#include <LiquidCrystal_I2C.h>
#include <WiFi.h>
#include <ThingSpeak.h>

int trigg_1=25;
int trigg_2=23;
int trigg_3=32;
int echo_1=26;
int echo_2=4;
int echo_3=33;
int buzzer=14;
float distance1;
float distance2;
float distance3;

char ssid[] = "Wokwi-GUEST"; //wifi id
char pass[] = ""; //wifi password
int statuscode;
long myChannelNumber =2623640; //thingspeak channel number
const char * myWriteAPIKey = "83PLM7HSPDJWIWA4"; //thingspeak mywrite_apikey


WiFiClient client; //wifi client
LiquidCrystal_I2C lcd(0x27, 16, 2); //setting lcd(16x2)




void setup() {
  lcd.init(); // initialize the lcd
  lcd.backlight();
 
  Serial.begin(115200);
  pinMode(trigg_1,OUTPUT);
  pinMode(trigg_2, OUTPUT);
  pinMode(trigg_3, OUTPUT);
  pinMode(echo_1, INPUT);
  pinMode(echo_2, INPUT);
  pinMode(echo_3, INPUT);
  pinMode(buzzer, OUTPUT);

  WiFi.mode(WIFI_STA); //wifi setup 
      
  if(WiFi.status() != WL_CONNECTED) {//checking connection for wifi
    Serial.print("Attempting to connect");

    while(WiFi.status() != WL_CONNECTED) {
       WiFi.begin(ssid, pass); 
       Serial.print(".");
       delay(5000);
    }

    Serial.println("\nConnected.");
  }

  ThingSpeak.begin(client); //connecting wifi to thingspeak
}

int ultra_1(){   //getting utrasonic_1 sensor data
  digitalWrite(trigg_1, LOW);
  delay(10);
  digitalWrite(trigg_1,HIGH);
  delay(100);
  digitalWrite(trigg_1,LOW);
  distance1 = pulseIn(echo_1,HIGH);
  return(distance1*0.034/2);

}

int ultra_2(){ //getting utrasonic_2 sensor data
  digitalWrite(trigg_2, LOW);
  delay(10);
  digitalWrite(trigg_2,HIGH);
  delay(100);
  digitalWrite(trigg_2,LOW);
  distance2 = pulseIn(echo_2,HIGH);
  return(distance2*0.034/2);

}

int ultra_3(){  //getting utrasonic_3 sensor data
  digitalWrite(trigg_3, LOW);
  delay(10);
  digitalWrite(trigg_3,HIGH);
  delay(100);
  digitalWrite(trigg_3,LOW);
  distance3 = pulseIn(echo_3,HIGH);
  return(distance3*0.034/2);

}


void loop() {
  // giving ultrasonic value to variables
 int blind_1 = ultra_1();
 int blind_2 = ultra_2();
 int blind_3 = ultra_3();



 if(blind_1<=250){
 
   tone(buzzer,500);
   noTone(buzzer);


   lcd.clear();
   lcd.setCursor(2,0);  // (0,0) => (row,column) of lcd
   lcd.println("Danger ahead");

   delay(1000);
 
   lcd.clear();
   lcd.setCursor(6,0);
   lcd.println("turn");

   lcd.setCursor(2,1);
   lcd.println("left or right");
   delay(1000);

  
   if(blind_2 > 250 ){
     noTone(buzzer);
     lcd.clear();              // clear display
     lcd.setCursor(3,0);      // move cursor to   (0, 0)
     lcd.println("turn right");
  
    }
   
    else if(blind_3 > 250){
     noTone(buzzer);
     lcd.clear();
     lcd.setCursor(3,0);
     lcd.println("turn left");   
    }

   else{
     noTone(buzzer);
     lcd.clear();
     lcd.setCursor(0,0);
     lcd.print("There is no way");
     lcd.setCursor(2,1);
     lcd.print("Turn around");
     delay(2000);
    }
}

 else {
   lcd.clear();
   lcd.setCursor(2,0);
   lcd.println("Safe to go");
   noTone(buzzer);

  }

 //set feilds for ultrasonic

ThingSpeak.setField(1,blind_1);
// ThingSpeak.setField(2,blind_2);
// ThingSpeak.setField(3,blind_3);

//writing values into thinkspeak through myChannelNumber, myWriteAPIKey
 int statusCode = ThingSpeak.writeField(myChannelNumber,1,blind_1,myWriteAPIKey);

//checking if values whether send to thingspeak or not

  if(statusCode==200){
    Serial.println("Channel update successful.");
  }

  else {
    Serial.println("Problem Writing data. HTTP error code :" +
String(statusCode));
}

delay(5000);

}