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Post: Hi Tony The easiest way to map the values to three buses would be to use a function which takes an input pin and state and uses a series of if statements to map it to the correct pin. The code below should do what you need. def update_output_pin(pin, state, bus2, bus4, bus6): ''' Update the output pin for busses 2, 4 and 6 based on an input value of 1 to 48 ''' if state is 0 or state is 1: if pin >= 1 and pin <= 16: bus2.write_pin(pin, state) elif pin >= 17 and pin <= 32: pinval = pin - 16 bus4.write_pin(pinval, state) elif pin >= 33 and pin <= 48: pinval = pin - 32 bus6.write_pin(pinval, state) else: print("pin out of range") else: print("state out of range") def main(): ''' Main program function ''' # Create 6 instances of the IOPi class with an I2C address of 0x20 to 0x25 iobus1 = IOPi(0x20) iobus2 = IOPi(0x21) iobus3 = IOPi(0x22) iobus4 = IOPi(0x23) iobus5 = IOPi(0x24) iobus6 = IOPi(0x25) # Busses 1, 3 and 5 will be inputs iobus1.set_port_direction(0, 0xFF) iobus1.set_port_direction(1, 0xFF) iobus3.set_port_direction(0, 0xFF) iobus3.set_port_direction(1, 0xFF) iobus5.set_port_direction(0, 0xFF) iobus5.set_port_direction(1, 0xFF) # Busses 2, 4 and 6 will be outputs with the pins initially set to 0 iobus2.set_port_direction(0, 0x00) iobus2.set_port_direction(1, 0x00) iobus2.write_port(0, 0x00) iobus2.write_port(1, 0x00) iobus4.set_port_direction(0, 0x00) iobus4.set_port_direction(1, 0x00) iobus4.write_port(0, 0x00) iobus4.write_port(1, 0x00) iobus6.set_port_direction(0, 0x00) iobus6.set_port_direction(1, 0x00) iobus6.write_port(0, 0x00) iobus6.write_port(1, 0x00) while True: # count to 48 and and set the pin state high for each pin in turn for val in range(1, 48): time.sleep(0.05) update_output_pin(val, 1, iobus2, iobus4, iobus6) # count to 48 and and set the pin state low for each pin in turn for val in range(1, 48): time.sleep(0.05) update_output_pin(val, 0, iobus2, iobus4, iobus6) if __name__ == "__main__": main() The [b]update_output_pin(pin, state, bus2, bus4, bus6)[/b] function takes the pin number between 1 and 48, the state and the three busses which will be used for outputs. In the main function, I created 6 instances of the IO Pi class with the i2c addresses 0x20 to 0x25 and set busses 1, 3 and 5 as inputs and 2, 4 and 6 as outputs. The while loop at the bottom contains some for loops that will switch each pin on in turn and then switch them off again in turn. In your program, you would replace the for loops with your code to read from the text file.