I2C bus

[AlexLin]

Hi
I cannot find the I2C bus to connect a SX1509.Not on the schematics neither the HW drawing..I see the SPI busses but no I2C......for use with M260..

[dc42]

I assume you don't already have a DueX expansion board connected to the expansion connector. The TWI pins are labelled TWCK0 and TWD0 on the underside of the Duet.

[AlexLin]

Thanks... TWI is I2C...

[T3P3Tony]

@alexlin yeah atmel call the I2C bus the two wire interface (TWI). I guess because of something proprietary in I2C (which is Phillips I think).

[fma]

I also think that the TWI bus on ATMEL can do other that I²C.

[enix]

@dc42 does this mean that there can be one or the other and not both? I am considering i2c as a communication option as well, but would like to expand to add a Diamond Hotend later.

@dc42 said in I2C bus:

I assume you don't already have a DueX expansion board connected to the expansion connector. The TWI pins are labelled TWCK0 and TWD0 on the underside of the Duet.

[T3P3Tony]

@enix you can access the I2C bus pins from the Duex expansion header as well:

https://duet3d.dozuki.com/Wiki/Duex_wiring_diagrams