#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>
Adafruit_SSD1306 display = Adafruit_SSD1306(128, 64, &Wire);

#define PIN_TRIG 18
#define PIN_ECHO 19
long duration;
int distance;

void setup() {
  Serial.begin(115200);
  pinMode(PIN_TRIG, OUTPUT);
  pinMode(PIN_ECHO, INPUT); 
  
  digitalWrite(PIN_TRIG, LOW);
  delayMicroseconds(2);
  digitalWrite(PIN_TRIG,HIGH);
  delayMicroseconds(10);
  digitalWrite(PIN_TRIG,LOW);
  duration = pulseIn(PIN_ECHO,HIGH);
  distance = duration *0.034/2;

  Serial.print("ระยะทาง เท่ากับ");
  Serial.println(distance);
  delay(500);
  
  display.begin(SSD1306_SWITCHCAPVCC, 0x3c);
  display.clearDisplay();
  display.setTextColor(WHITE, BLACK);
  display.setCursor(0, 0);
  display.print("distance ="+String(distance));
  display.display(); 
}

void loop() {
  digitalWrite(PIN_TRIG, LOW);
  delayMicroseconds(2);
  digitalWrite(PIN_TRIG,HIGH);
  delayMicroseconds(10);
  digitalWrite(PIN_TRIG,LOW);
  duration = pulseIn(PIN_ECHO,HIGH);
  distance = duration *0.034/2;

  Serial.print("ระยะทาง เท่ากับ");
  Serial.println(distance);
  delay(500);
  
  display.setCursor(0, 0);
  display.clearDisplay();
  display.print("distance ="+String(distance));
  display.display();
  delay(100); 
}