Hi, the Relay Shield 3.0 says that it uses SCL, SDA, IOREF and NC as Update Pins.
Does this mean that SCL and SDA are not availible for my I2C display?
What does an Update Pin do on a relay board?
Looking at the pictures of the board it is unlikely that these pins are used by the relais shield. I see no component that would support a I2C protocol, and the relais themselves are controlled by the pins 4,5,6 and 7.