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Post: Hi, I think I can see where you are going wrong with your code. Bit 7 of the config byte, which is the last byte returned, is the Ready Bit which the ADC uses to show when a sample is ready to be used. To initiate a new read on the ADC you have to set the Ready Bit to 1 in the config and write that to the ADC. You then have to keep reading from the ADC until the ready bit returns as 0. When it is 0 that means the last set of bytes you read from the ADC contains the new voltage value. [url=/docs/pdf/mcp3424.pdf]Page 17 of the MCP3424 datasheet[/url] describes how the ready bit works in more detail. If you look at the [url=https://github.com/abelectronicsuk/ABElectronics_Python_Libraries/blob/master/ADCPi/ADCPi.py]python library[/url] from lines 141 to 154 you can see that there is a while loop which reads the bytes from the ADC and then checks the status of bit 7 in the config byte. The while loop only breaks when bit 7 is returned as 0. Hopefully, if you add this while loop into your java code it will return the correct values.