#include <SPI.h>
#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>
#define SCREEN_WIDTH 128 // OLED display width,  in pixels
#define SCREEN_HEIGHT 64 // OLED display height, in pixels5
// declare an SSD1306 display object connected to I2C
Adafruit_SSD1306 oled(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, -1);


int led = 2;

void lcd(){
  pinMode(led, OUTPUT);
  oled.begin(SSD1306_SWITCHCAPVCC, 0x3C);
  oled.clearDisplay();
  Serial.begin(9600);
  oled.clearDisplay(); // clear display
  oled.setTextSize(1);          // text size
  oled.setTextColor(WHITE);     // text color
  oled.setCursor(0, 10);        // position to display
 // oled.println("Hello World!"); // text to display
  oled.display();               // show on OLED
}

void setup() {
  lcd();
}

void sensor_tegangan(){
  int sensorValue = analogRead(2); // Membaca nilai ADC dari pin input
  float voltage = sensorValue * (3.3 / 4095); // Mengonversi nilai ADC ke tegangan
  
  Serial.println(sensorValue);
  Serial.print("V=  ");
  Serial.print(voltage);
  Serial.println(" V");
  oled.print("V= ");
  oled.print(voltage);
  oled.println("V\n");
  oled.display();
  delay(10000);
}

void loop() {
 
  sensor_tegangan();
}