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

#define ECHO_PIN 16
#define TRIG_PIN 17

#define SCREEN_WIDTH 128
#define SCREEN_HEIGHT 64

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

void setup() {
  pinMode(35, OUTPUT);
  if (loled.begin(SSD1306_SWITCHCAPVCC, 0x3C)){
    Serial.println(F("failed to start SSD1306 OLED"));
    while (1);
  }

  delay(3000);
  oled.clearDisplay();

  oled.setTextSize(2);
  oled.setTextColor(WHITE);
  oled.setCursor(1,5);
  oled.println("PENGUKUR KETINGGIAN AIR - NAMA SISWA");
  oled.display();

  Serial.begin(9600);
  pinMode(ECHO_PIN, INPUT);
  pinMode(TRIG_PIN, OUTPUT);
}


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() {
  digitalWrite(35,LOW);
  delay(1000);
  digitalWrite(35, HIGH);
delay(3000);
oled.clearDisplay();

float jarak = ultrasonik();
if(jarak > 150){
  Serial.println("Air Rendah");
  Serial.print("Nilai Jarak");
  Serial.print(jarak);
  Serial.println("cm   ");
  oled.print(jarak);
  oled.println("cm   ");
  oled.setTextSize(1);
  oled.setTextColor(WHITE);
  oled.setCursor(0, 2);
  oled.println("Jarak Air: Rendah");
  oled.display();
  delay(1000);
}


else if(jarak <= 150 && jarak > 75){
  Serial.println("Air Sedang");
  Serial.print("Nilai Jarak");
  Serial.print(jarak);
  Serial.println("cm  ");
  oled.print(jarak);
  oled.println("cm  ");
  oled.setTextSize(1);
  oled.setTextColor(WHITE);
  oled.setCursor(0, 2);
  oled.println("Jarak Air: Sedang");
  oled.display();
  delay(1000);
}
else if (jarak <= 75){
  Serial.println("Air Tinggi");
  Serial.print("Nilai Jarak");
  Serial.print(jarak);
  Serial.println("cm  ");
  oled.print(jarak);
  oled.println(" cm  ");
  oled.setTextSize(1);
  oled.setTextColor(WHITE);
  oled.setCursor(0, 2);
  oled.println("Jarak Air: Tinggi");
  oled.display();
  delay(1000);
  }
}