I have an Arduino and an Adafruit data logger shield.
I want to log the data from this IMU sensor: http://viacopter.eu/index.php?page=shop.product_details&flypage=flypage.tpl&product_id=64&category_id=11&option=com_virtuemart&Itemid=53
The sensor has to be connected to the 5v power supply on the Arduino board and the i2c lines are operating at 3.3v.
The i2c lines from the RTC on the data logger shield are operating at 5v because of the pull up resistors R1 and R2 in this schematics:http://www.ladyada.net/make/logshield/design.html
Because the sensor already has internal pull up resistors, I removed the R1 and R2 pull up resistors of the shield.
When I connect the logger and the sensor to the Arduino, they aren't working correctly.
Both the logger shield and the sensor are working nice when I connect them separately.
Maybe the problem is that the shield also uses the 5v power supply on the Arduino.
I don't fully understand the schematics of the shield, but it seems the shield is using the 5v power supply from the Arduino.
Is this true?
If not, what am I doing wrong?
Thanks in advance!