//#include <ThingSpeak.h>
#include <ESP8266WiFi.h>

//////////////////////////////

const int trigPin = 12;
const int echoPin = 14;

//define sound velocity in cm/uS
#define SOUND_VELOCITY 0.034
#define CM_TO_INCH 0.393701

long duration;
float distanceCm;
float distanceInch;
//////////////////////////////
//Wifi config
const char* ssid = "Fatimah";   //Input here your network SSID(name)
const char* pass = "123456789";

//ThingSpeak config
//unsigned long myChannelNumber = 2168066; //Input here your channel number
//const char * myWriteAPIKey = "Y86LIUY1H210Q8FK"; // Paste here your ThingSpeak Write API Key

const char* host = "maker.ifttt.com";


const int buzzer = D7;
const int ledPin = D8;


int safetyDistance = 30;

void setup() {

  WiFi.begin(ssid, pass);
  pinMode(trigPin, OUTPUT); // Sets the trigPin as an Output
  pinMode(echoPin, INPUT); // Sets the echoPin as an Input

  pinMode(buzzer, OUTPUT);
  pinMode(ledPin, OUTPUT);
  Serial.begin(9600); // Starts the serial communication

  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }

  Serial.println("IP address: ");
  Serial.println(WiFi.localIP());
  getDistanceAndShow();
}

void loop() {
  getDistanceAndShow();
  WiFiClient  client;
  const int httpPort = 80;
  if (!client.connect(host, httpPort)) {
    Serial.println("connection failed");
    return;
  }
  safetyDistance = distanceCm;
  if (safetyDistance <= 10) {

    digitalWrite(buzzer, HIGH);
    digitalWrite(ledPin, HIGH);

    String url = "/trigger/Alert/with/key/krVWdWa8GJn8-Q9yAbqKNirgfQqaYxM68vd3eJQLUuK";

    Serial.print("Requesting URL: ");
    Serial.println(url);

    client.print(String("GET ") + url + " HTTP/1.1\r\n" +
                 "Host: " + host + "\r\n" +
                 "Connection: close\r\n\r\n");
  }
  else {
    digitalWrite(buzzer, LOW);
    digitalWrite(ledPin, LOW);
  }
  /*
    int x = ThingSpeak.writeField(myChannelNumber, 1, distance, myWriteAPIKey);

    if(x == 200){
     Serial.println("Channel update successful.");
    }
    else{
     Serial.println("Problem updating channel. HTTP error code " + String(x));
    }*/
}

void getDistanceAndShow() {
  // Clears the trigPin
  digitalWrite(trigPin, LOW);
  delayMicroseconds(2);
  // Sets the trigPin on HIGH state for 10 micro seconds
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);

  // Reads the echoPin, returns the sound wave travel time in microseconds
  duration = pulseIn(echoPin, HIGH);

  // Calculate the distance
  distanceCm = duration * SOUND_VELOCITY / 2;

  // Convert to inches
  distanceInch = distanceCm * CM_TO_INCH;

  // Prints the distance on the Serial Monitor
  Serial.print("Distance (cm): ");
  Serial.println(distanceCm);
  delay(1000);
}