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Post: Hi If you run "sudo i2cdetect -y 1" do you see the two ADCs on addresses 0x68 and 0x69? If the ADCs are not showing up try going through the steps in our [url=/kb/article/1/i2c-part-2-enabling-i2c-on-the-raspberry-pi]i2c tutorial[/url] to make sure I2C is enabled and working. You could also check the solder joints on the GPIO header to ensure there are no dry joints or bridges between the pins. If the ADCs do appear in i2cdetect that means that the ADCs are working and the problem is somwhere else in the circuit. Are you using our [url=https://github.com/abelectronicsuk/ABElectronics_Python_Libraries/tree/master/ADCPi"]Python library[/url] or one of the other programming languages to communicate with the ADC Pi? Try connecting your input to each of the 8 ADC channels in turn, that will tell you if the problem is with one of the ADC chips. Channels 1 to 4 are on the ADC on I2C channel 0x68 and channels 5 to 8 are on address 0x69. You could also try measuring the input pad and ground pad on the ADC Pi with a multimeter to check if the voltage from your input is getting to the ADC Pi.