#include <Arduino.h>
#include <PCF8574.h>

PCF8574 inputbank1(0x21);

void setup() {
    Wire.begin(14,33);
    Serial.begin(9600);
    boolean connected = inputbank1.begin();
    Serial.println("connection state = "+String(connected));
    inputbank1.write(0, HIGH);
    delay(50);
    inputbank1.write(1, HIGH);
    delay(50);
}

void loop() {
    for(int i=2;i<8;i++) {
        Serial.println(inputbank1.read(i));
        delay(100);
    }
}