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Post: Hello Camille I am not sure what the extra 0F value is for. I can't find any mention of it in the datasheet so it should be safe to ignore it and use the other three bytes. For converting the two bytes into a voltage we use the following code which can be found in the [url=https://github.com/abelectronicsuk/ABElectronics_C_Libraries/blob/master/ADCPi/ABE_ADCPi.c]read_voltage function in our C library[/url]. double gain = (double) pga / 2; double lsb = 0.00003125; double voltage = ((double)raw * (lsb / gain)) * 2.471; pga is the gain value so in your case, it would be 1. The lsb value changes depending on the bit rate, there is a list of the different lsb values in our C library. The 2.471 is the value for the voltage divider we use on the ADC Pi Plus to drop the 5V inputs down to 2.048V. One thing to consider when measuring the voltage on the ADC Pi with an oscilloscope is the scope probe may have a 50R impedance which when connected to the voltage divider on the ADC could change the resistance of one of the resistors which would alter the voltage being read by the ADC. It may be worth measuring the voltage with a high-impedance probe or using a multimeter.