digital compass modules

Nils Faerber nils.faerber at
Wed Jan 23 12:07:12 CET 2008

joerg schrieb:
> Am Mi  23. Januar 2008 schrieb Schmidt András:
>> Hi!
>> A compass module would be very nice with many applications!
>> I have no hardware related experince. Is it possible to integrate a chip
>> like this into the phone? How would you do that?
> True drop-in solution
> Simple I2C interface 
> 2.7 to 5.2V supply range
> Supply current : 1mA @ 3V
> I2C is a bus, what means you should be able to simply tap the 2 wires of the 
> existing I2C and connect to the chip(pin 7, 10). Another 2 wires for power 
> (pin 5, 14) - 1 mA is pretty low consumption - and some birds food (Ca, Cb) 
> and a drop of cyanide glue to stick the chip somewhere well away from 
> magnetic interference (metal and "high" electric current). That's it. Some 
> driver to read out the chip for the ones who like it the pretty way.. ;-)

I doubt that such a device would work in the phone, sorry.
The GTA01 contains three loadspeakers with magnets, AFAIK GTA02 will
still contain at least two. Then there is massive EM radiation from the
GSM antenna which will interfere and finally there is the Bluetooth
module also emitting EM when used.
Earth's magnetic field is very weak so almost *any* EM radiation near to
the measuring device (the chip) will interfere.

  nils faerber

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