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

#define TRIG_PIN 17
#define ECHO_PIN 16

#define SCREEN_WIDTH 128
#define SCREEN_HEIGHT 64

Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, -1);

void setup() {
  pinMode(TRIG_PIN, OUTPUT);
  pinMode(ECHO_PIN, INPUT);

  if (!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)) {
    while (true); // Si falla la pantalla, queda en bucle
  }

  display.clearDisplay();
  display.setTextSize(2); 
  display.setTextColor(SSD1306_WHITE);
}

void loop() {

  digitalWrite(TRIG_PIN, LOW);
  delayMicroseconds(2);
  digitalWrite(TRIG_PIN, HIGH);
  delayMicroseconds(10);
  digitalWrite(TRIG_PIN, LOW);

  long duration = pulseIn(ECHO_PIN, HIGH);
  float distance = (duration * 0.0344) / 2;

  char buffer[10];
  dtostrf(distance, 6, 2, buffer);  


  display.clearDisplay();
  display.setCursor(10, 10); 
  display.print("DISTANCIA");
  display.setCursor(10, 35); 
  display.print(buffer);
  display.print(" cm");

  display.display();

  delay(1000);
}