gordon 229 Posted May 26, 2011 Share Posted May 26, 2011 Appears I aimed a bit too high with my first project, and am in need of a bit of a help. The project involves (indirectly) interfacing a Nokia cell phone to the Launchpad, "listening" to one of the audio out channels (don't need the other one) and simulating control button presses. For this I need the phone to reliably recognize the interfacing circuitry as a "basic headset" (if using a non-conforming naive straight-through cable, my two test subjects, an E51 and an E90 are reliably unreliable at working with the manual accessory-type selection, and keep asking "what is this plugged in my @ss?" after every call). The actual circuit, when fitted with the speaker(s), the microphone and the control button is quite simple, the extensive specification of the detection process (Nokia AV hardware interface specification, with coinciding information here and here, among some other pinout sites) however suggests to me that the implementation must be quite strict, and everything matters. What I need basically is circuitry that has no speaker(s) or a microphone, but passes the detection as a "basic headset". Cannibalizing a HS-47 and using it for parts was also considered, but the result is very fragile both physically and in reliability (working with those litz wires is completely out of my league, also with the speakers and/or the mic cut off, the rest apparently doesn't pass detection). I have sort of been stamping in one spot with this for the past couple of days, so a couple of well-directed pushes are appreciated. Quote Link to post Share on other sites
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