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AirQualityDisplay.ino
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AirQualityDisplay.ino
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#include <Rotary.h>
#include <Wire.h>
#include <LiquidCrystal_I2C.h>
#include <SFE_BMP180.h>
#include <dht.h>
#include "MQ135.h"
#include "MQ7.h"
#include <DS1302RTC.h>
#include <TimeLib.h>
#define BUZZER 8
#define ROTPINA 2
#define ROTPINB 3
#define MQ135PIN 15
#define MQ7PIN 16
#define MQ3PIN 17
#define PHOTOCELLPIN 14
//Rotary Encoder
Rotary r = Rotary(2, 3);
// Humidity Sensor
dht DHT;
#define DHT11_PIN 10
#define NUMBEROFSCEENS 2
// Pressure Sensor
SFE_BMP180 pressure;
#define ALTITUDE 355.0
// Real Time Clock
DS1302RTC RTC(7, 6, 5);
// LCD Display
LiquidCrystal_I2C lcd(0x3F, 20, 4);
// Gas Sensors
MQ135 mq135 = MQ135(MQ135PIN);
MQ7 mq7(A2, 5.0);
int position = 0;
//Most Recent Readings
double humidity = 0.0;
double temperatureDHT = 0.0;
double temperatureBMP = 0.0;
double absolutePressure = 0.0; //mb
double pressureSeaLevelCompensated = 0.0; //mb
double altitude = 0.0; //meters
float mq135ppm = 0.0;
float mq7ppm = 0.0;
int mq3value = 0;
int photocellReading = 0;
time_t t;
void lcdPrintTime() {
// Display time centered on the upper line
lcd.setCursor(5, 0);
print2digits(hour());
lcd.print(":");
print2digits(minute());
lcd.print(":");
print2digits(second());
lcd.setCursor(0,1);
lcd.print(year());
lcd.print("-");
print2digits(month());
lcd.print("-");
print2digits(day());
lcd.print(" ");
lcd.print(dayShortStr(weekday()));
// Warning!
if (timeStatus() != timeSet) {
lcd.setCursor(0, 1);
lcd.print(F("RTC ERROR: SYNC!"));
}
}
void lcdDisplayScreens(int position) {
lcd.clear();
lcd.setCursor(0, 0);
switch (position) {
case 0:
lcdPrintTime();
lcd.setCursor(0, 2);
lcd.print(temperatureBMP);
lcd.print((char)223);
lcd.print("C, ");
lcd.print(humidity);
lcd.print(" %H20 ");
lcd.setCursor(0, 3);
lcd.print("Pressure: ");
lcd.print(absolutePressure);
lcd.print(" mb");
lcd.setCursor(0, 3);
break;
case 1:
lcd.print("MQ135(CO2):");
lcd.print(mq135ppm);
lcd.print(" ppm");
lcd.setCursor(0, 1);
lcd.print("MQ7(C0): ");
lcd.print(mq7ppm);
lcd.print(" ppm");
lcd.setCursor(0, 2);
lcd.print("MQ3(Alk.): ");
lcd.print(mq3value);
lcd.print("");
lcd.setCursor(0, 3);
lcd.print("Light Lvl: ");
lcd.print(photocellReading);
break;
default:
break;
}
}
void serialPrintSensors() {
if (false) {
Serial.print("Humditiy ");
Serial.print(humidity);
Serial.println(" %");
Serial.print("Temperature from DHT ");
Serial.print(temperatureDHT);
Serial.println(" C");
Serial.print("Temperature from BMP ");
Serial.print(temperatureBMP);
Serial.println(" C");
Serial.print("Absolute Pressure ");
Serial.print(absolutePressure);
Serial.println(" mb");
Serial.print("Pressure Sea Level Compensated ");
Serial.print(pressureSeaLevelCompensated);
Serial.println(" mb");
Serial.print("Altitude ");
Serial.print(altitude);
Serial.println(" m");
Serial.print("MQ135 ");
Serial.print(mq135ppm);
Serial.println(" ppm");
Serial.print("MQ7 ");
Serial.print(mq7ppm);
Serial.println(" ppm");
Serial.print("MQ3 ");
Serial.print(mq3value);
Serial.println("");
Serial.print("Photocellreading ");
Serial.print(photocellReading);
Serial.println("");
}
}
void updateSensors() {
updateHumidity();
updatePressureReadings();
mq135ppm = mq135.getPPM();
mq7ppm = mq7.getPPM();
mq3value = analogRead(MQ3PIN);
photocellReading = analogRead(PHOTOCELLPIN);
}
void updateHumidity() {
int chk = DHT.read11(DHT11_PIN);
temperatureDHT = DHT.temperature;
humidity = DHT.humidity;
}
void print2digits(int number) {
// Output leading zero
if (number >= 0 && number < 10) {
lcd.write('0');
}
lcd.print(number);
}
void updatePressureReadings() {
char status;
status = pressure.startTemperature();
if (status != 0) {
delay(status);
status = pressure.getTemperature(temperatureBMP);
}
status = pressure.startPressure(3);
if (status != 0) {
delay(status);
status = pressure.getPressure(absolutePressure, temperatureBMP);
}
pressureSeaLevelCompensated = pressure.sealevel(absolutePressure, ALTITUDE);
altitude = pressure.altitude(absolutePressure, pressureSeaLevelCompensated);
}
void setup() {
Serial.begin(9600);
lcd.init();
pressure.begin();
t = now();
if (RTC.writeEN())
lcd.print("Write allowed.");
else
lcd.print("Write protected.");
// Print a message to the LCD.
lcd.backlight();
setSyncProvider(RTC.get);
//Rotary encoder stuff
r.begin();
PCICR |= (1 << PCIE2);
PCMSK2 |= (1 << PCINT18) | (1 << PCINT19);
sei();
}
//Rotary Encoder ISR
ISR(PCINT2_vect) {
unsigned char result = r.process();
if (result == DIR_NONE) {
// do nothing
}
else if (result == DIR_CW) {
Serial.println("ClockWise");
position = position >= NUMBEROFSCEENS - 1? position : position + 1;
}
else if (result == DIR_CCW) {
Serial.println("CounterClockWise");
position = position <= 0? position : position - 1;
}
}
void loop() {
lcdDisplayScreens(position);
updateSensors();
serialPrintSensors();
delay ( 750 ); // Wait approx 1 sec
}