Problem with GPIO Shield for Arduino V1.0 SKU: DFR0334

#if defined(ARDUINO) && ARDUINO >= 100
#include "Arduino.h"
#else
#include "WProgram.h"
#endif

#include "clsPCA9555.h"
#include "Wire.h"

PCA9555 ioport(0x20);

//all above is to intialise GPIO Shield

#include "DHT.h"

#define DHTPIN 2 // what digital pin we're connected to

// Uncomment whatever type you're using!
//#define DHTTYPE DHT11   // DHT 11
#define DHTTYPE DHT22   // DHT 22  (AM2302), AM2321
//#define DHTTYPE DHT21   // DHT 21 (AM2301)

// Connect pin 1 (on the left) of the sensor to +5V
// NOTE: If using a board with 3.3V logic like an Arduino Due connect pin 1
// to 3.3V instead of 5V!
// Connect pin 2 of the sensor to whatever your DHTPIN is
// Connect pin 4 (on the right) of the sensor to GROUND
// Connect a 10K resistor from pin 2 (data) to pin 1 (power) of the sensor

// Initialize DHT sensor.
// Note that older versions of this library took an optional third parameter to
// tweak the timings for faster processors.  This parameter is no longer needed
// as the current DHT reading algorithm adjusts itself to work on faster procs.
DHT dht(DHTPIN, DHTTYPE);
//pir motion sensor
byte sensorPin = 3;
byte indicator = 13;


void setup() {
  Serial.begin(9600);
  pinMode(sensorPin,INPUT);
  pinMode(indicator,OUTPUT);
  Serial.println("DHTxx test!");
  ioport.pinMode(2, INPUT);  //Button
  dht.begin();
}

void loop() {
  // Wait a few seconds between measurements.
  delay(2000);

  // Reading temperature or humidity takes about 250 milliseconds!
  // Sensor readings may also be up to 2 seconds 'old' (its a very slow sensor)
  float h = dht.readHumidity();
  // Read temperature as Celsius (the default)
  float t = dht.readTemperature();
  // Read temperature as Fahrenheit (isFahrenheit = true)
  float f = dht.readTemperature(true);

  // Check if any reads failed and exit early (to try again).
  if (isnan(h) || isnan(t) || isnan(f)) {
    Serial.println("Failed to read from DHT sensor!");
    return;
  }
   byte state = digitalRead(sensorPin);
  digitalWrite(indicator,state);
  

     // read the input on analog pin A0:
  int sensorValue0 = analogRead(A0);
  // Convert the analog reading (which goes from 0 - 1023) to a voltage (0 - 5V):
  float voltage0 = sensorValue0;
  // print out the value you read:
 
  
  int sensorValue1 = analogRead(A1);
  // Convert the analog reading (which goes from 0 - 1023) to a voltage (0 - 5V):
  float voltage1 = sensorValue1;
  // print out the value you read:

  // Compute heat index in Fahrenheit (the default)
  float hif = dht.computeHeatIndex(f, h);
  // Compute heat index in Celsius (isFahreheit = false)
  float hic = dht.computeHeatIndex(t, h, false);

  Serial.print("Motion:");
  if(state == 1)Serial.print("1\t");
  else if(state == 0)Serial.print("0\t");
  Serial.print("CO2 Level:");
  Serial.print(voltage0);
  Serial.print("\t");
  Serial.print("Noise Level:");
  Serial.print(sensorValue1);
  Serial.print("\t");
  Serial.print("Humidity: ");
  Serial.print(h);
  Serial.print(" %\t");
  Serial.print("Temperature: ");
  Serial.print(t);
  Serial.println(" *C ");
  //Serial.print(f);
  //Serial.print(" *F\t");
  //Serial.print("Heat index: ");
  //Serial.print(hic);
  //Serial.print(" *C ");
  //Serial.print(hif);
  //Serial.println(" *F");
}