Computer controlled OTA TV antenna.

Step 10: Extra video card i2c.

You will need a vga breakout cable: http://www.instructables.com/id/Vga-breakout-cable/ or equivalent

Setting up the software:

$ sudo yum install i2c-tools i2c-tools-eepromer

$ modprobe i2c-dev

$ i2cdetect -l
i2c-0 unknown    nouveau-0000:01:00.0-0           N/A
i2c-1 unknown    nouveau-0000:01:00.0-1           N/A
i2c-2 unknown    nouveau-0000:01:00.0-2           N/A
i2c-3 unknown    SMBus nForce2 adapter at 5000    N/A
i2c-4 unknown    SMBus nForce2 adapter at 5100    N/A

Good basic way to see whether it is working.

$ sudo i2cdump -r 0x60-0x68 -y 0 0x50 b
[sudo] password for eddie:
     0  1  2  3  4  5  6  7  8  9  a  b  c  d  e  f    0123456789abcdef
60: 45 4c 4c 20 4d 37 37 30 0a                         ELL M770?

$ sudo i2cdump -r 0x5f-0x68 -y 0 0x50 b
     0  1  2  3  4  5  6  7  8  9  a  b  c  d  e  f    0123456789abcdef
50:                                              44                   D
60: 45 4c 4c 20 4d 37 37 30 0a                         ELL M770?


Seen some variations that use a y-cable for the vga connection. Think I have a Y-cable somewhere. Looking for it.  We were using the s-video port so the vga port would be left free. may still try that. Cut a vga cable from a dead monitor to use for the interfacing.

Also see:
http://www.paintyourdragon.com/?p=43

One place to get an i2c compass: (Think I purchased mine from Jameco)..
https://www.sparkfun.com/products/7915