Go Down

Topic: i2c pull-up resistors: needed or superfluous? (Read 800 times) previous topic - next topic


Aug 19, 2008, 12:08 pm Last Edit: Aug 19, 2008, 12:13 pm by msx Reason: 1
Ok, as i wrote in the previous post i'm trying to use an i2c lcd with arduino diecimila, without success.
One thing i noticed is that, altough it is stated all around that the atmega168 has internal pull-up resistors, almost everybody uses extra external resistors.
So are they needed or not? I would try it but don't have resistors at hand..

(Edit: sorry it was ment for hardware/interfacing)


I had one bus of 4 sensors, total length nearly 3 feet, and did not use external pullups.  It worked no problems.

A particular peripheral, or a bus with lots of peripherals, or a long bus could require external pullups, but in my limited experience I haven't needed them yet.


Go Up

Please enter a valid email to subscribe

Confirm your email address

We need to confirm your email address.
To complete the subscription, please click the link in the email we just sent you.

Thank you for subscribing!

via Egeo 16
Torino, 10131