/*SPEED BREAKER NOTIFIER

problem solved: while traveling in highspeed, sometimes the speedbreakers are not noticed,
here, ultrasonic sensors detect the speedbreaker at a particular distance prior and notifies
the driver which can be viewed in car display

here ,when the first and second sensor get their minimum distance less then
16M and 14M respectively(which shows the upper slope of speed breaker) , a message 
will be sent to user through twilio

note: 
  the speedbreaker prediction cannot be highly accurate in real life
  when using ultrasonic sensor , so I concluded assuming we will use IR sensor in 
  reallife applications for more accuracy in this case

*/


#include <WiFi.h>
#include "base64.h"
#include <HTTPClient.h>

const char* WIFI_NAME="Wokwi-GUEST";        
const char* WIFI_PASSWORD = "";  

// Define pin numbers
const int ledPin = 6; // LED pin

// Pins for first ultrasonic sensor
const int trigPin1 = 28; // Trigger pin of first ultrasonic sensor
const int echoPin1 = 27; // Echo pin of first ultrasonic sensor

// Pins for second ultrasonic sensor
const int trigPin2 = 22; // Trigger pin of second ultrasonic sensor
const int echoPin2 = 21; // Echo pin of second ultrasonic sensor

//Crenditals for Twilio (Messaging)
const char* accountSid = "AC377a3bfd71346982e58684676c026faa";  
const char* authToken = "ee75f40174abea28b292f94e949f2b94";
const char* fromPhoneNumber = "+13343779718";
const char* toPhoneNumber = "+918122667959";

void setup() {
  // Initialize serial communication
  Serial1.begin(115200);


  // Set the LED pin as an OUTPUT
  pinMode(ledPin, OUTPUT);

  // Set the pins for first ultrasonic sensor
  pinMode(trigPin1, OUTPUT);
  pinMode(echoPin1, INPUT);

  // Set the pins for second ultrasonic sensor
  pinMode(trigPin2, OUTPUT);
  pinMode(echoPin2, INPUT);

   WiFi.begin(WIFI_NAME,WIFI_PASSWORD);
  while (WiFi.status()!=WL_CONNECTED){
    delay(1000);
    Serial1.print("Wifi not connected...\n");
  }
  Serial1.println("\nWifi connected");
  Serial1.println("IP Address: "+(WiFi.localIP()));
  WiFi.mode(WIFI_STA);
}

void loop() {
  // Read distance from first ultrasonic sensor
  long duration1, distance1;
  digitalWrite(trigPin1, LOW);
  delayMicroseconds(2);
  digitalWrite(trigPin1, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin1, LOW);
  duration1 = pulseIn(echoPin1, HIGH);
  distance1 = duration1 * 0.034 / 2;

  // Read distance from second ultrasonic sensor
  long duration2, distance2;
  digitalWrite(trigPin2, LOW);
  delayMicroseconds(2);
  digitalWrite(trigPin2, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin2, LOW);
  duration2 = pulseIn(echoPin2, HIGH);
  distance2 = duration2 * 0.034 / 2;

  // Print ultrasonic sensor readings
  Serial1.print("Distance 1: ");
  Serial1.print(distance1);
  Serial1.println(" m");

  Serial1.print("Distance 2: ");
  Serial1.print(distance2);
  Serial1.println(" m");

  // Turn on the LED if conditions are met
  if (distance1 < 16 && distance2 < 15) {
    digitalWrite(ledPin, HIGH);
    Serial1.println("speed breaker ahead by 15 M");

      // Encode the Twilio credentials
  String credentials = String(accountSid) + ":" + String(authToken);
  String encodedCredentials = base64::encode(credentials);

  String messageBody = "speed breaker ahead by 15 M";

  // Create the URL for the Twilio API
  String url = "https://api.twilio.com/2010-04-01/Accounts/" + String(accountSid) + "/Messages.json";

  // Create the POST data
  String postData = "To=" + String(toPhoneNumber) + "&From=" + String(fromPhoneNumber) + "&Body=" + messageBody;

  // Create and configure the HTTP client for Twilio
  HTTPClient http;
  http.begin(url);
  http.addHeader("Authorization", "Basic " + encodedCredentials);
  http.addHeader("Content-Type", "application/x-www-form-urlencoded");

   int httpCode = http.POST(postData);     //Sending the message once the heartRate is above the threshold.
      
      if (httpCode == HTTP_CODE_OK) {
        ;
    } 

    // Close the connection
    http.end();
  } else {
    digitalWrite(ledPin, LOW);
  }

  // Delay for a second
  delay(1000); 
}