If the input voltage is higher then the bit is one, otherwise The output of the DAC forms the high bit of the result (stored in a shift

The DAC voltage is the fed into a comparator. Half of the Vref voltage, by using a DAC to generate half the reference It first checks whether the input voltage is higher or lower than Same voltage is measured throughout the conversion process. The sample and holdĬharged to the input voltage and then the input disconnected so that the The Vref voltage using a divide by two sequence. The ADC converter compares the input analogue voltage to a portion of This ADC is known as a successive approximation ADC and requires several clock cycles to zoom in on the correct ADC output. This is the wrongĮquation to use and means there is an offset added to all values. The reason that you will see the wrong equation on the web is so that '0x000 represents analog ground, and 0x3FF represents the selected reference voltage minus one Note however that the maximum ADC value is 1023 so the maximum ADC value that can ever be reported is: So for Vref=5V, an ADC value of 1 would result in a Voltage step ofĤ.88mV - the value of voltage for one LSB - this is the Arduino ADC However the ATMega328P datasheet gives the following formula: There is always some confusion about whether to divide by 1024 or 1023

The Arduino ADC has a 10 bit converter, and that means there areġ024 distinct values that can be returned as a result from the ADC: for 5V operation and 125kHz ADC sampling clock (See below). 40☌ ~ 85☌ for 4V operation and 200kHz ADC sampling clock. 10 bit Absolute Accuracy (Including INL, DNL,

Arduino uno datasheet