Devices with same addresses can't be on a same bus. Usually such ics have an for variable slave addresses by changing the last 3 bits of the 7 bit address. That gives you the option for 2^3 = 8 slave devices. This is true for port expanders like pc8574 and its likes.

I don't believe there is a way to target a specific pin without also writing to the rest of the pins on the port. The safe way to be sure you are changing only one pin would be to first read the value of IODIR, change the individual bit for the pin you want to change in that byte, and then write the byte back to IODIR

Yes, although many manufacturers make this type of chip so you might not find this exact component

@@getnlab So if we are using this with a 5V lcd display do we power the display with 5v and this chip with 3.3 v (assuming connected to a pic32 i2c master)? Thanks for posting this.

that's how a binary number is denoted, you'll notice in other parts of the video that he wrote "0x00" the 0x denotes a hexadecimal number.

@@nicholascopsey4807 Thanks for the answer!