PL2303 - USB to UART Converter for Arduino Pro Mini

PL2303-CONVERTER.JPG This is what you get from ebay for a very cheap price

Most cheap PL2303HX USB to UART adaptors from ebay usually don’t have DTR pin to upload sketch easier to Arduino Mini Pro.
This post will show you how to mod this little adaptor to play nice with arduino mini pro. It should take about 10 minutes and require good solder skill.

The circuit


This is how you do it:


Step by step








You can use sticky tape to cover the text “3.3v”.

Compare with the other version I have at hand


Driver for windows 10 - PL2303HX

It’s funny when the old driver works fine in windows 10 but the newer ones are not.

PL2303-driver1.png PL2303-driver2.png

Alternately, you can use CP2102 USB to Serial Converter instead of PL2303 as windows 10 automatically recognizes it. No driver hassle. It also has DTR pin and some other useful pins as well.

  1. Peter

    Friday, October 30, 2015 - 11:21:08


    Thank you, The Drive works perfectly with Windows 10.
    you are a person of good heart.

  2. bob

    Sunday, January 3, 2016 - 21:24:11


    Nice tutorial, I’ll try it. Thanks!

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