Sorry for skipping this detail. I have HMC6352.

Just would like to clarify a bit ...
 
I have SVS and the label on both cameras says:
COMedia LTD
OV9655AA
0735
 
Is it the same as OV7725 camera? Should I just detach left camera’s module and proceed with I2C address changing?

OK, sound good.
 
So, this means that I need to change address to 0x22 (44) in the case if I want to use '$C' command or I may keep default 0x21 (42) if I am fine using 'iRab' command. Am I right? What is the difference between these two approaches? Is '$C' command is just a shortcut for the 'iRab' command with correctly set device ID and register? Any difference in output?

Quote from admin on 12/01/09 at 6:40am:

The '$C' seems to provide output in degrees. But 'iR ..' will gives "the value in tenths of degrees from zero to 3599" as it  is said in HMC6352 data. So it looks like '$C' just divides output from sensor by 10.
 
Unfortunately so far was unable to get nice results with the sensor. Rotating it by 90 degrees gives little change in many cases. And vice versa - sometimes small change is done, but output differs a lot. Will need to struggle a bit more with it ...

My last tests were done when motors are not connected at all. I even removed them away from SVS board.
 
But, it is clear that it is close to impossible to build a robot with such constraints. Most robots look like wheeled cars (or with tracks), bipeds, quadrupeds or hexapods – they are full of motors and servos. Even if we have only 2 motors for moving base, we may also have pan/tilt setup for camera. And there is no sense in creating very big moving base just with single purpose – put motors on one end and compass on another end, so there is enough space between.
 
Not really sure if shielding will help – did not try it yet. But anyway, if the robots has not only motors, but also servos for pant/tilt plus something else, then what to do? Shield everything?
 
With best regards
Andrew

Quote from admin on 03/04/08 at 9:49am:

 
Why is it so? Why 0x42 should be converted to ox21? And what is the conversion rule?
 
With best regards
Andrew

Question about the i2c HMC6352 compass...
 
Earlier this month I was working with the compass and it was working beautifully. Now when I connect the compass and turn on the blackfin, all three LEDs come on, like it is booting, but they LED1 never turns off. I can connect to it through Tera Term and press 'V' and nothing happens. But while the blackfin is still on, I disconnect the compass and #f [Version info] displays and the output from the boot sequence is displayed and everything works. But when i reconnect the compass, everything stops working again...
 
Any ideas would be greatly appreciated.