Enter text.

Send String

Enter bytes values separated by spaces.

Send Bytes

This is a demo page for the AudioSerial JavaScript library.
Sourceforge page

If you have a device with
1) a headphone jack and
2) a browser that supports HTML5 and JavaScript (which is any modern browser)
then you can send serial commands to your MCU/MPU. Just add a few parts in-line to your project's RX (like this.)