Good day,
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:
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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.
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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,
Dan
Best Answer
I did more research and learned that my original plan was a lot more complicated than it needed to be. I found that I could use frequency shift keying (FSK) like the one I saw here and here which are both for the iPhone and should be usable for other devices with little or no modification. I'm currently researching how to do it directly using C# code on the Netduino which isn't in the scope of this site anymore so I have to find help elsewhere.
Anyway, thanks to both Joe and Chris Stratton for providing answers. I'm sorry if I had to unset Joe's answer for my question as it does not apply anymore. Both answers are still very informative on my side though so thanks a lot. I'd probably make use of them in another project.