Slowing I2C to allow for extended distance

Farmer Scott

Anyone ever tried slowing I2C frequencies to allow for longer distance communication?· I'm not exactly sure how fast the Propeller drives communication using the I2C object, but I can't help but wonder if slowing it would allow for longer distance communication for a sensor network.

Anyone tried this?· If so, what was the result?

I'm considering giving it a try, probably just using the I2C object and leaving the clock line states either high or low for longer periods of time.

Maybe not the best forum, but since I'll be working on propeller, I figured you guys might have some insight...

Thanks,

Scott

Leon

I doubt if it would help. Pulse rise and fall time degradation would be the main cause of problems and they aren't related to speed.

Leon

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Post Edited (Leon) : 6/3/2008 4:40:53 PM GMT

Mike Green

I2C is just not designed for communications over distances more than a few feet. RS485 signal levels with some kind of network protocol would work. Dallas' 1-Wire protocol is designed for distances over 100's to 1000's of feet with appropriate design (see Dallas' application notes).