#include <SPI.h> 
#include <Wire.h> 
#include <Adafruit_GFX.h> 
#include <Adafruit_SSD1306.h> 
#include <WiFi.h>
#include "secrets.h"
#include "ThingSpeak.h"

const int trigPin = 19; 
const int echoPin = 18; 
 
//define sound speed in cm/us 
#define SOUND_SPEED 0.034 
#define CM_TO_INCH 0.393701 
 
long duration; 
float distanceCm; 
float distanceInch; 
 
 
#define SCREEN_WIDTH 128 // OLED display width, in pixels 
#define SCREEN_HEIGHT 64 // OLED display height, in pixels 
 
// Declaration for SSD1306 display connected using I2C 
#define OLED_RESET     -1 // Reset pin # (or -1 if sharing Arduino reset pin) 
#define SCREEN_ADDRESS 0x3C 
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET); 
 
int piezoPin = 26;
 
void setup() { 
  // put your setup code here, to run once: 
 Serial.begin(115200);

  pinMode(trigPin, OUTPUT); // Sets the trigPin as an Output 
  pinMode(echoPin, INPUT); // Sets the echoPin as an Input 
  pinMode(27, INPUT_PULLUP);
   Serial.begin(115200); 
   Serial.println("hello buzz!");
   pinMode(piezoPin, OUTPUT);
 
  // SSD1306_SWITCHCAPVCC = generate display voltage from 3.3V internally 
  if(!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)) {  
    Serial.println(F("SSD1306 allocation failed")); 
    for(;;); // Don't proceed, loop forever 
  } 
 
  // Show initial display buffer contents on the screen -- 
  // the library initializes this with an Adafruit splash screen. 
  display.display(); 
  delay(2000); // Pause for 2 seconds 
 
  // Clear the buffer 
  display.clearDisplay(); 
 
 
  }

void loop() {
  Serial.println("Hello, ESP32!");

  int a=digitalRead(27);
  Serial.println(a);
  if(a==HIGH)
  {

    Serial.println("motion detected");

  
  tone(piezoPin, 1000, 500);
  delay(5000);
  
  }

  if(a==LOW)
   {
    Serial.println("motion not detected");
   }
  
  
  
  // Clears the trigPin
  digitalWrite(trigPin, LOW); 
   delayMicroseconds(2);
  // Sets the trigPin on HIGH state for 10 micro seconds  digitalWrite(trigPin, HIGH);
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);  
  digitalWrite(trigPin, LOW);


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

  // Calculating the distance  distanceCm = duration * 0.034 / 2;
  //Convert to inches
  distanceCm = duration * 0.034 / 2;

  distanceInch = distanceCm * CM_TO_INCH;  // Prints the distance on the Serial Monitor
  
  Serial.print("Distance (cm): ");  
  Serial.println(distanceCm);
Serial.print("Distance (inch): "); 
 Serial.println(distanceInch);


 display.clearDisplay();

  display.setTextSize(2);             // Normal 1:1 pixel scale
  display.setTextColor(WHITE);        // Draw white text  display.setCursor(0,0);
  display.setCursor(0,0);             // Start at top-left corner
  display.println(F("Distance:")); 
   display.print(distanceCm);
  display.println(F("cm")); 
   display.print(distanceInch);
  display.println(F("inch"));


  display.display(); 
   delay(2000);

   tone(piezoPin, 1000, 500);
}