//-- inisialisasi Koneksi WIFI
#include <WiFi.h>
#include <WiFiClient.h>

//-Inisialisasi Blynk
#include <BlynkSimpleEsp32.h>

#define BLYNK_PRINT Serial
#define BLYNK_TEMPLATE_ID "TMPLN1elUrsK"
#define BLYNK_DEVICE_NAME "I0T4 8"
#define BLYNK_AUTH_TOKEN "fxA5bSryRTGTB6_ngLyeYjdnOKFxWtBl"


//Auth
char auth[] = BLYNK_AUTH_TOKEN;
char ssid[] = "Wokwi-GUEST";
char pass[] = "";


//-- inisialisasi OLED 128X64 px
#include <Adafruit_SSD1306.h>
#include <Adafruit_GFX.h>

//const int lebar = 128;
//const int tinggi = 64;
//const int reset =4;

Adafruit_SSD1306 display(128, 64, &Wire, 4);

//-- inisialiasi sensor tegangan
#define sensor_pin 36

int sensor_raw;
float sensor_value;
float tegangan;
float R1 =30100; //nilai 30.1 Kilo Ohm
float R2 = 7500; // NILAI 7.5 ohm


void setup() {
  // put your setup code here, to run once:
  Serial.begin(9600);
 
  Blynk.begin(auth, ssid, pass);
  display.begin(SSD1306_SWITCHCAPVCC, 0x3C);
  display.clearDisplay();
  display.setTextColor(1);
  display.setTextSize(1);
  display.display();
  
}

void loop() {

   Blynk.run();
  sensor_raw = analogRead(sensor_pin);

  //Rumus pembagi tegangan
  sensor_value = sensor_raw = 3.3/4096;
  sensor_value = sensor_value / (R2/ (R2+R1));
  tegangan = sensor_value;
  tampilkan_tegangan_pada_oled();
  Serial.print("Tegangan : ");
  Serial.println(tegangan);

  //kirim data
  Blynk.virtualWrite(V0, tegangan); 
  delay(500);


}

void tampilkan_tegangan_pada_oled()
{

  display.begin(SSD1306_SWITCHCAPVCC, 0x3C);
  display.clearDisplay();
  display.setTextColor(1);
  display.setTextSize(1);
  display.setCursor(3,5);
  display.println("TEGANGAN :");
  display.setCursor(68,5);
  display.print(tegangan);
  display.setCursor(100,5);
  display.println("V");
  display.display();

}