#include <WiFi.h>
#include "Ultrasonic.h"
#include <ThingSpeak.h>
const char apiKey[] = "PP8RLXCLLNZCZTC5"; // write your "Write API key"
const char* ssid = "Wokwi-GUEST"; // write your "wifi name"
const char* password = ""; // write your "wifi password"
const char* server = "api.thingspeak.com";
long myChannelNumber = 2487633;

Ultrasonic u1(1,2);
Ultrasonic u2(4,5);
Ultrasonic u3(7,8);
int S1=0, S2=0, S3=0;
int avail= 3;
int slot = 3;
int valSensor = 3;
 
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.print("Available Slots:");
  Serial.println(valSensor);
  //Serial.println("Waiting");
  ThingSpeak.writeField(myChannelNumber, 1, valSensor, apiKey);
  delay(5000);
}

void Read_Sensor()
{
  S1=0, S2=0, S3=0;
  if(u1.read(CM) != 0 && u1.read(CM) <50)
  {
    S1=1;
  }
  if(u2.read(CM) != 0 && u2.read(CM) <50)
  {
    S2=1;
  }
  if(u3.read(CM) != 0 && u3.read(CM) <50)
  {
    S3=1;
  }
}
int getSensorData(){
  Read_Sensor();
  if(S1==1)
  {
    Serial.print(" S1:occupied ");
  }
  else
  {
    Serial.print(" S1:Empty    ");
  }
  if(S2==1)
  {
    Serial.print(" S2:occupied ");
  }
  else
  {
    Serial.print(" S2:Empty    ");
  }
  if(S3==1)
  {
    Serial.print(" S3:occupied ");
  }
  else
  {
    Serial.print(" S3:Empty    ");
  }
  int total = S1+S2+S3;
  slot = avail-total;
  return slot;
}