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Post: Hello To read from four ADC chips on two ADC Pi boards you will need to create two instances of the ADCPi() class with the first instance using the two addresses on the first board and the second instance using the addresses on the second board. The code below is a modified version of the read voltage demo from the ADC Pi python library and I have added a second instance for the ADCPi class with addresses 0x6A and 0x6B. Hopefully, you can use this code to modify your own project. [pre][code]#!/usr/bin/env python from __future__ import absolute_import, division, print_function, \ unicode_literals import time import os try: from ADCPi import ADCPi except ImportError: print("Failed to import ADCPi from python system path") print("Importing from parent folder instead") try: import sys sys.path.append('..') from ADCPi import ADCPi except ImportError: raise ImportError( "Failed to import library from parent folder") def main(): ''' Main program function ''' adc1 = ADCPi(0x68, 0x69, 12) adc2 = ADCPi(0x6A, 0x6B, 12) while True: # clear the console os.system('clear') # read from adc channels on the first ADC Pi board and print to screen print("Board 1 Channel 1: %02f" % adc1.read_voltage(1)) print("Board 1 Channel 2: %02f" % adc1.read_voltage(2)) print("Board 1 Channel 3: %02f" % adc1.read_voltage(3)) print("Board 1 Channel 4: %02f" % adc1.read_voltage(4)) print("Board 1 Channel 5: %02f" % adc1.read_voltage(5)) print("Board 1 Channel 6: %02f" % adc1.read_voltage(6)) print("Board 1 Channel 7: %02f" % adc1.read_voltage(7)) print("Board 1 Channel 8: %02f" % adc1.read_voltage(8)) # read from adc channels on the second ADC Pi board and print to screen print("Board 2 Channel 1: %02f" % adc2.read_voltage(1)) print("Board 2 Channel 2: %02f" % adc2.read_voltage(2)) print("Board 2 Channel 3: %02f" % adc2.read_voltage(3)) print("Board 2 Channel 4: %02f" % adc2.read_voltage(4)) print("Board 2 Channel 5: %02f" % adc2.read_voltage(5)) print("Board 2 Channel 6: %02f" % adc2.read_voltage(6)) print("Board 2 Channel 7: %02f" % adc2.read_voltage(7)) print("Board 2 Channel 8: %02f" % adc2.read_voltage(8)) # wait 0.2 seconds before reading the pins again time.sleep(0.2) if __name__ == "__main__": main()[/code][/pre] To post code on this forum there is an "Insert Code Snippet" button on the message box, the fourth icon from the right, which should show a popup window where you can paste your code. When you press OK it should put the code in the message, formatted properly to look like a code snippet.