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Post: The problem could be that the ADC is set in the wrong mode. The ADC used on the expander pi can be used as 8 single-ended inputs or differential pairs with pins 1 and 2, 3 and 4, 5 and 6 and 7 and 8 making up the four differential inputs. If the ADC has been set to be in differential mode then it would be trying to measure the difference between the input pins instead of measuring relative to ground which would explain the problem you are having. Are you using [url=https://github.com/abelectronicsuk/ABElectronics_Python_Libraries/tree/master/ExpanderPi]our python library[/url] for reading from the ADC? If so then you should be able to set the inputs to single-ended mode by using read_adc_voltage(channel, 0). The second parameter on the read_adc_voltage function sets the mode for the inputs with 0 being single-ended and 1 being differential. Setting the parameter to 0 should hopefully solve the problem.