As a test, I wanted to see if I could use the GPIO I2C pins (3 and 5) to communicate with an Arduino Uno. The idea is to send numbers back and forth between them with smbus in Python on the TX1 side.
However, even with the arduino sketch running http://blog.oscarliang.net/raspberry-pi-arduino-connected-i2c/ (the arduino part) before using i2cdetect -y 0, I can’t see anything at all. None of the i2c buses seem to be seeing anything on the Tegra.
Am I doing something wrong here?