isn't worth mentioning. After I found out that my Serial COM ports don't work (via Portmon.exe), and figuring out that I may even don't have any (there is no COM port in Device Manager), I also tried to download a driver for COM port, but it has also failed. Some say that it's because of my Acer Aspire 5742's motherboard. Some say that the reason is Windows 7. Long story short, I'd really appreciate if someone can help me with my COM port problem and mend my broken dreams.

Installing Drivers for Arduino in Windows 8 / 7. ( I tried it for Uno r3, but i believe it will work for all Arduino Boards ) Plugin your Arduino Board Go to Control Panel ---> System and Security ---> System ---> On the left pane Device Manger Expand Other Devices. Under Other Devices you will notice a icon with a small yellow error graphic.

(Unplug all your other devices attached to any Serial Port) Right Click on that device ---> Update Driver Software Select Browse my computer for Driver Software Click on Browse ---> Browse for the folder of Arduino Environment which you have downloaded from Arduino website. If not downloaded then After Browsing mark include subfolder. Click next ---> Your driver will be installed. Collapse Other Devices ---> Expand Port ( its in device manager only under other devices ) You will see Arduino Written ---> Look for its COM PORT (close device manager) Go to Arduino Environment ---> Tools ---> Serial Port ---> Select the COM PORT as mentioned in PORT in device manager. (If you are using any other Arduino Board instead of UNO then select the same in boards ) Upload your killer programmes and see them work.. I hope this helps..

Dec 4, 2016 - The IDE fails to upload saying it cannot find anything on the COM port on Windows. Similar error on Mac. Caused by: processing.app.SerialException: Error touching serial port 'COM5'. Caused by: jssc.SerialPortException: Port name - COM5; Method name - openPort(); Exception type - Port busy.

Note that if you get a second Arduino of a different model, then you will have to do the driver-installation steps again. For instance I had been using an 'old' Uno, then got a new 'Esplora' --they are both listed as Com3 when plugged into the right side USB port of my laptop, but a different number for the other side. One other point of confusion is that the subMenu under the Serial Port menu needs to be selected, even if it is the only choice. Also, don't forget to change 'Board' menu. – Feb 13 '13 at 5:59.

I try to upload arduino code to an Arduino Mega. The serial port is detected the first time I plug in the board. As soon as I upload, I get an error saying 'Error opening Serial Port '. And then the Serial Port option is not available for some time. The error repeats the next time I try to upload. Binary sketch size: 1,500 bytes (of a 258,048 byte maximum) processing.app.SerialException: Error opening serial port '/dev/ttyACM0'.