Any ideas how to implement external send/end button function for some cellphone, Android for example ?
I have been thinking about small USB microcontroller combined with Android (or other os) application built for this purpose.
Using headset button would not work, as audio will have to be on the cellphone speaker/mic, not headset.
Some way to have information about cellphone status (like "service indicator", "call connected",...) would be nice to have as well, but not mandatory.
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