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Product SEN-09623 | about 9 months ago

Hi everyone,
I have used ITG3200 and ADXL345 break out (http://www.sparkfun.com/products/10121). I had a very good and stable reading on my old quad, and I was using complementary filter instead of Kalman filter. Right now, I am using the code provided (http://code.google.com/p/sf9domahrs/) and it fluctuate a lot when my motors are running fast. So I started using my own code for ADXL345 and I am not using Arduino IDE, I am using Code vision. My SDA is PORTC.4 and my SCL is PORTC.5. I send the 0xA6 which is the ADXL345 address and I don’t receive any ack.
My sensor is working fine with the code provided so it can’t be a hardware problem. Do you have any idea what I am missing?
thank you very much.