Hello, I have strange trouble with my arduino mega. I'm trying to connect I2C gyroscope and I2C IMU to it, but wire.transmit() hangs. I connected same gyro to my arduino uno and run same programm and gyro worked. Yes I connected right: 21-SCL;20-SDA. What it can be?

Mistery: I2C not working, blink working

CrossRoads November 16, 2012, 9:09pm 2

missing 4.7K pullup resistors?
mixing 3.3V and 5V parts?
bad addresses to the devices?

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