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Connecting Arduino with phone using OTG
Android arduino usb otg
Use usb-serial-for-android app to send data from your phone to arduino or any serial device
Arduino Android Usb Control - Serial Communication
Setting up OTG communication with MIT app inventor
New App for programming your Arduino/ESP board | How to program Arduino and ESP board In Android
How to Enable OTG on Android (On the Go adapter Option)
453 Use your Arduino and ESP32/ESP8266 from your Smartphone. No Cloud! (RemoteXY)