smartGarden.ino

//add DHT sensor library
#include <DHT.h>
//add LCD library
#include <rgb_lcd.h>
//add ChainableLED library to this project
#include <ChainableLED.h>
//add Timelib library
#include <TimeLib.h>

//assign default time as epoch time 1514764800 which is 00:00:00 Jan 1 2018
long DEFAULT_TIME = 1514764800;
long waterTime = DEFAULT_TIME + 86400;

//set the number of leds linked to the chain
#define NUM_LEDS  1

//assign LightSensor as A0
#define LightSensor A0
//set digital pin2 as DHTPIN
#define DHTPIN 2
//set title of pin 5 as tiltSwitch
#define tiltSwitch 5
//assign buzzer as pin 6
#define buzzer 6

//set the sensor type as DHT 11
#define DHTTYPE DHT11

/*assign dht as the name of DHT sensor
  set the sensor pin as DHTPIN(pin2),
  set the sensor type as DHTTYPE(DHT11)
*/
DHT dht(DHTPIN, DHTTYPE);

/*assign leds as the name of
  the ChainableLED set the
  pin of the ChainableLED to
  pin7(clock pin) and pin8(data pin)
  and number of the leds*/
ChainableLED leds(7, 8, NUM_LEDS);

//assign lcd as the name of rgb_lcd screen
rgb_lcd lcd;

void setup()
{
  //
  setTime(DEFAULT_TIME);
  //initialise the dht sensor
  dht.begin();
  //initialise the lcd screen;
  //set up the lcd's number of columns and rows:
  lcd.begin(16, 2);
  //initialise ChainableLED leds
  leds.init();
  //set pin 5(tilt switch) as input pin
  pinMode(tiltSwitch, INPUT);
  delay(1000);
}
int mode = 0;
void loop()
{
  //-------------DHT---------------------
  //store the humidity value to h
  int h = dht.readHumidity();

  //store the temperature value to t(in Celsius)
  int t = dht.readTemperature();

  int value = analogRead(LightSensor);
  float value_float = map(value, 0, 800, 50, 0) / 100.0;

  leds.setColorHSB(0, 0, 0, value_float);

  //initialise mode to 0, then set to case 0;

  //temperature exceed 38 degrees, then set to case 1;
  if (t > 38) {
    mode = 1;
  }
  //Humidity is less than 40 %, then set to case 2;
  if (h < 40)
  {
    mode = 2;
  }
  //LightSensor reading value is less than 50, then set to case 3;
  if (value < 50)
  {
    mode = 3;
  }
  //current time is greate or equals to waterTime(24 hour ahead), then set to case 4;
  if (now() >= waterTime  ) {
    mode = 4;
  }

  switch (mode) {
    case 0:
      //set the LCD cursor to column 0, line 0
      lcd.clear();
      lcd.setCursor(0, 0);
      //Print text temperature: to the LCD
      lcd.print("Temperature:");
      //set the LCD cursor to column 12, line 0
      lcd.setCursor(12, 0);
      //Print temperature value t to the LCD
      lcd.print(t);
      //set the LCD cursor to column 14, line 0
      lcd.setCursor(14, 0);
      //Print temperature º is character 223 on lookup table
      lcd.write(223);
      //Print C to the LCD
      lcd.print("C");

      //set the LCD cursor to column 0, line 1
      lcd.setCursor(0, 1);
      //Print text Humidity: to the LCD
      lcd.print("Humidity: ");
      //set the LCD cursor to column 10, line 1
      lcd.setCursor(10, 1);
      //Print humidity value h to the LCD
      lcd.print(h);
      //set the LCD cursor to column 12, line 1
      lcd.setCursor(12, 1);
      //Print sign % to the LCD
      lcd.print("%");
      break;
    case 1:
      tone(buzzer, 262, 300);
      leds.setColorRGB(0, 255, 0, 0);
      lcd.clear();
      lcd.setCursor(0, 0);
      lcd.print("Temperature too ");
      lcd.setCursor(0, 1);
      lcd.print("High!!");
      if (HIGH == digitalRead(tiltSwitch))
      {
        leds.setColorRGB(0, 0, 0, 0);
        mode = 0;
      }
      break;
    case 2:
      tone(buzzer, 294, 300);
      leds.setColorRGB(0, 255, 0, 0);
      lcd.clear();
      lcd.setCursor(0, 0);
      lcd.print("Warning! Too Dry");
      if (HIGH == digitalRead(tiltSwitch))
      {
        leds.setColorRGB(0, 0, 0, 0);
        mode = 0;
      }
      break;
    case 3:
      tone(buzzer, 330, 300);
      leds.setColorRGB(0, 255, 0, 0);
      lcd.clear();
      lcd.setCursor(0, 0);
      lcd.print("Not Enough Light");
      lcd.setCursor(0, 1);
      lcd.print("Check the LED..");
      if (HIGH == digitalRead(tiltSwitch))
      {
        leds.setColorRGB(0, 0, 0, 0);
        mode = 0;
      }
      break;
    case 4:
      tone(buzzer, 349, 300);
      leds.setColorRGB(0, 255, 0, 0);
      lcd.clear();
      lcd.setCursor(0, 0);
      lcd.print("Time to water");
      lcd.setCursor(0, 1);
      lcd.print("the plants");
      if (HIGH == digitalRead(tiltSwitch))
      {
        waterTime = now() + 86400;
        mode = 0;
      }
      break;

  }
}