Re: Is anyone working with I2C or SMBus devices for HA?

[nobody@xxxxxxxxxxxx (Dave Houston)]

See the first FAQ question at...

     http://www.esacademy.com/faq/i2c/
     http://www.esacademy.com/faq/i2c/q_and_a/faq/i2cqa1.htm

"Robert Green" <ROBERT_GREEN1963@xxxxxxxxx> wrote:

>My new PC motherboard comes with an I2C pin header.  I would think this
>connector would have remarkable extensivity in the HA world since it is
>widely used to monitor the "health" of the PC by reporting fan RPM, power
>supply voltages, case and CPU temperatures, etc.
>
>Has anyone out there done something like this already?  My preliminary
>Google search has so far come up blank.  There was some discussion of it in
>the past:
>
>http://groups.google.com/group/comp.home.automation/browse_frm/thread/449b44
>d7b643ae73/d106a8e141a6676b?lnk=st&q=SMBus+home+automation&rnum=2#d106a8e141
>a6676b
>
>Phillips has a lot of appnotes that look a lot like things that would be HA
>adaptable at:
>
>http://www.semiconductors.philips.com/catalog/282/50808/41735/index.html#417
>35
>
> I2C/SMBus - [82] -  -
>  A/D and D/A converters - [1] -  -
>  I²C bus buffers - [9] -  -
>  I²C bus controllers - [3] -  -
>  I²C bus repeaters/hubs/extenders - [9] -  -
>  I²C DIP switch - [4] -  -
>  I²C general purpose I/O - [16] -  -
>  I²C LED display control - [10] -  -
>  I²C multiplexers/switches - [9] -  -
>  I²C serial EEPROM/RAM - [10] -  -
>  I²C temperature/voltage monitors - [7] -  -
>  I²C voltage level translators - [4] -  -
>
>OK - never mind!  I narrowed down the search and discovered that Mike
>Baptiste answered this question, previously posed here in 2000/11/14:
>
>"I'd stick with RS-485.  Much easier to use/design in, lots of silicon
>available, including ESD hardened chips, long distances (up to 4000'),
>and much higher speeds than you'll ever see in I2C."
>
>http://groups.google.com/group/comp.home.automation/browse_frm/thread/9dc04f
>f9a645a24/ce25f40d10ab45bc?q=i2c&rnum=1#ce25f40d10ab45bc
>
>Has anything changed in the last six(!) years?