Legal Removal Request

Post: Hi TonyE The simplest way to do this with an IO Pi Plus would be to connect the buttons to the bus on one chip and the LEDs to the bus on the second chip with the led pins matching the button pins, so Button 1 connects to bus 1 pin 1 while LED 1 connects to bus 2 pin 1. You can then use a loop to read the values from the two ports on bus 1 and write them to the ports on bus 2. For each button, you will need to connect the input to the button to 5V and the output to bus 1 on the IO Pi. You may also need a pull-down resistor connected between the button output and ground to make sure the voltage drops to 0V when the button is released. A 10K resistor should do the job. Without a pull-down resistor the input on the IO Pi Plus would be floating which means if there is any stray capacitance in the wire it could cause the input to be read as high or low. The code below should do what you need. from ABE_helpers import ABEHelpers from ABE_IoPi import IoPi i2c_helper = ABEHelpers() i2c_bus = i2c_helper.get_smbus() # create the two buses bus1 = IoPi(i2c_bus, 0x20) bus2 = IoPi(i2c_bus, 0x21) # set bus 1 to be inputs bus1.set_port_direction(0, 0xFF) bus1.set_port_direction(1, 0xFF) # set bus 2 to be outputs and turn all of the pins off bus2.set_port_direction(0, 0x00) bus2.set_port_direction(1, 0x00) bus2.write_port(0, 0x00) bus2.write_port(1, 0x00) port0val = 0x00 port1val = 0x00 while True: port0val = bus1.read_port(0) port1val = bus1.read_port(1) bus2.write_port(0, port0val) bus2.write_port(1, port1val)