# Android serial USB app for micro:bit?

**URL:** <https://forum.makecode.com/t/android-serial-usb-app-for-micro-bit/10264>\
**Category:** micro:bit\
**Created:** [October 1, 2021, 5:06pm UTC](https://forum.makecode.com/t/android-serial-usb-app-for-micro-bit/10264 "2021-10-01T17:06:44Z")\
**Posts on this page:** 1\
**Page:** 1

<div class="post-metadata">

**Author:** ![keble6](https://avatars.discourse-cdn.com/v4/letter/k/848f3c/32.png) [@keble6](https://forum.makecode.com/u/keble6)\
**Post date:** [October 1, 2021, 5:06pm UTC](https://forum.makecode.com/t/android-serial-usb-app-for-micro-bit/10264/1 "2021-10-01T17:06:44Z")

</div>

Normally I use Beagle Terminal on my Chromebook for serial comms with a micro:bit.  
Now, I want to use a terminal app on an Android phone instead. I have tried one or two apps (e.g. Serial USB Terminal) but I can’t get it to work fully!

Here’s my micro:bit code which looks for serial input and echoes it back to the terminal app - **this works fine - the echo text is displayed on the terminal correctly**!

```auto
basic.forever(function () {
    charIn = serial.readString()
    stringIn = "" + stringIn + charIn
    if (charIn.compare(String.fromCharCode(13)) == 0) {
        serial.writeString("" + String.fromCharCode(13) + String.fromCharCode(10))
        parseCommand()
        stringIn = ""
    } else {
        serial.writeString(charIn)
    }
})

```

But when I send the micro:bit a command (which **correctly** returns data on **Chromebook + Beagle Terminal** ) then I get **no output on Android + Serial USB Terminal.**  
Any ideas?

I use normal serial commands like:  
`serial.writeString(", ")`