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Post: Hi The error you are getting normally means the I2C bus is not configured correctly. Can you try going through our [url=/kb/article/1/i2c-part-2-enabling-i2c-on-the-raspberry-pi]I2C tutorial[/url] to set up the I2C bus on the Raspberry Pi? Once you have gone through the tutorial try running the command "[b]sudo i2cdetect -y 1[/b]". It should list all of the I2C devices that are visible to the Raspberry Pi, the ADC Pi should be on 0x68 and 0x69. If it is showing up then you should be able to use the ADC Pi with our software libraries. If it is not showing up then check the solder joints on the 40-pin GPIO connector and the address header to make sure there are no dry joints or solder bridges.