Port option greyed out

Development Tools IDE 1.x
7

You need to install the driver for the CH340 USB to serial adapter chip used by your Arduino board. You can install the driver for the CH340 USB to serial adapter chip used by your Arduino board by following these instructions:

  1. Open the page on the Chinese manufacturer of the CH340's website that provides the driver downloads: http://www.wch.cn/downloads/CH341SER_ZIP.html
  2. Click the button with the cloud and downward pointing arrow to download the driver.
  3. Wait for the download to finish.
  4. Unzip the downloaded CH341SER.ZIP file.
  5. Open Windows Device Manager.
  6. Connect the CH340-based board to your computer with a USB cable.
  7. You should see a new device appear under the "Other devices" section of the device tree. Double click on it.
  8. Click the Update Driver... button.
  9. Click "Browse my computer for drivers".
  10. Click the Browse... button.
  11. Select the unzipped folder of the download from the WCH website.
  12. Click the OK button.
  13. Click the Next button.

The driver should now install successfully. After that, the CH340 -based board should appear in the "Ports (COM & LPT)" section of the Windows Device Manager device tree as "USB-SERIAL CH340 (COMn)" and the board should show up under the Arduino IDE's Tools > Port menu.

1 Like