Go Down

Topic: Yet another I2C not working experince... (Read 383 times) previous topic - next topic


May 05, 2014, 09:20 am Last Edit: May 13, 2014, 11:47 am by bostDK Reason: 1
Hi there,
I have same problem as several others have reported:  I2C seems not to be working correctly. I'm trying to get the pololu MinIMU-9 v2 connected to the primary I2C pin 20/21 to work. Running the sample application from pololu  works flawless on an MEGA (github.com/pololu/l3g-arduino).  On the DUE something is blocking in the communication and the SDA line is pulled low and left in this state.  The MinIMU-9 v2 is 3.3/5 volt compliant (built in level converters) so I don't thing I is an electrical issue.  The strange part is, that the SDA line is permantly held low after the first communication approach, and stays there.
I'm using a 20x4 I2C LCD on SDA1/SCL1 with no problems - apart from the external applied pull up resisters. I don't have analyzing tools for debugging the I2C so I really  don't  know where the communication stops/hangs- only oscilloscope available.
I found another thread with similar issue and (http://forum.arduino.cc/index.php?topic=217442.0) tried the alternative  wire.cpp with no luck. I'm kind of stuck with this problem
- Bo

Edit - Seems to be hardware related... The 2 x 1.5 Kohm is to low for the pololu MinIMU-9 v2. Must find a way to replace with 4,7 K or higher values. The thing is, that the wire(?) lib stop with SDA line pulled low, and i don't know why. Must bee somthing with ack or similar.....

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