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

#define LEBAR_LAYAR 128 // Lebar layar OLED yang digunakan
#define TINGGI_LAYAR 64 // Tinggi layar OLED yang digunakan

int ECHO_PIN = 26;
int TRIG_PIN = 25;
int ledH = 27;
int ledK = 14;
int ledM = 12;
Adafruit_SSD1306 oled(LEBAR_LAYAR, TINGGI_LAYAR, &Wire, -1);


void setup() {
 Serial.begin(9600);

  pinMode(ECHO_PIN, INPUT);
  pinMode(TRIG_PIN, OUTPUT);
  pinMode(ledH, OUTPUT);
  pinMode(ledK, OUTPUT);
  pinMode(ledM, OUTPUT);

  // initialize OLED display with I2C address 0x3C
  if (!oled.begin(SSD1306_SWITCHCAPVCC, 0x3C)) {
    Serial.println(F("failed to start SSD1306 OLED"));
    while (1);
  }

  delay(3000);         
  oled.clearDisplay();

  oled.setTextSize(1);         // Atur ukuran text
  oled.setTextColor(WHITE);    // Atur warna text
  oled.setCursor(0, 2);       // Atur posisi text pada display
  oled.println("ALEX"); // Text yang dicetak
  oled.display();              // menampilkan display OLED

  oled.clearDisplay(); // clear display


}

float ultrasonik(){
  digitalWrite(TRIG_PIN, LOW);
  delayMicroseconds(2);
  digitalWrite(TRIG_PIN, HIGH);
  delayMicroseconds(10);
  digitalWrite(TRIG_PIN, LOW);
  int duration = pulseIn(ECHO_PIN, HIGH);
  return duration * 0.034 / 2;
}

void loop() {
  // put your main code here, to run repeatedly:
    delay(3000);         
    oled.clearDisplay();
  float jarak = ultrasonik();
  if(jarak > 150){
    digitalWrite(ledH, HIGH);
    digitalWrite(ledK, LOW);
    digitalWrite(ledM, LOW);
    Serial.println("Jarak Air Rendah");
    Serial.print("Nilai Jarak :");
    Serial.print(jarak);
    Serial.println("cm     ");
    oled.setTextSize(1);         // Atur ukuran text
    oled.setTextColor(WHITE);    // Atur warna text
    oled.setCursor(0, 2);       // Atur posisi text pada display
    oled.println("Jarak Air: Rendah"); // Text yang dicetak
    oled.display(); 
    delay(100);
  }
  else if(jarak <= 150 && jarak > 75){
    digitalWrite(ledK, HIGH);
    digitalWrite(ledH, LOW);
    digitalWrite(ledM, LOW);
    Serial.println("Jarak Air Sedang");
    Serial.print("Nilai Jarak :");
    Serial.print(jarak);
    Serial.println("cm     ");
    oled.setTextSize(1);         // Atur ukuran text
    oled.setTextColor(WHITE);    // Atur warna text
    oled.setCursor(0, 2);       // Atur posisi text pada display
    oled.println("Jarak Air: Sedang"); // Text yang dicetak
    oled.display(); 
    delay(100);
  }
  else if(jarak <= 75){
    digitalWrite(ledM, HIGH);
    digitalWrite(ledK, LOW);
    digitalWrite(ledH, LOW);
    Serial.println("Jarak Air Tinggi");
    Serial.print("Nilai Jarak :");
    Serial.print(jarak);
    Serial.println("cm     ");
    oled.setTextSize(1);         // Atur ukuran text
    oled.setTextColor(WHITE);    // Atur warna text
    oled.setCursor(0, 2);       // Atur posisi text pada display
    oled.println("Jarak Air: Tinggi"); // Text yang dicetak
    oled.display(); 
    delay(100);
  }
}