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Post: Hello, I'm trying to read voltage values on several channels of the ADC Pi Plus, i'm using the 16 bits resolution, continuous mode, and 1x multiplier. I am using a Raspberry Pi 3 b I first write into the configuration register, for channel 2 i send : 1011 1000 (0xB8) according to the datasheet i should be receiving "2 data bytes followed by the configuration byte repeated for each clock sent" I send a 'read' command specifying that i want 4 bytes returned, the answer is : 0F 52 38 B8 52 38 is the measured voltage B8 is the command i sent but what is the '0F' ?? This extra byte is here for every channel, its value is 00 for channel 1 and 3, and 0F for channel 2 and 4. Now, about the reference voltage. I read in the datasheet that the internal reference voltage is 2.048 V. In order to calculate the voltage measured i arrange the bits to be in the correct order, then : (value measured) * (( Vref * 2)/ (2^16)) as specified in the datasheet i end up with a voltage of 0.46V , but measuring with an oscilloscope gives me 0.6V The card is powered by 5V, is it this value i am supposed to use instead of the internal one ? It gives me results closer to what i was able to measure with the oscilloscope... Thanks for any help given, Camille