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

No way to up arrow commands is a deal breaker for Cisco work. Up arrow scrolls through the last few commands in IOS. It is necessary to replay command strings to quickly modify several ports on a switch. Without this it makes modifications much more difficult. I could use this instead of a windows machine if this were possible here. It is the best one out there, but just is not enough to depend on for me.

I tried so many serial apps and this was by far the best. I wish that it auto detected my serial port and it doesn't work with the HP network switch's help function. However, it did really well at displaying the terminal properly and allowing me to enter the command I needed. I guess I need to stop relying on the help menus so much.

Combined with the right adapters (like USB-C to USB-A,) this app turns your phone into a very useful engineering tool for embedded systems development. The limitations of a phone's on-screen keyboard are mitigated by the costom macro feature which permits otherwise-untypable control characters to be sent either instantaneously by themselves or inserted into a longer message.

What's new

1.54 2024-06-02
NEW disable send button if send takes more than 0.2sec
FIX sending large data at very low baud rate caused 'connection lost'
FIX reduce CPU/battery usage when control lines are shown
1.53 2024-01-12
FIX improved notification enabling
1.52 2024-01-09
NEW added "Settings > Misc. > Show notification when connected" because not shown in notification bar by default on Android 14
FIX Android 14 USB permission dialog response handling