On Sat, Sep 06, 2008 at 05:40:28PM +0100, Alberto Morales wrote: > Hello, > > Nokia HS-40 is a cheap mono headset that has a 2.5mm jack with 4 rings. > It costs 9 EUR in spain. The pinout is INCOMPATIBLE with OM, hence nokia > pinouts are incompatible with OM. Here it is the Nokia HS-40 pinout: > > Nokia HS-40 pinout: > 1 (tip) - left (R=34 ohm to ground) > 2 - unused (in stereo models, probably connects right) > 3 - mic (mic resistance 1K1 to ground, if button is pressed 48R) > 4 (base) - ground > > From this message, here it is the OM pinout: > http://lists.openmoko.org/pipermail/community/2008-March/013792.html > > Openmoko pinout: > 1 (tip) - mic (2K2 ohm and 0R if button is pressed) > 2 - right > 3 - left > 4 (base) - ground > > If we plug the headset in the OM, only one speaker would work (i never > did it). This was reported by David Pottage in this message: > http://lists.openmoko.org/pipermail/community/2008-August/028219.html > > I stopped measuring and began hacking ;-) The little box which has the > mic and the button, has two screws. If you remove them and open the > case, you'll see 3 wires + 1 wire shielding coming from the jack. It > should be 4 wires + shield, but nokia removed the unused wire from right > speaker. Get a multimeter and find the wires that connect with pin 1 and > 3 of the jack. Take a solder iron and swap wires from 1 and 3, and you > have a headset with a pinout compatible with OM. > > I plugged the headset in the GTA02 and loaded the gsmheadset.state > during a call. I only had to increase the gain of the output from 80% to > 95% because the output from speaker was very low. 34R is below the 40R > minimum impedance that joerg recommended in his message. Microphone is > ok and people heard me fine. GSM buzz from > https://docs.openmoko.org/trac/ticket/883 is still randomly heard by the > other end (slight in local). > > Button doesn't activate anything in the GTA02. I don't know if it > should. The 48R smd resistance can be easily transformed into a > shorcircuit if needed. > > I have a few photos, i could create a nokia headsets section in the wiki > if you think is useful.
Yes, please do it, including photos :) It's much better that it resides in the wiki than here! Please tell us the URL when you're done :) Congratulations, Rui -- Grudnuk demand sustenance! Today is Prickle-Prickle, the 30th day of Bureaucracy in the YOLD 3174 + No matter how much you do, you never do enough -- unknown + Whatever you do will be insignificant, | but it is very important that you do it -- Gandhi + So let's do it...? _______________________________________________ Openmoko community mailing list [email protected] http://lists.openmoko.org/mailman/listinfo/community
