Arduino Auto Plant Watering

arduino-auto-plant-watering.ino

#include <LiquidCrystal_I2C.h>

/*
   Automatic chili & tomato plant watering
   Analog humidity sensors connected to A1 and A2
   Mini 3V pumps connected to relay
   Relay inputs connected to Digital pins 1 and 2
   Relay ground connected to Arduino if not externaly powered (5V), if yes connect ground of external power supply (+ on JD-VCC, - on GRD)
   Humidity sensory values:
   +-580 and more completely dry,
   +- 500 begins to need watering
   +- 300 and less completely under water
   2021 CHAUSSY Jhang
*/

//initialize the liquid crystal library
//the first parameter is the I2C address
//the second parameter is how many rows are on your screen
//the third parameter is how many columns are on your screen
LiquidCrystal_I2C lcd(0x27, 20, 4);

// Init pins
int plantSensor1 = A0;
int plantSensor2 = A1;
// int lightSensor = A3;
// int tempSensor = A4;
int pump1 = 8;
int pump2 = 9;
// int buttonToggle = 5;
// int display1 = 6;
// int display2 = 7;

// Init vars
int plantSensor1Val = 0;
int plantSensor1ValPercent = 0;
int plantSensor2Val = 0;
int plantSensor2ValPercent = 0;
int pump1Counter = 0;
int pump1CounterRun = 0;
int pump2Counter = 0;
int pump2CounterRun = 0;

void setup()
{
  Serial.begin(9600); // DEBUG

  // Set digital pins mode
  pinMode(pump1, OUTPUT);
  pinMode(pump2, OUTPUT);
  //  pinMode(buttonToggle, INPUT_PULLUP);

  // Init pump relays HIGH (off)
  digitalWrite(pump1, HIGH); // Pump relays switch on on LOW
  digitalWrite(pump2, HIGH);

  //initialize lcd screen
  lcd.init();
  // turn on the backlight
  lcd.backlight();

  Serial.println("Setup done."); // DEBUG
}

void loop()
{
  // Read humidity sensors
  plantSensor1Val = analogRead(plantSensor1);
  plantSensor2Val = analogRead(plantSensor2);

  // Map to percentage
  plantSensor1ValPercent = map(plantSensor1Val, 300, 600, 0, 100);
  plantSensor2ValPercent = map(plantSensor2Val, 300, 600, 0, 100);

  String x = String(plantSensor1ValPercent);
  String y = String(plantSensor2ValPercent);

  lcd.setCursor(0, 0);
  String t1 = "Plant 1 Raw: ";
  String t2 = t1 + plantSensor1Val;
  lcd.print(t2);
  lcd.setCursor(0, 1);
  String t3 = "Plant 1 %: ";
  String t4 = t3 + plantSensor1ValPercent + " " + pump1CounterRun;
  lcd.print(t4);
  lcd.setCursor(0, 2);
  String t5 = "Plant 2 Raw: ";
  String t6 = t5 + plantSensor2Val;
  lcd.print(t6);
  lcd.setCursor(0, 3);
  String t7 = "Plant 2 %: ";
  String t8 = t7 + plantSensor2ValPercent + " " + pump2CounterRun;
  lcd.print(t8);

  Serial.print("plantSensor1: ");  // DEBUG
  Serial.print(plantSensor1Val);   // DEBUG
  Serial.print(" plantSensor2: "); // DEBUG
  Serial.print(plantSensor2Val);   // DEBUG
  Serial.println(" ");

  Serial.print("plantSensor1%: ");      // DEBUG
  Serial.print(plantSensor1ValPercent); // DEBUG
  Serial.print(" plantSensor2%: ");     // DEBUG
  Serial.print(plantSensor2ValPercent); // DEBUG
  Serial.println(" ");

  // Decrement counters
  if (pump1Counter != 0)
  {
    pump1Counter--;
  }
  if (pump2Counter != 0)
  {
    pump2Counter--;
  }

  if (plantSensor1Val > 480 && pump1Counter == 0)
  {
    Serial.println("Watering plant1"); // DEBUG
    digitalWrite(pump1, LOW);
    delay(5000);
    digitalWrite(pump1, HIGH);
    // Set countdown to 10 to wait 10 iterations before watering again
    pump1Counter = 900;
    pump1CounterRun++;
  }

  if (plantSensor2Val > 450 && pump2Counter == 0)
  {
    Serial.println("Watering plant2"); // DEBUG
    digitalWrite(pump2, LOW);
    delay(5000);
    digitalWrite(pump2, HIGH);
    // Set countdown to 10 to wait 10 iterations before watering again
    pump2Counter = 900;
    pump2CounterRun++;
  }
   
  // Check once every minute
  delay(1000 * 60);
}