#include <LiquidCrystal.h>
#include <dht.h>
#define dht_apin A0
dht DHT;

const int rs = 12, en = 11, d4 = 5, d5 = 4, d6 = 3, d7 = 2;
LiquidCrystal lcd(rs, en, d4, d5, d6, d7);
int con = 0;
const int sense_pin = A1;
int relay = 8;
int pump = 0;

void setup() {
  pinMode(relay, OUTPUT);
  Serial.begin(9600);
  Serial.println("Welcome to Plant Environment Reader");
  lcd.begin(16, 2);
  delay(1000);
  lcd.clear();
  lcdTemplate();
}

void loop() {
  DHT.read22(dht_apin);
  int moisture;
  float sense_apin;
  sense_apin = analogRead(sense_pin);
  moisture = (100 - ((sense_apin / 1023) * 100));

  Serial.print("\nT:");
  pad (DHT.temperature);
  Serial.print(DHT.temperature);
  Serial.write(176);
  Serial.print("C ");
  Serial.print("| H:");
  pad (DHT.humidity);
  Serial.print(DHT.humidity);
  Serial.print("% ");
  Serial.print("| M:");
  pad (moisture);
  Serial.print(moisture);
  Serial.print("% ");
  Serial.print("| P:");
  Serial.print(pump);

  if (moisture < 15) {
    digitalWrite(relay, HIGH);
    pump = 1;
  } else {
    digitalWrite(relay, LOW);
    pump = 0;
  }

  if (DHT.temperature < 60 || DHT.temperature > -30 && DHT.humidity > 0) {
    lcd.setCursor(2, 0);
    pad (DHT.temperature);
    lcd.print(DHT.temperature);

    lcd.setCursor(2, 1);
    pad (DHT.humidity);
    lcd.print(DHT.humidity);

    lcd.setCursor(12, 0);
    pad (moisture);
    lcd.print(moisture);

    lcd.setCursor(13, 1);
    if (pump == 0) {
      lcd.print("OFF");
    } else {
      lcd.print("ON ");
    }
  }

  if (DHT.temperature > 60 || DHT.temperature < -30 || DHT.humidity == 0) {
    lcd.clear();
    lcd.setCursor(0, 0);
    lcd.print(" Maybe an error");
    lcd.setCursor(0, 1);
    lcd.print("  has occured!");
    delay(2000);
    lcd.clear();
    lcdTemplate();
  }
  delay(2000);
}

void lcdTemplate() {
  lcd.setCursor(0, 0);
  lcd.print("T:");
  lcd.setCursor(8, 0);
  // lcd.write(223); // LCD degree symbol
  lcd.print("C");

  lcd.setCursor(0, 1);
  lcd.print("H:");
  lcd.setCursor(8, 1);
  lcd.print("%");

  lcd.setCursor(10, 0);
  lcd.print("M:");
  lcd.setCursor(15, 0);
  lcd.print("%");

  lcd.setCursor(10, 1);
  lcd.print("P:");
}

void pad(int val) {
  if (val >= 0) {
    if (val < 100) {
      Serial.print(" ");
      lcd.print(" ");
    }
    if (val < 10) {
      Serial.print(" ");
      lcd.print(" ");
    }
  }
}