Hi, I'm using two P82B715 chips to try and communicate over a distance of 20m between an I2C sensor and the arduino. My prototype is based upon the following diagram: [image] I know that the Arduino has built in resistors, does this mean that the first set may be omitted, but the later sets not…

I2C Bus length extension - pull up resistors?

Headroom September 13, 2012, 5:27pm 3

Also the effect of pullup resistors on signal quality is not to be underestimated:

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