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Diagram and i2cdevlib-master Download link

Code

#include <Wire.h> 

#include <LiquidCrystal_I2C.h>

#define SOILWATCH_PIN             A0 

#define PUMP_PIN                  2   

#define DOWN_PIN                  4   

#define UP_PIN                    3  

#define MIN_TIME_BETWEEN_WATERING 2   

#define MOISTURE_SET              0   

#define WATER_FOR_SEC             5   

LiquidCrystal_I2C lcd(0x3f, 16, 2);   // Set the LCD I2C address

void setup()

{

  pinMode ( UP_PIN, INPUT );

  pinMode ( DOWN_PIN, INPUT );

  //Set analog reference to internal 1.1V

  analogReference(INTERNAL);

  

lcd.begin();                      // initialize the lcd 

    // Print a message to the LCD.

  lcd.backlight();

  lcd.home ();                   // go home

  lcd.print("");  

  lcd.setCursor ( 0, 1 );        // go to the next line

  lcd.print ("  Et Discover  ");

  delay ( 1000 );

}

void loop()

{

   lcd.home ();

   static int dontwaterfor = MIN_TIME_BETWEEN_WATERING*10;

   static int moistureSet = MOISTURE_SET;

   static int watering = 0;

   int analogValue = analogRead(SOILWATCH_PIN);

   int moisture = map(analogValue, 0, 1023, 0, 100);

   lcd.print("Moisture: ");

   lcd.print(moisture);

   lcd.print("%   ");

   int downButton = digitalRead(DOWN_PIN);

   int upButton = digitalRead(UP_PIN);

   if(downButton == HIGH)

   {

    if(moistureSet != 0) moistureSet--;

    delay(50);

   }

   if(upButton)

   {

    if(moistureSet != 100) moistureSet++;

    delay(50);

   }

  lcd.setCursor ( 0, 1 );        // go to the next line

  lcd.print ("MoistureSet: ");

  lcd.print (moistureSet);

  lcd.print ("     "); 

  

   

   if(dontwaterfor >= 1)dontwaterfor--;

   

   if(((moisture < moistureSet) && (!dontwaterfor)) || (watering))

   {

      if(watering == 0)watering = WATER_FOR_SEC*10;

      if(watering > 1){

        digitalWrite(PUMP_PIN, HIGH);

                

      }

      else

      { 

        digitalWrite(PUMP_PIN, LOW);

        dontwaterfor = MIN_TIME_BETWEEN_WATERING*10;

      }

      watering--;

   }

 

   delay (100);

}