Serial USB Terminal

Kai Morich

In-app purchases

About this app

'Serial USB Terminal' is a line-oriented terminal / console app for microcontrollers, arduinos and other devices with a serial / UART interface connected with a USB to serial converter to your android device.

This app supports USB to serial converters based on
- FTDI FT232, FT2232, ...
- Prolific PL2303
- Silabs CP2102, CP2105, ...
- Qinheng CH340, CH341
and devices implementing the USB CDC protocol like
- Arduino using ATmega32U4
- Digispark using V-USB software USB
- BBC micro:bit using ARM mbed DAPLink firmware

To connect USB to serial converters, your android device must support USB OTG aka. USB host mode. Most devices support this today, but in case of issues check with one of the various USB test apps, if host mode is enabled in your android kernel.

All features in this app are free. In-App purchase is only used for the 'Donate' option.

Looking for source code? Here you find a simplified variant of this app:
https://github.com/kai-morich/SimpleUsbTerminal

Ratings and reviews

Worked quite well. I used it for a firmware update over a stm32 board. My USB-to-UART is PL2303. AGM H3 otg phone. Would be nice to have Mx macro buttons customizable with a file-send action (like M1 = send file fw01.bin and M2 = send file fw02.bin). This is because microcontroller bootloaders usually have a timeout protection and the data stream must start very quickly. I also suggest developers to add colour selection for sent and received text instead the actual green/yellow. Thank you.

Excellent app, extremely useful for capturing serial data in the field. The only issue I have found, is that while logging 8 bit raw hex data, it appears to insert a 0x20 after every second byte in the log file.

I never really get to review apps cuz.I never have to re-download them, but this app because I recall it being was bomb, I got the preload of a bunch of commands for my do we know firmware project and it was pretty solid?I could walk around and cause all sorts of great stuff.It was a solid app. lacking , as I recall a number of functions , but totally legit

What’s new

1.60 2026-07-18
NEW support input control lines for CDC devices. Only some CDC devices support control lines and CTS is not supported at all
1.59 2026-06-09
NEW scale font with 2-finger pinch
1.58 2026-05-01
NEW macros w/o newline
NEW hex macros with delay
1.57 2025-11-07
FIX copy from main text view with unmodified spaces
INFO Android 5.0 as minimum version
1.56 2025-03-17
FIX single CR handling for newline CR+LF setting