What does the app do?

It’s used to control a USB serial device(Arduino, ESP32, ESP8266, Serial servo and so on) with graphical user interface. The user interface is built with html and JavaScript and it can be customized through web browser. With this app you can easily create a beautiful, functioning interface for your Microcontroller Projects. No struggle for display, button, power source.

JavaScript is very easy to use, you can do the logic with JavaScript and let microcontroller to do the basic functions(To control pin, analog Read and so on).


  •   Automatically start app on device connect(Qinheng CH340).
  •   Hex and text communication.
  •   Customer interface and functions (html and JavaScript).
  •   No Ads.
  •   No Root required.

How to start?

Step 1.
Install OTG UI App on your Android phone.
Step 2.
Go to http://www.OTGUI.com/home?mc=download. Download the Arduino example or Micropython example. Upload it to your device.
Step 3.

Connect the device to your Android phone through OTG adapter.
It will ask if you allow the app OTG UI to access the USB device.
Select use by default for this USB device and click OK button.
Now you can control you device.