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

#define PIN_TRIG 26
#define PIN_ECHO 27
#define SCREEN_WIDTH 128
#define SCREEN_HEIGHT 64

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

const float speedSound = 34000.0;
 
float distance;

void setup() {
  Serial.begin(115200);
  pinMode(PIN_TRIG, OUTPUT);
  pinMode(PIN_ECHO, INPUT);
  //display.setTextColor(WHITE);
}

void loop() {
  startTrigger();
  unsigned long time = pulseIn(PIN_ECHO, HIGH);

  distance = time * 0.000001 * speedSound / 2.0;
  Serial.print(distance);
  Serial.print("cm");
  Serial.println();
  delay(1000);
  /*display.clearDisplay();
  display.setTextSize(2); display.setCursor(0, 10);
  display.print("Distance");
  display.setTextSize(4); display.setCursor(0, 40);
  display.print((distance), 1);
  //display.print("cm");
 
  display.setTextSize(1); display.setCursor(0, 55);
  display.print("Distance Inches ");
  display.setTextSize(2); display.setCursor(90, 50);
  display.print((duration / 148));

  display.display();*/
  delay(1000);
}

void startTrigger()
{
  digitalWrite(PIN_TRIG, LOW);
  delayMicroseconds(2);
  
  digitalWrite(PIN_TRIG, HIGH);
  delayMicroseconds(10);
  
  digitalWrite(PIN_TRIG, LOW);
}