/*
 * This ESP32 code is created by esp32io.com
  *
   * This ESP32 code is released in the public domain
    *
     * For more detail (instruction and wiring diagram), visit https://esp32io.com/tutorials/esp32-oled
      */

      #include <Wire.h>
      #include <Adafruit_GFX.h>
      #include <Adafruit_SSD1306.h>
      #include "WiFi.h"



      const int trigPin = 2;
      const int echoPin = 4;
      const int buzPin = 15;
      float duration;
      int distance;


      #define SCREEN_WIDTH 128 // OLED width,  in pixels
      #define SCREEN_HEIGHT 64 // OLED height, in pixels

      // create an OLED display object connected to I2C
      Adafruit_SSD1306 oled(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, -1);

      void setup() {
     Serial.begin(11520);

     pinMode(trigPin, OUTPUT);
     pinMode(echoPin, INPUT);
     pinMode(buzPin, OUTPUT);
     

    // initialize OLED display with I2C address 0x3C
    if (!oled.begin(SSD1306_SWITCHCAPVCC, 0x3C)) {
    Serial.println(F("failed to start SSD1306 OLED"));
    while (1);
    }

  delay(2000); // wait two seconds for initializing
  oled.clearDisplay(); // clear display

  oled.setTextSize(3);         // set text size
  oled.setTextColor(WHITE);    // set text color
  oled.setCursor(5, 15);       // set position to display
  oled.println("YODDHA"); // set text
  oled.display();
  delay(2000);
  oled.clearDisplay();
  oled.setTextSize(1.5);
  oled.setTextColor(WHITE);
  oled.setCursor(0,5);
  oled.print("Initialising Wifi");
  WiFi.mode(WIFI_STA);
  delay(500);
  oled.setCursor(0, 30);
  oled.print("Serup is done");
  oled.display();
  delay(1500);
  oled.clearDisplay();



 }

  void loop() {
  oled.setTextSize(1);
  oled.setCursor(0,10);
  oled.print("Scanning.....");
  oled.display();
  delay(100);
  int n = WiFi.scanNetworks();
  oled.clearDisplay();
  if (n == 0) {
  oled.print("No Networks found");
  oled.display();
  } else {
    oled.setCursor(0, 32);
    oled.print(n);
    oled.print("Networks Found ");
    oled.display();
    for (int i = 0; i<n; ++i) {
      oled.setCursor(0, 45);
      oled.print(i + 1);
      oled.print(";");
      oled.print(WiFi.SSID(i));
      oled.print("i");
      oled.print(WiFi.RSSI(i));
      oled.display();
      delay(10);

    }

  }
delay(100);


//ultrasonic sensor loop program 

digitalWrite(trigPin, LOW);
delayMicroseconds(2);
digitalWrite(trigPin, HIGH);
delayMicroseconds(10);
digitalWrite(trigPin, LOW);
duration = pulseIn(echoPin, HIGH);
distance = duration*0.034/2;

oled.setCursor(0, 55);
oled.print("Distance : ");
oled.print(distance);
oled.println(" cm");
oled.display();

delay(100);
if (distance<100)
{
  digitalWrite(buzPin, HIGH);
}
else
{
  digitalWrite(buzPin, LOW);
}
 }