arduinoultrasonic

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

// OLED settings
#define SCREEN_WIDTH 128
#define SCREEN_HEIGHT 64
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, -1);

// Ultrasonic sensor pins
#define TRIG_PIN 9
#define ECHO_PIN 8

void setup() {
  // Start serial and OLED
  Serial.begin(9600);

  if(!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)) { // I2C address 0x3C
    Serial.println(F("SSD1306 allocation failed"));
    while(1);
  }
  display.clearDisplay();
  display.setTextColor(SSD1306_WHITE);

  // Setup ultrasonic pins
  pinMode(TRIG_PIN, OUTPUT);
  pinMode(ECHO_PIN, INPUT);
}

void loop() {
  long duration;
  float distance;

  // Trigger the sensor
  digitalWrite(TRIG_PIN, LOW);
  delayMicroseconds(2);
  digitalWrite(TRIG_PIN, HIGH);
  delayMicroseconds(10);
  digitalWrite(TRIG_PIN, LOW);

  // Read echo time
  duration = pulseIn(ECHO_PIN, HIGH);
  distance = duration * 0.034 / 2; // Convert to cm

  // Display on OLED
  display.clearDisplay();
  display.setTextSize(2);
  display.setCursor(0, 10);
  display.print("Distance:");
  display.setTextSize(3);
  display.setCursor(0, 35);
  display.print(distance, 1);
  display.print(" cm");

  display.display();
  delay(300);
}