For microcontrollers, Arduinos, and other devices with a serial or UART interface linked to your Android device via a USB to serial converter, there is an application called "Serial conn" that functions as a line-oriented terminal or console.
Device Compatibility
Chips that convert USB to serial are supported by this library:
FT230X, FT231X, FT234XD, FT232R, FT232H, and FTDI..
The CDC/ACM protocol is implemented by Prolific PL2303 Silabs CP2102, CP210* Qinheng CH340, CH341A, and CH9102 devices.
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