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

// Define the pins for the ultrasonic sensor
const int trigPin = 14;
const int echoPin = 27;

// Create an instance of the OLED display
#define SCREEN_WIDTH 128
#define SCREEN_HEIGHT 64
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, -1);

void setup() {
  Serial.begin(115200);
  
  // Initialize the ultrasonic sensor pins
  pinMode(trigPin, OUTPUT);
  pinMode(echoPin, INPUT);
  
  // Initialize the OLED display
  display.begin(SSD1306_SWITCHCAPVCC, 0x3C);
  display.clearDisplay();
  display.setTextSize(1);
  display.setTextColor(SSD1306_WHITE);
  display.setCursor(0, 0);
  display.print("Ultrasonic Distance");
  display.display();
  delay(2000); // Display the message for 2 seconds
}

void loop() {
  // Clear the previous readings
  display.clearDisplay();
  
  // Trigger the ultrasonic sensor
  digitalWrite(trigPin, LOW);
  delayMicroseconds(2);
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);
  
  // Read the echo pin
  long duration = pulseIn(echoPin, HIGH);
  
  // Calculate distance in cm
  int distance = duration * 0.034 / 2; // Speed of sound is 0.034 cm/microsecond

  // Display the distance on the OLED
  display.setCursor(0, 0);
  display.print("Distance: ");
  display.print(distance);
  display.print(" cm");
  
  display.display();
  
  // Wait before the next measurement
  delay(500);
}