#include <WiFi.h>
//#include <ThingSpeak.h>
const char apiKey[] = "5V6YO5M7DJFR3SOD"; // write your "Write API key"
const char* ssid = "Wokwi-GUEST"; // write your "wifi name"
const char* password = ""; // write your "wifi password"
//const char* ssid = "mugil";
//const char* password = "12345678";
#define ir_car1 5
#define ir_car2 6
#define ir_car3 7
#define ir_car4 8

const char* server = "api.thingspeak.com";
long myChannelNumber = 2457760;
int S1=0, S2=0, S3=0, S4=0 ;
String p1;
String p2;
String p3;
String p4;

int avail= 4;
int slot = 4;
int valSensor = 4;
WiFiClient client;
void setup() 
{
  Serial.begin(9600);
  Serial.println("Serial Begin");
  
        
  WiFi.begin(ssid, password);
  Serial.println();
  Serial.println();
  Serial.print("Connecting to ");
  Serial.println(ssid);
        
        
  while (WiFi.status() != WL_CONNECTED)
  {
    delay(500);
    Serial.print(".");
  }
    Serial.println("");
    Serial.println("WiFi connected");
    //ThingSpeak.begin(client);
}

void loop() {
  valSensor = getSensorData();
  Serial.println(valSensor);
  //ThingSpeak.writeField(myChannelNumber, 1, Temp, apiKey);
  //ThingSpeak.writeField(myChannelNumber, 2, Hum, apiKey);
  //Serial.println("Waiting");
  delay(1500);
}

void Read_Sensor(){
  S1=0, S2=0, S3=0, S4=0;
  if(digitalRead(ir_car1) == 0){
    S1=1;
  }
  if(digitalRead(ir_car2) == 0){
    S2=1;
  }
  if(digitalRead(ir_car3) == 0){
    S3=1;
  }
  if(digitalRead(ir_car4) == 0){
    S4=1;
  }
}

int getSensorData(){
  Read_Sensor();
  String p1="";
  String p2="";
  String p3="";
  String p4="";
  if(S1==1)
  {
    Serial.print(" S1:Fill ");
    p1="1";
  }
  else
  {
    Serial.print(" S1:Empty");
    p1="0";
  }
  if(S2==1)
  {
    Serial.print(" S2:Fill ");
    p2="1";
  }
  else
  {
    Serial.print(" S2:Empty");
    p2="0";
  }
  if(S3==1)
  {
    Serial.print(" S3:Fill ");
    p3="1";
  }
  else
  {
    Serial.print(" S3:Empty");
    p3="0";
  }
  if(S4==1)
  {
    Serial.print(" S4:Fill ");
    p4="1";
  }
  else
  {
    Serial.print(" S4:Empty");
    p4="0";
  }
  int total = S1+S2+S3+S4;
  slot = avail-total;
  String ans="1"+p1+p2+p3+p4;
  return slot;
}