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#include <PCF8574.h>


template <uint8_t ADDRESS=0x20>
class PCF8574_WindDir {
  private:
  PCF8574 pcf8574;
  public:
    PCF8574_WindDir () : pcf8574(ADDRESS) {}

    void init () {
      for (uint8_t i = 0; i < 8; i++) 
        pcf8574.pinMode(i, INPUT);
        
      pcf8574.begin();  

    }

    uint8_t winddirValue(bool asIndex = false) {
      PCF8574::DigitalInput state = pcf8574.digitalReadAll();

      if (state.p0) return asIndex ? 0 : 0;
      if (state.p1) return asIndex ? 1 : 15;
      if (state.p2) return asIndex ? 2 : 30;
      if (state.p3) return asIndex ? 3 : 45;
      if (state.p4) return asIndex ? 4 : 60;
      if (state.p5) return asIndex ? 5 : 75;
      if (state.p6) return asIndex ? 6 : 90;
      if (state.p7) return asIndex ? 7 : 105;
      return 0;
    }    
};

PCF8574_WindDir<0x20> pcf;

void setup() {
  Serial.begin(57600);
  Serial.println();
  pcf.init();
}

void loop() {
  delay(500);
  uint8_t winddir = pcf.winddirValue();
  Serial.println("winddir="+String(winddir));
}