Basic Code:


//Auto Garden watering with moisture and light sensitivity

//////////////Initialization//////////////
#include <LiquidCrystal.h>  //include LCD library
int MoistSensePin = 0;  //Designate moisture sensor analog pin to 0
int LightSensePin = 1;  //Designate light sensor analog pin to 1
int Solenoid =3;        //Designate solenoid control pin to 3
LiquidCrystal lcd(7, 8, 9, 10, 11, 12); //initialize LCD pins

void setup()
{
  pinMode(Solenoid, OUTPUT);   // Sets Solenoid Pin to output for sending 5v to mosfet gate
  pinMode(5, OUTPUT);
  pinMode(6, OUTPUT);
  Serial.begin(9600); 
  lcd.begin(16, 4);  // set up the LCD's number of columns and rows:
  lcd.print("-Watering Criteria-");  //Prints message in quotes
}

//////////Beginning of Loop ////////////////////////

void loop()
{
  float sensor = analogRead(MoistSensePin); //retrieve sensor value
  float light = analogRead(LightSensePin); //retrieve light sensor value
 
  delay(2000); //2 sec delay
  digitalWrite(5, HIGH); //Set status Led to On
  delay(250); //2 sec delay
  digitalWrite(5, LOW); //Set status Led to off
 
  lcd.setCursor(0, 1);  //Setup txt to follow on the third line
  lcd.print("Moisture:");
 
  lcd.setCursor(10, 1);   //setup txt to follow on the first line
  lcd.print(sensor);     //print "sensor" value to LCD
  delay(1000);           //Delay by 1000 cycles sensor value  for easier readability
  
  lcd.setCursor(0, 2);  //Setup txt to follow on the third line
  lcd.print("Light:");  
  
  lcd.setCursor(7, 2);  //Setup txt to follow on the third line
  lcd.print(light);     //print "light" value to LCD
  delay(1000);  //Delay by 1000 cycles light value  for easier readability
 
 
  Serial.print("light: ");
  Serial.println(light);  //print "light" variable output to serial monitor for diagnostics
  delay(1000);            //Delay by 1000 cycles light value  for easier readability

  Serial.print("moisture: ");
  Serial.println(sensor); //print "sensor" variable output to serial monitor for diagnostics
  delay(1000);            //Delay by 1000 cycles sensor value  for easier readability



  //////////beginning of the nested loop for solenoid control based on light and sensor values/////////////////////
 
  if (light>200)  //initialization of loop controlled by the light value to determine day or night for plant safety
  {
    if (sensor>190)  //if light is safe then ask if the moisture sensor is dry enough to start watering
    {
      lcd.setCursor(0, 4);    //set starting point of text to second line of LCD
      lcd.print("!Active!"); //print active to diagnose if watering is determined to be needed
     
      digitalWrite(6, HIGH); //Set  water status Led to On
      digitalWrite(3, HIGH);    //if watering is needed the solenoid is set to high triggering solenoid
      delay(60000);  //waters for 1min
      digitalWrite(3, LOW);
            
     
    }
    else    //alternative if not dry enough for watering
    { 
      digitalWrite(3,LOW);   //set mosfet gate to low to disable or keep the solenoid disabled
      digitalWrite(6, LOW);
      lcd.setCursor(0, 4);     //set starting text to second line of LCD
      lcd.print("Inactive!");  //print Inactive! to dertime of the solenoid has been disabled
    }
  }
  else  //alternative if not dark enough for watering
  {
    digitalWrite(3,LOW);      //keep the mosfet gate pin to low to maintain off status if not dark enough for watering
    digitalWrite(6, LOW);
    lcd.setCursor(0, 4);   //set text position to second position
    lcd.print("Inactive!"); //print "Inactive!" to make aware its not dark enough and Inactive status is maintained
  }
}