ADC Pi Input Voltage Calculator

ADC wiring

The ADC Pi Plus and ADC Pi Zero use resistor voltage dividers on each input using  10k and 6K8 values to reduce inputs down to a voltage suitable for the ADC chip. By default the input voltage can be a maximum of 5.06V but this can be increased by adding a resistor in series with the input as shown on the illustration.

This tool calculates the resistance for R1 and a multiplier required for our ADC Pi code libraries. You can use this calculator to increase the voltage range of the ADC Pi Plus and ADC Pi Zero.

5V to 100V

Calculate Values

R1 Resistance = 0

Voltage Multiplier = 0


Nearest E48 Resistor Value

R1 = 0

Maximum Input Voltage = 0

Voltage Multiplier = 0