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anthrolume

Member Since 18 Apr 2011
Offline Last Active May 21 2011 02:09 AM

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I2C buss works on Arduino, not on Netduino

20 April 2011 - 11:03 PM

I'm working on a project with a pretty long I2C buss, containing 50 slave devices.

The buss works great when controlled by an Arduino Uno.

When I hook the same buss up to my Netduino Plus, the bus won't work at all. If I remove about 15 slaves, it starts working.

I was using 2.2K pull-up resistors on the I2C clock and data lines. I also tried using 820 ohms, but there was no change in behavior. I also tried supplementing the Netduino's power through the barrel jack, and powering the I2C buss separately from the Netduino. Neither of those ideas helped.

Can anyone think of a reason why the same physical I2C setup would work on an Arduino, but no on a Netduino?

Here's the buss in question:
Posted Image