/* ESP32 WiFi Scanning example */

#include <WiFi.h>
#include "ThingSpeak.h"

const char* ssid = "Wokwi-GUEST";   
const char* password = "";   

WiFiClient  client;

unsigned long myChannelNumber = 1;
const char * myWriteAPIKey = "76HA1QDM4LUVOXEM";


unsigned long lastTime = 0;
unsigned long timerDelay = 10000;

const int trigPin = 5;
const int echoPin = 18;


#define VEL_SOM 0.034

long duracao;
float distanciaCm;


void setup() {
  Serial.begin(115200); 
  pinMode(trigPin, OUTPUT); 
  pinMode(echoPin, INPUT); 
  
  WiFi.mode(WIFI_STA);   
  
  ThingSpeak.begin(client);  

      if(WiFi.status() != WL_CONNECTED){
      Serial.print("Conectando...");
      while(WiFi.status() != WL_CONNECTED){
        WiFi.begin(ssid, password); 
        delay(5000);     
      } 
      Serial.println("\nConectado.");
    }
}

void loop() {

   digitalWrite(trigPin, LOW);
  delayMicroseconds(2);
  
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);
  
  
  duracao = pulseIn(echoPin, HIGH);
  
  
  distanciaCm = duracao * VEL_SOM/2;
  

  Serial.print("Distancia (cm): ");
  Serial.println(distanciaCm);
    
    
   
    int x = ThingSpeak.writeField(myChannelNumber, 1, distanciaCm, myWriteAPIKey);
    

    if(x == 200){
      Serial.println("Dado atualizado com sucesso.");
    }
    else{
      Serial.println("Problema atualizando. HTTP codigo do erro " + String(x));
    }

}