//For wifi connection
#include <WiFi.h>
char ssid[] = "Wokwi-GUEST";
char pass[] = "";

//for HC sensor
int trigger=12;
int echo=14;
float distance;

// For thingspeak
#include <ThingSpeak.h>

WiFiClient client;
 long myChannelNumber =   2652879;
const char * myWriteAPIKey = "9FXSA6PUZ50I7PSW";
int statusCode;

void setup() {
  //For wifi connection
   Serial.begin(115200);
  WiFi.mode(WIFI_STA);

//for HC sensor
  Serial.begin(115200);
  pinMode(trigger, OUTPUT);
  pinMode(echo, INPUT);
  pinMode(23, OUTPUT);
  pinMode(22, OUTPUT);
  pinMode(21, OUTPUT);

// For thingspeak
  ThingSpeak.begin(client);

}

//FOR ULTARSONIC COMMAN CODE 

int ultraperformance(){
digitalWrite(trigger, LOW);
delay(100);
digitalWrite(trigger, HIGH);
delay(100);
digitalWrite(trigger,LOW);
distance=pulseIn(echo, HIGH);
return(distance*0.034/2)+1;
}


void loop() {
// For wifi code
 if(WiFi.status() != WL_CONNECTED)
  {
  Serial.print("Attempting to connect");
    while(WiFi.status() != WL_CONNECTED)
    {
    WiFi.begin(ssid, pass); 
    Serial.print(".");
    delay(5000);
    }
  Serial.println("\nConnected.");
  } 

// CONVERT ULTRAPERFORMANCE TO ACTUAL_DISTANCE 
 int actual_distance= ultraperformance();
 Serial.println(actual_distance);

 if (actual_distance<200){
  digitalWrite(23, HIGH);
  digitalWrite(22, LOW);
  digitalWrite(21, LOW);
 }

 else if (actual_distance>=200 && actual_distance<=300){
  digitalWrite(22, HIGH);
  digitalWrite(23, LOW);
  digitalWrite(21, LOW);
 }

 else if (actual_distance>300){
  digitalWrite(21, HIGH);
  digitalWrite(23, LOW);
  digitalWrite(22, LOW);
 }

 else{
  digitalWrite(23, LOW);
  digitalWrite(22, LOW);
  digitalWrite(21, LOW);
}
// For thingspeak
{
  // put your main code here, to run repeatedly:
  ThingSpeak.setField(1, actual_distance);

  statusCode = ThingSpeak.writeFields(myChannelNumber,myWriteAPIKey);

if(statusCode == 200) { //successful writing code
Serial.println("Channel update successful.");
}
else {
Serial.println("Problem Writing data. HTTP error code :" +
String(statusCode));
}
}
 }