I'm currently getting into DIY electronics and Netduino programming and there's this one personal project that I want to do but I'm hesitant because of lack of information. Basically this is what I want to do:
Use a mobile phone, in my case an Android tablet (Galaxy Tab) and maybe a WP7 handset in the future, to communicate with a Netduino via a makeshift serial connection using the audio (headphone) port and a custom app. I have found a circuit that I could use and modify for my needs so this part can be considered solved... apart from the app, that is, but that's a different story.
So with that, I also wish to be able to transmit information to the Galaxy Tab via the tablet's microphone input by designing a DAC circuit to emulate an electret mic. Is this even possible? I am no electrical engineer but I do have electronics know-how (although that's with regards to high-voltages) because of my line of work but I have little experience working with digital/analog conversion circuits. I don't want to fry my Galaxy Tab's innards because of assumptions so I've been searching for information around the net to no avail. I hope someone can point me to the right direction. Will really appreciate it!
Thanks a bunch,