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


#define SCREEN_WIDTH 128 // OLED display width, in pixels
#define SCREEN_HEIGHT 64
#define OLED_RESET     -1 // Reset pin # (or -1 if sharing Arduino reset pin)

#define SCREEN_ADDRESS 0x3C ///< See datasheet for Address; 0x3D for 128x64, 0x3C for 128x32

Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);


#include "EmonLib.h"                   // Include Emon Library

EnergyMonitor emon1;                   // Create an instance

double Irmsvalue = 0;

void setup() {

  display.begin(SSD1306_SWITCHCAPVCC, 0x3C); //장치초기화

  Serial.begin(9600);
  display.clearDisplay();
  display.setTextSize(2);
  display.setTextColor(WHITE);

  emon1.current(0, 30);

  for (int i = 0; i < 10; i++) {

    Irmsvalue += emon1.calcIrms(1480);
  }
  Irmsvalue /= 10;

}

void loop() {

  double Irms = emon1.calcIrms(1480); // - Irmsvalue;

  if (Irms < 0) Irms = 0;

  double Watt = Irms * 220 * 0.95;
  Serial.print(Irms);   Serial.print("  ");  Serial.println(Watt);

  display.setCursor(1, 0);  display.print(Irms);  display.println(" A");
  display.setCursor(1, 18); display.print(Watt);  display.println(" W");
  
  display.setCursor(1, 36); display.print(Irmsvalue);  display.println(" i");

  display.display();
  delay(100);
  display.clearDisplay();

}
//[출처] 전류값이 왜 나타나는지 궁금합니다. (아두이노  스토리) | 작성자 병화용신