Output serial commands from the audio port! You can control any serial device (Arduino, BASIC Stamp, etc.) from your android phone without rooting or bluetooth. This app can be called as an intent or integrated with other apps. Order a cable for this for only $15, or build your own - email [email protected]
for source code and schematics.
*Now supports 19200bps
*Output intent that can be called from another app to output data serially
*Signal inversion can now be done in software
*Better compatibility with early Droids