Is manually modprobing i2c_bcm2708 a recent requirement? I haven't used i2c for several days on the Pi and tried using it today. Thought it must be broken when I didn't get the expected devices.Serac wrote:Did you load the i2c_bcm2708 kernel module along with the usual i2c core drivers ?
It would only be a problem if the external i2c device has bus pull ups fitted that are connected to 5V. There is no need for external devices to have pull ups fitted as the PI has them fitted, and they are connected to 3V3 not 5V.joan wrote: CONNECT AT YOUR OWN RISK. I would try connecting pin 2(5V) to VIN rather than pin 1(3V) to 3V0. However posters suggest that a 5V I2C interface will damage the Pi itself via (presumably) SDA/SCL.