#include <Wire.h>
#include <MCP23017.h>

#define MCP23017_ADDR 0x20
MCP23017 mcp = MCP23017(MCP23017_ADDR);
int counter = 8;

void setup() {
  Wire.begin();
  mcp.init();
}

void loop() {
  if(counter == 16){
    counter = 0;
  }

  uint8_t value = mcp.digitalRead(counter);
  if(value == HIGH){
    mcp.digitalWrite(counter,LOW);
  }else{
    mcp.digitalWrite(counter,HIGH);
  }
  
  counter++;
  delay(500);
}