#include <OneWire.h>
#include <DallasTemperature.h>
#include <LiquidCrystal_I2C.h>
#include <ESP32Servo.h>

#define TEMP_PIN  1 // ESP32 pin GPIO 1 connected to DS18B20 sensor's DATA pin
#define PH_PIN 4
#define SALINITAS_PIN 5
#define DO_PIN 6
#define SERVO_ADD_WATER_PIN 14
//#define SERVO_RED_WATER_PIN 35
LiquidCrystal_I2C lcd(0x27,20,4);
Servo servoAddWater;

OneWire oneWire(TEMP_PIN);
DallasTemperature DS18B20(&oneWire);
float tempC;
float Ph;
float salinitas;
float DO;
float tempUpp=32;
float tempLow=27;


float floatMap(float x, float in_min, float in_max, float out_min, float out_max) {
  return (x - in_min) * (out_max - out_min) / (in_max - in_min) + out_min;
}

void setup() {
  Wire.begin(15,8);
  lcd.init();
  lcd.backlight();
  Serial.begin(9600); // initialize serial
  DS18B20.begin();    // initialize the DS18B20 sensor
  //Serial.println("Temperature ~ Ph ~ Salinitas ~ DO");
  servoAddWater.attach(SERVO_ADD_WATER_PIN);
  servoAddWater.write(0);
}

void loop() {
  DS18B20.requestTemperatures();       // send the command to get temperatures
  tempC = DS18B20.getTempCByIndex(0);  // read temperature in °C
  //tempF = tempC * 9 / 5 + 32; // convert °C to °F

  int analogPh = analogRead(PH_PIN);
  int analogSalinitas = analogRead(SALINITAS_PIN);
  int analogDO = analogRead(DO_PIN);

  Ph = floatMap (analogPh, 0, 4095, 0, 14);
  salinitas = floatMap (analogSalinitas, 0, 4095, 0, 50);
  DO = floatMap (analogDO, 0, 4095, 0, 40);

  lcd.clear();

  lcd.setCursor(0,0);
  lcd.print("t:");
  lcd.print(tempC,2); 
  lcd.print((char)223);
  lcd.print("C");

  lcd.setCursor(0,1);
  lcd.print("pH:");
  lcd.print(Ph);

  lcd.setCursor(0,2);
  lcd.print("salt.:");
  lcd.print(salinitas,2);
  lcd.print(" ppt");

  lcd.setCursor(0,3);
  lcd.print("DO:");
  lcd.print(DO,2);
  lcd.print(" mg/L");

  if(tempC>tempUpp){
    servoAddWater.write(90);
  };

  delay(500);
}