HiLetgo 2pcs PCF8574 PCF8574T IO Expansion Board I/O Expander I2C Evaluation Develop Module

picea 85-74 GPIO expander breakout module 8 GPIO p 0 through 7 and interrupt out for detecting when and input changes and 3 address jumpers a 0 1 & 2 with high and low positions I have two of these GPIO expanders plugged into each other sharing the power ground and serial clock and data each one with a different address and I am using all 8 bits on each one to control 16 LEDs in a sequential light chaser I'm using an Arduino Uno with the I squared C outputs I'm using input a 2 as an interrupt in just from one of the modules and I'm taking power and ground as well as clock and data into the headers in order to make the connections a lot simpler I'm only using one resistor to VCC because I'm only mostly turning on one LED at a time and this is a lot easier to handle so I'm tapping into one of the headers to take VCC and send it in to the breadboards power strip the anodes are all going to