Re: [PLUG] I2C Bus Length

[Will <staticphantom@gmail.com>]

20 to 50 ft is an acceptable distance for I2C. When in doubt just lower the value of the resistors used to pull up the voltage on the bus to about 1k for longer wire runs. When doing longer runs, consider shielding the wires to reduce outside interference.

If you want to extend your distance for I2C, there are tricks where the data lines can run through a differential transceiver and the clock line goes through some tristate buffer but that is a bit much for most people.

-Will C

On Jan 12, 2014 7:55 AM, "Casey Bralla" <MailList@nerdworld.org> wrote:

I'm thinking about hooking up a temperature/humidity sensor to my Raspberry Pi. This sensor, looks like it would be easy to interface. However, the sensor comes with a 20-inch cable, and I'd like to have the sensor about 6 - 10 feet from the Pi.

 

I've never used the I2C bus before. Anybody have any ideas about the practical max distance from the Pi to the sensor?

--

 

Casey Bralla

 

Chief Nerd in Residence

The NerdWorld Organisation

 

www.NerdWorld.org

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