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Post: Hi Chuck I am sorry you are having problems with your ADC Differential Pi boards. You can use the i2cdetect command to check if the ADC chips are visible on the I2C bus. Run the command "[b]sudo i2cdetect -y 1[/b]" in a terminal and it should display a grid with the i2c addresses of any devices available shown in the grid. The ADC chips on the ADC Differential Pi are normally set to addresses 0x68 and 0x69 but depending on how the address jumpers are set it can be any address between 0x68 and 0x6F. If the ADC chips show up in i2cdetect that would mean the problem is most likely a software issue. If the ADC chips do not show up in i2cdetect it is probably a hardware issue. The fact that your ADC Pi works would suggest that there isn't a problem with the I2C bus so the hardware issue would most likely be with the ADC Differential Pi. Is the current shunt you are measuring connected to the high side or the low side of the circuit? Ideally, you want to connect the shunt on the low side so the voltage measured by the ADC is relative to ground. The maximum input voltage on the MCP3424 ADC used on the ADC Differential Pi is 5V. A high side current shunt on a circuit with a power supply voltage greater than 5V would overload the ADC as the input voltage on the ADC relative to ground would be greater than 5V.