Wemos D1 Mini not recognised by Windows with no COM port

This blog post describes what you can do if Windows doesn’t recognise the Wemos D1 Mini and there is no COM port to use it.

Do this first: Check your Cable!

Your Wemos might not be found due to a faulty cable. Some cables will only transmit power and will not work.

Try using another cable, any one from an android phone should work with the Wemos. If this doesn’t work then try the next steps. Lots of readers of this post found that simply changing the cable worked!

Why is there no COM port for my Wemos D1 Mini

The standard USB-to-serial drivers installed on Windows does not currently support the USB-to-serial chip used in the Wemos D1 Mini.

The Wemos D1 Mini won’t show in the Arduino IDE until this issue is resolved. If you are using another program to program the D1 Mini you won’t have the emulated COM port needed to program it.

However it is relatively easy to fix this by installing the correct driver for the USB-to-serial chip.

Installing the required driver

The Wemos website has the correct driver to use for the USB-to-serial chips in their Wemos range. This includes the Wemos D1 mini which I am having trouble with.

You can download the driver from their downloads website.

The download is CH341SER_WIN_3.5.ZIP and the MD5 hash is: b9038b9be77a70dd411f1c9879851144

Once the driver was installed Windows reloaded the Wemos D1 mini and correctly found the driver. The COM port then appeared in the Arduino IDE and I could successfully load programs onto it.

If you have any questions about getting the Wemos D1 Mini to work feel free to ask below.


Leave a Reply

This site uses Akismet to reduce spam. Learn how your comment data is processed.