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Post: Hi Zsombor The easiest way to do what you want would be to read the ADC value into a variable using the read_adc_voltage() function and write the variable to the DAC using the set_dac_voltage() function. The code below reads a value from the ADC channel 1 and writes it to the DAC channel 1. [pre][code]#!/usr/bin/env python import time import ExpanderPi def main(): ''' Main program function ''' adc = ExpanderPi.ADC() # create an instance of the ADC dac = ExpanderPi.DAC(2) # create an instance of the DAC with the gain set to 2 so the maximum voltage is 4.095V # set the ADC reference voltage. this should be set to the exact voltage adc.set_adc_refvoltage(4.096) print("Updating DAC from ADC") while True: # read the adc voltage on channel 1 to a variable involt = adc.read_adc_voltage(1, 0) # write the variable to the dac on channel 1 dac.set_dac_voltage(1, involt) time.sleep(0.1) if __name__ == "__main__": main()[/code][/pre] The ADC voltage reference is set to a value of 4.096 which should match the voltage of the reference on the Expander Pi. The DAC is set to use a gain of 2 which gives it a voltage range of 0 to 4.095V. This allows the DAC to have the same voltage range as the ADC so any voltage between 0 and 4.095V on the ADC input will be sent to the DAC output. A variable called involt is used to store the value from the ADC before writing it to the DAC. I hope this helps you with your problem.