#include <Wire.h>
#include <Adafruit_BMP085.h>
#include <DHT.h>
#include "U8glib.h"
U8GLIB_SSD1306_128X64 u8g(U8G_I2C_OPT_NO_ACK);  // Display which does not send AC
#define DHTPIN 2
#define DHTTYPE DHT11  
DHT dht(DHTPIN, DHTTYPE);
Adafruit_BMP085 bmp;
// define pins to be used
int S1 = 3; //switch 1
int S2 = 4;
int S3 = 5;
bool first = true;
float hum = 0.0;
float temp = 0.0;
float hIndex = 0.0;
bool dht_test(float* humPerc, float* tempF, float* heatIndex);
int sensorValue = 0;
unsigned int curOutputValue = 0;
unsigned int lastOutputValue;
float pressure = 0.0;
float tempC = 0.0;
float altitude = 0.0;
void BmpSensorRead(float* pressure, float* tempC, float* altitude);
void DisplayPresTemp(float* pressure, float* tempC, float* altitude);
void setup() {                
 // initialize the digital pins.
 // assume switches will wire from ground to input pins
 pinMode(S1, INPUT_PULLUP);
 pinMode(S2, INPUT_PULLUP);
 pinMode(S3, INPUT_PULLUP); 
 Serial.begin(9600);
 dht.begin();
  lastOutputValue = ~curOutputValue;
  // assign default color value
  if (u8g.getMode() == U8G_MODE_R3G3B2)
  {
    u8g.setColorIndex(255);     // white
  }
  else if (u8g.getMode() == U8G_MODE_GRAY2BIT)
  {
    u8g.setColorIndex(3);         // max intensity
  }
  else if (u8g.getMode() == U8G_MODE_BW)
  {
    u8g.setColorIndex(1);         // pixel on
  }
  else if (u8g.getMode() == U8G_MODE_HICOLOR)
  {
    u8g.setHiColorByRGB(255, 255, 255);
  }
  for (int a = 0; a < 30; a++)
  {
    u8g.firstPage();
    do
    {
      u8g.setFont(u8g_font_fub11);
      u8g.setFontRefHeightExtendedText();
      u8g.setDefaultForegroundColor();
      u8g.setFontPosTop();
      u8g.drawStr(4, a, "FAB DATA GLASS");
    }
    while (u8g.nextPage());
  }
  delay(3000);
  if (!bmp.begin())
  {
    u8g.firstPage();
    do
    {
      u8g.setFont(u8g_font_fub11);
      u8g.setFontRefHeightExtendedText();
      u8g.setDefaultForegroundColor();
      u8g.setFontPosTop();
      u8g.drawStr(4, 0, "FAB DATA GLASS");
      u8g.drawStr(4, 20, " ERROR!");
    }
    while (u8g.nextPage());
    Serial.println("FAB DATA GLASS, ERROR!");
    while (1) {}
  }
}
void HumMeter(float* humPerc, float* temp, float* heatIndex)
{
  u8g.setFont(u8g_font_fub11);
  u8g.setFontRefHeightExtendedText();
  u8g.setDefaultForegroundColor();
  u8g.setFontPosTop();
  u8g.drawStr(4, 0, "Hum %");
  u8g.setPrintPos(80, 0);
  u8g.print(*humPerc);
#ifdef METRIC
  // if metric system, display Celsius
  u8g.drawStr(4, 20, "Temp C");
#else
  //display Farenheit
  u8g.drawStr(4, 20, "Temp F");
#endif
  u8g.setPrintPos(80, 20);
  u8g.print(*temp);
  u8g.drawStr(4, 40, "Heat Ind");
  u8g.setPrintPos(80, 40);
  u8g.print(*heatIndex);
}
bool dht_test(float* humPerc, float* temp, float* heatIndex)
{
  // Wait a few seconds between measurements.
  delay(2000);
  *humPerc = 0;
  *temp = 0;
  *heatIndex = 0;
  
  // 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 false;
  }
  // 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("Humidity: ");
  Serial.print(h);
  Serial.print(" %\t");
  Serial.print("Temperature: ");
  Serial.print(t);
  Serial.print(" *C ");
  Serial.print(f);
  Serial.print(" *F\t");
  Serial.print("Heat index: ");
  Serial.print(hic);
  Serial.print(" *C ");
  Serial.print(hif);
  Serial.println(" *F");
  *humPerc = h;
#ifdef METRIC
  // metric system, load degree celsius
  *temp = t;
  *heatIndex = hic;
#else
  *temp = f;
  *heatIndex = hif;
#endif
  return true;
   }
void LightMeter(uint16_t percentLight)
{
  u8g.setFont(u8g_font_fub17);
  u8g.setFontRefHeightExtendedText();
  u8g.setDefaultForegroundColor();
  u8g.setFontPosTop();
  u8g.drawStr(4, 0, "Light %");
  u8g.drawStr(4, 20, "Meter");
  u8g.drawFrame(4, 40, 122, 24);
  u8g.drawBox(8, 44, (114 * percentLight / 100), 16);
  //
  if (percentLight > 99)
  {
    u8g.setPrintPos(90, 15);
  }
  else
  {
    u8g.setPrintPos(100, 15);
  }
  u8g.print(percentLight);
}
void DisplayPresTemp(float* pressure, float* tempC, float* altitude)
{
  u8g.firstPage();
  do
  {
    u8g.setFont(u8g_font_fub11);
    u8g.setFontRefHeightExtendedText();
    u8g.setDefaultForegroundColor();
    u8g.setFontPosTop();
    u8g.drawStr(2, 0, "Pressure");
    u8g.setPrintPos(75, 0);
    u8g.print(*pressure);
    u8g.drawStr(4, 20, "Temp C");
    u8g.setPrintPos(75, 20);
    u8g.print(*tempC);
    u8g.drawStr(4, 40, "Altitude");
    u8g.setPrintPos(75, 40);
    u8g.print(*altitude);
  }
  while (u8g.nextPage());
}
void BmpSensorRead(float* pressure, float* tempC, float* altitude)
{
  *tempC = bmp.readTemperature();
  Serial.print("Temperature = ");
  Serial.print(*tempC);
  Serial.println(" *C");
  *pressure = bmp.readPressure() / 100.0;
  Serial.print("Pressure = ");
  Serial.print(*pressure / 100.0);
  Serial.println(" hPa");
  // Calculate altitude assuming 'standard' barometric
  // pressure of 1013.25 millibar = 101325 Pascal
  *altitude = bmp.readAltitude();
  Serial.print("Altitude = ");
  Serial.print(*altitude);
  Serial.println(" meters");
}
void loop() {
 
 if (!digitalRead(S1))
   {bool result = dht_test(&hum, &temp, &hIndex);
  if (first)
  {
    // skip displaying readings first time, as its stale data.
    first = false;
  }
  else
  {
    if(result == false)
    {
      u8g.firstPage();
      do 
      {
        // sensor error
        u8g.setFont(u8g_font_fub11);
        u8g.setFontRefHeightExtendedText();
        u8g.setDefaultForegroundColor();
        u8g.setFontPosTop();
        u8g.drawStr(10, 30, "Sensor Error");
      }
      while (u8g.nextPage());
    }
    else
    {
      u8g.firstPage();
      do
      {
        HumMeter(&hum, &temp, &hIndex);
      }
      while (u8g.nextPage());
    }
  }
}
 if (!digitalRead(S2))
   { BmpSensorRead(&pressure, &tempC, &altitude);
  DisplayPresTemp(&pressure, &tempC, &altitude);
  delay(1000);
   }
   
  if (!digitalRead(S3))
   { 
    sensorValue = analogRead(A0);
  Serial.print("input :");
  Serial.println(sensorValue);
// map input values between 0 t0 100%
  curOutputValue = map(sensorValue, 0, 690, 0, 100);
  if (curOutputValue > 100)
  {
    curOutputValue = 100;
  }
  if (lastOutputValue != curOutputValue)
  {
    lastOutputValue = curOutputValue;
    u8g.firstPage();
    do
    {
      LightMeter(curOutputValue);
    }
    while (u8g.nextPage());
  }
   }
}

#include <Wire.h>
#include <Adafruit_BMP085.h>
#include <DHT.h>
#include "U8glib.h"
U8GLIB_SSD1306_128X64 u8g(U8G_I2C_OPT_NO_ACK);  // Display which does not send AC
#define DHTPIN 2
#define DHTTYPE DHT11  
DHT dht(DHTPIN, DHTTYPE);
Adafruit_BMP085 bmp;
// define pins to be used
int S1 = 3; //switch 1
int S2 = 4;
int S3 = 5;
bool first = true;
float hum = 0.0;
float temp = 0.0;
float hIndex = 0.0;
bool dht_test(float* humPerc, float* tempF, float* heatIndex);
int sensorValue = 0;
unsigned int curOutputValue = 0;
unsigned int lastOutputValue;
float pressure = 0.0;
float tempC = 0.0;
float altitude = 0.0;
void BmpSensorRead(float* pressure, float* tempC, float* altitude);
void DisplayPresTemp(float* pressure, float* tempC, float* altitude);

void setup() {                
 // initialize the digital pins.
 // assume switches will wire from ground to input pins
 pinMode(S1, INPUT_PULLUP);
 pinMode(S2, INPUT_PULLUP);
 pinMode(S3, INPUT_PULLUP); 
 Serial.begin(9600);
 dht.begin();
  lastOutputValue = ~curOutputValue;

  // assign default color value
  if (u8g.getMode() == U8G_MODE_R3G3B2)
  {
    u8g.setColorIndex(255);     // white
  }
  else if (u8g.getMode() == U8G_MODE_GRAY2BIT)
  {
    u8g.setColorIndex(3);         // max intensity
  }
  else if (u8g.getMode() == U8G_MODE_BW)
  {
    u8g.setColorIndex(1);         // pixel on
  }
  else if (u8g.getMode() == U8G_MODE_HICOLOR)
  {
    u8g.setHiColorByRGB(255, 255, 255);
  }
  for (int a = 0; a < 30; a++)
  {
    u8g.firstPage();

    do
    {
      u8g.setFont(u8g_font_fub11);
      u8g.setFontRefHeightExtendedText();
      u8g.setDefaultForegroundColor();
      u8g.setFontPosTop();
      u8g.drawStr(4, a, "FAB DATA GLASS");
    }
    while (u8g.nextPage());
  }

  delay(3000);
  if (!bmp.begin())
  {
    u8g.firstPage();

    do
    {
      u8g.setFont(u8g_font_fub11);
      u8g.setFontRefHeightExtendedText();
      u8g.setDefaultForegroundColor();
      u8g.setFontPosTop();
      u8g.drawStr(4, 0, "FAB DATA GLASS");
      u8g.drawStr(4, 20, " ERROR!");
    }
    while (u8g.nextPage());

    Serial.println("FAB DATA GLASS, ERROR!");

    while (1) {}
  }

}
void HumMeter(float* humPerc, float* temp, float* heatIndex)
{
  u8g.setFont(u8g_font_fub11);
  u8g.setFontRefHeightExtendedText();
  u8g.setDefaultForegroundColor();
  u8g.setFontPosTop();
  u8g.drawStr(4, 0, "Hum %");
  u8g.setPrintPos(80, 0);
  u8g.print(*humPerc);
#ifdef METRIC
  // if metric system, display Celsius
  u8g.drawStr(4, 20, "Temp C");
#else
  //display Farenheit
  u8g.drawStr(4, 20, "Temp F");
#endif

  u8g.setPrintPos(80, 20);
  u8g.print(*temp);
  u8g.drawStr(4, 40, "Heat Ind");
  u8g.setPrintPos(80, 40);
  u8g.print(*heatIndex);
}
bool dht_test(float* humPerc, float* temp, float* heatIndex)
{
  // Wait a few seconds between measurements.
  delay(2000);
  *humPerc = 0;
  *temp = 0;
  *heatIndex = 0;
  
  // 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 false;
  }

  // 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("Humidity: ");
  Serial.print(h);
  Serial.print(" %\t");
  Serial.print("Temperature: ");
  Serial.print(t);
  Serial.print(" *C ");
  Serial.print(f);
  Serial.print(" *F\t");
  Serial.print("Heat index: ");
  Serial.print(hic);
  Serial.print(" *C ");
  Serial.print(hif);
  Serial.println(" *F");
  *humPerc = h;
#ifdef METRIC
  // metric system, load degree celsius
  *temp = t;
  *heatIndex = hic;
#else
  *temp = f;
  *heatIndex = hif;
#endif
  return true;
   }
void LightMeter(uint16_t percentLight)
{
  u8g.setFont(u8g_font_fub17);
  u8g.setFontRefHeightExtendedText();
  u8g.setDefaultForegroundColor();
  u8g.setFontPosTop();
  u8g.drawStr(4, 0, "Light %");
  u8g.drawStr(4, 20, "Meter");
  u8g.drawFrame(4, 40, 122, 24);

  u8g.drawBox(8, 44, (114 * percentLight / 100), 16);

  //
  if (percentLight > 99)
  {
    u8g.setPrintPos(90, 15);
  }
  else
  {
    u8g.setPrintPos(100, 15);
  }

  u8g.print(percentLight);
}
void DisplayPresTemp(float* pressure, float* tempC, float* altitude)
{
  u8g.firstPage();

  do
  {
    u8g.setFont(u8g_font_fub11);
    u8g.setFontRefHeightExtendedText();
    u8g.setDefaultForegroundColor();
    u8g.setFontPosTop();
    u8g.drawStr(2, 0, "Pressure");
    u8g.setPrintPos(75, 0);
    u8g.print(*pressure);
    u8g.drawStr(4, 20, "Temp C");
    u8g.setPrintPos(75, 20);
    u8g.print(*tempC);
    u8g.drawStr(4, 40, "Altitude");
    u8g.setPrintPos(75, 40);
    u8g.print(*altitude);
  }
  while (u8g.nextPage());
}
void BmpSensorRead(float* pressure, float* tempC, float* altitude)
{
  *tempC = bmp.readTemperature();
  Serial.print("Temperature = ");
  Serial.print(*tempC);
  Serial.println(" *C");

  *pressure = bmp.readPressure() / 100.0;
  Serial.print("Pressure = ");
  Serial.print(*pressure / 100.0);
  Serial.println(" hPa");

  // Calculate altitude assuming 'standard' barometric
  // pressure of 1013.25 millibar = 101325 Pascal
  *altitude = bmp.readAltitude();
  Serial.print("Altitude = ");
  Serial.print(*altitude);
  Serial.println(" meters");
}
void loop() {
 
 if (!digitalRead(S1))
   {bool result = dht_test(&hum, &temp, &hIndex);

  if (first)
  {
    // skip displaying readings first time, as its stale data.
    first = false;
  }
  else
  {
    if(result == false)
    {
      u8g.firstPage();
      do 
      {
        // sensor error
        u8g.setFont(u8g_font_fub11);
        u8g.setFontRefHeightExtendedText();
        u8g.setDefaultForegroundColor();
        u8g.setFontPosTop();
        u8g.drawStr(10, 30, "Sensor Error");
      }
      while (u8g.nextPage());
    }
    else
    {
      u8g.firstPage();
      do
      {
        HumMeter(&hum, &temp, &hIndex);
      }
      while (u8g.nextPage());
    }
  }
}

 if (!digitalRead(S2))
   { BmpSensorRead(&pressure, &tempC, &altitude);
  DisplayPresTemp(&pressure, &tempC, &altitude);
  delay(1000);
   }
   
  if (!digitalRead(S3))
   { 
    sensorValue = analogRead(A0);
  Serial.print("input :");
  Serial.println(sensorValue);
// map input values between 0 t0 100%
  curOutputValue = map(sensorValue, 0, 690, 0, 100);

  if (curOutputValue > 100)
  {
    curOutputValue = 100;
  }

  if (lastOutputValue != curOutputValue)
  {
    lastOutputValue = curOutputValue;
    u8g.firstPage();

    do
    {
      LightMeter(curOutputValue);
    }
    while (u8g.nextPage());
  }

   }
}