Temperature and Humidity Sensor Code

/*
*Divya Inaganti
*June, 16, 2017
*Temperature and Humidity Sensor
*/
//www.elegoo.com
//2016.06.13

#include <SimpleDHT.h>

// for DHT11,
//      VCC: 5V or 3V
//      GND: GND
//      DATA: 2
int pinDHT11 = 2;
SimpleDHT11 dht11;
const int photoPin = A0;
const int PinRed= 9;
const int PinGreen=10;
const int PinBlue= 11;
int photoValue= 0;
int lightVal= 0;
const int pinButton = 4;
int newButton = 0;
int lastButton = 0;
unsigned long timeVal;
int minimum= 1000;
int maximum= -1000;
void setup() {

  Serial.begin (9600);
 pinMode(photoPin, INPUT);
  pinMode (PinRed, OUTPUT);
  pinMode (PinGreen, OUTPUT);
  pinMode (PinBlue, OUTPUT);
  pinMode(pinButton, INPUT);


analogWrite(PinRed, 255);
analogWrite(PinGreen, 0);
analogWrite(PinBlue,0);
delay(200);
analogWrite(PinRed, 0);
analogWrite(PinGreen, 255);
analogWrite(PinBlue,0);
delay(200);
analogWrite(PinRed, 0);
analogWrite(PinGreen, 0);
analogWrite(PinBlue,255);
delay(200);
analogWrite(PinRed, 0);
analogWrite(PinGreen, 0);
analogWrite(PinBlue,0);

}
 void calibrate()
{
  maximum = -5000;
  minimum = 5000;
  analogWrite(PinGreen, 0);
  analogWrite(PinRed, 0);
  analogWrite(PinBlue, 0);
  delay(200);
  analogWrite(PinRed, 255);
  delay(200);
  analogWrite(PinRed, 0);

 timeVal = millis();
 while(millis()- timeVal < 5000)
{
  photoValue = analogRead(photoPin);
  if(photoValue > maximum)
  {
    maximum = photoValue;
  }
  else if(photoValue < minimum)
  {
    minimum = photoValue;
  }
 }
  Serial.println(minimum);
  Serial.println(maximum);
    analogWrite(PinGreen, LOW);
    delay(200);
    analogWrite(PinRed, LOW);
}
 boolean debounce(boolean last)
 {

  boolean current = digitalRead(pinButton);
  if (last != current)
  {
    delay(5);
    current = digitalRead(pinButton);
  }
}

void loop() {
  // start working...
  Serial.print