On Sat, Nov 22, 2008 at 11:46 AM, Al Johnson <[EMAIL PROTECTED]> wrote: > On Friday 21 November 2008, Alessandro Sappia wrote: >> Hi >> Me and some friends wants to connect the freerunner to some kind of sensor. >> We saw that the debug connector give us the SPI bus. >> is it a good choice ? > > It has been suggested in the past. I don't know if anyone's actually tried it > yet though.
which ones are the connection used in some other projects ? I wasn't able to fount any project involving some hardware extension. >> is there a point where to take power near there (the debug connector >> doesn't export it... > > R4701 and R4702 next to the debug connector have one end on the IO 3.3V line, > but may not be a good place to pull power from. R7802 on the other side of > the speaker has the 3.3V supply for the accelerometer which may be better. It > probably depends on your power supply requirements though. > > I assume you've found the schematics: > http://downloads.openmoko.org/schematics/GTA02/ > Yes, we have the schematics, but we really miss a good hardware hacker between us :) the 3.3V supply seems fine. le'ts give it a try. we have to give power to an OPAMP. I didn't check if the soundcard is easily reachable, but we may substitute the ADC on the external sensor with it (opamps are always needed to get a bigger signal). > _______________________________________________ > hardware mailing list > [email protected] > http://lists.openmoko.org/mailman/listinfo/hardware > -- Alessandro Sappia [EMAIL PROTECTED] _______________________________________________ hardware mailing list [email protected] http://lists.openmoko.org/mailman/listinfo/hardware
