#include <LiquidCrystal_PCF8574.h>

#include <DallasTemperature.h>

#include <ArduinoJson.h>

LiquidCrystal_PCF8574 lcd(0x27);

// DS18B20 data wire

#define ONE_WIRE_BUS 2

// Setup a oneWire instance to communicate with any OneWire devices (not just Maxim/Dallas temperature ICs)

OneWire oneWire(ONE_WIRE_BUS);

// Pass our oneWire reference to Dallas Temperature.

DallasTemperature sensors(&oneWire);

#define pin_A0 0

#define pin_I0 4

#define pin_I1 5

#define pin_I2 6

#define pin_I3 7

#define I0 digitalRead(pin_I0)

#define I1 digitalRead(pin_I1)

#define I2 digitalRead(pin_I2)

#define I3 digitalRead(pin_I3)

#define Q0 19

#define Q1 18

#define Q2 10

#define Q3 3

char texto[] = "COM TEST";

int ADC_0;

float tempC;

char grados = 223;

String Json_recibir = "";

boolean stringComplete;

byte salidas;

unsigned long currentTime = millis();

unsigned long previousTime = 0;

const long timeoutTime = 1000;

byte pin_state_high[] = {0x00,0x1F,0x1F,0x1F,0x1F,0x1F,0x1F,0x00};

byte pin_state_low[] = {0x00,0x1F,0x11,0x11,0x11,0x11,0x1F,0x00};

void display_update() {

  lcd.setCursor(0,0);

  lcd.print(texto);

  lcd.setCursor(0,1);

  lcd.print("I: ");

  lcd.write(I0);

  lcd.write(I1);

  lcd.write(I2);

  lcd.write(I3);

  lcd.setCursor(0,2);

  lcd.print("   0123");

  lcd.setCursor(0,3);

  lcd.print("Q: ");

  lcd.write(digitalRead(Q0));

  lcd.write(digitalRead(Q1));

  lcd.write(digitalRead(Q2));

  lcd.write(digitalRead(Q3));

  lcd.setCursor(12,1);

  lcd.print("A0:    ");

  lcd.setCursor(15,1);

  lcd.print(ADC_0);

  lcd.setCursor(12,2);

  lcd.print("T");

  lcd.print((char) grados);

  lcd.print(":     ");

  lcd.setCursor(15,2);

  if (tempC == -127)

    lcd.print("Error");

  else

    lcd.print(tempC,1);

}

void setup() {

  // put your setup code here, to run once:

  pinMode(pin_I0, INPUT);

  pinMode(pin_I1, INPUT);

  pinMode(pin_I2, INPUT);

  pinMode(pin_I3, INPUT);

  pinMode(Q0, OUTPUT);

  pinMode(Q1, OUTPUT);

  pinMode(Q2, OUTPUT);

  pinMode(Q3, OUTPUT);

  Serial.begin(9600);

  sensors.begin();

  lcd.begin(20, 4); // initialize the lcd

  lcd.createChar(0, pin_state_low);

  lcd.createChar(1, pin_state_high);

  delay(200);

  lcd.setBacklight(255);

}

void loop() {

  // put your main code here, to run repeatedly:

  ADC_0 = analogRead(pin_A0);

  currentTime = millis();

  if (currentTime - previousTime >= timeoutTime)

  {

    previousTime = currentTime;

    sensors.requestTemperatures(); // Send the command to get temperatures

    tempC = sensors.getTempCByIndex(0);

  }

  // Create the JSON document

  StaticJsonDocument<200> Json_enviar;

  Json_enviar["sensor"] = ADC_0;

  Json_enviar["temperatura"] = tempC;

  Json_enviar["entradas"] = I0 * 1 + I1 * 2 + I2 * 4 + I3 * 8;

  serializeJson(Json_enviar, Serial);

  Serial.println();

  if (stringComplete==true)

  {

    StaticJsonDocument<300> Datos_recibir;

    DeserializationError err = deserializeJson(Datos_recibir, Json_recibir);

    if (err == DeserializationError::Ok)

    {

      salidas = Datos_recibir["salidas"].as<byte>();

      digitalWrite(Q0, salidas & 1);

      digitalWrite(Q1, salidas & 2);

      digitalWrite(Q2, salidas & 4);

      digitalWrite(Q3, salidas & 8);

    }

    // clear the string:

    Json_recibir = "";

    stringComplete = false;

  }

  display_update();

}

/*

  SerialEvent occurs whenever a new data comes in the hardware serial RX. This

  routine is run between each time loop() runs, so using delay inside loop can

  delay response. Multiple bytes of data may be available.

*/

void serialEvent() {

  Json_recibir = Serial.readStringUntil(10);

  stringComplete = true;

}