//#include <ESP8266WiFi.h>
#include <WiFi.h>
#include <PubSubClient.h>


//pino do trigger
#define TRIGGER_PIN 19 
//pino do echo
#define ECHO_PIN 18

const char* ssid = "Wokwi-GUEST";
const char* password = "";
const char* mqtt_server = "test.mosquitto.org";

WiFiClient WOKWI_client;
PubSubClient client(WOKWI_client);


void setup_wifi() {

  delay(10);
  Serial.println();
  Serial.print("Connecting to ");
  Serial.println(ssid);

  WiFi.mode(WIFI_STA);
  WiFi.begin(ssid, password);

  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }


  Serial.println("");
  Serial.println("WiFi connected");
  Serial.println("IP address: ");
  Serial.println(WiFi.localIP());
}



void reconnect() {
  while (!client.connected()) {
    Serial.print("Attempting MQTT connection...");
   
    if (client.connect("WOKWI_client")) {
      Serial.println("connected");
     
    } else {
      Serial.print("failed, rc=");
      Serial.print(client.state());
      Serial.println(" try again in 5 seconds");
      delay(5000);
    }
  }
}




void setup() { 
  Serial.begin(115200);
  Serial.println("Exibição de Peso ESP32");
  setup_wifi();
  client.setServer(mqtt_server, 1883);
  //definindo o tipo de input ou output dos pinos
  pinMode(TRIGGER_PIN, OUTPUT);
  pinMode(ECHO_PIN, INPUT);

}

void Conectado_Wifi(){
  if (WiFi.status())
  digitalWrite(2, HIGH);
  else
  digitalWrite(2, LOW);
}
void Conectado_Mosquito(){
  if (client.connected())
  digitalWrite(15, HIGH);
  else
  digitalWrite(15, LOW);
}



void envio_temp() {
  long duration;
  float distance;

  // Gera um pulso curto no pino TRIGGER
  digitalWrite(TRIGGER_PIN, LOW);
  delayMicroseconds(2);
  digitalWrite(TRIGGER_PIN, HIGH);
  delayMicroseconds(10);
  digitalWrite(TRIGGER_PIN, LOW);

  // Mede a duraçao do pino ECHO
  duration = pulseIn(ECHO_PIN, HIGH);

  // Calcula a distancia em centimetros usando a formula d = (t 8 v) / 2
  distance = (duration * 0.0343) / 2;

  //Exibe a distancia no Monitor Serial
  Serial.print("Valocidade: ");
  Serial.print(int (distance));
  Serial.println(" Km");

  client.publish("TOPICO_ESTEIRA_2",  String(int(distance)).c_str());
  Serial.println("---");
  delay(2000); // Wait for a new reading from the sensor (DHT22 has ~0.5Hz sample rate)
}


void loop() {
    reconnect();
    Conectado_Wifi();
    Conectado_Mosquito();
    envio_temp();
}