For DAC I2C communication on Arduino Uno, pins A4 and A5 are used as SDA/SCL.
However, for Arduino Mega, those pins are not linked to SDA/SCL. Therefore the I2C communication between the base board and the shield fails.
In case a rev 02 is made, DAC I2C communication shall be directly connected to SCL/SDA ports (next to digital inputs).
This should allow the shield to work on both the Uno and the Mega.
For DAC I2C communication on Arduino Uno, pins A4 and A5 are used as SDA/SCL.
However, for Arduino Mega, those pins are not linked to SDA/SCL. Therefore the I2C communication between the base board and the shield fails.
In case a rev 02 is made, DAC I2C communication shall be directly connected to SCL/SDA ports (next to digital inputs). This should allow the shield to work on both the Uno and the Mega.