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//Programa: Medidor de corrente com sensor ACS712
//Autor: Arduino e Cia

#include <Wire.h>
#include <U8glib.h>

//Definicoes do display Oled
U8GLIB_SSD1306_128X64 u8g(U8G_I2C_OPT_NONE);

//int valor = 0;
String str;
int tamanho;

const int analogIn = A0;
int mVperAmp = 66; 
int RawValue = 0;
int ACSoffset = 2500;
double Voltage = 0;
double Amps = 0;

void draw()
{
  //Comandos graficos para o display devem ser colocados aqui
  u8g.drawRFrame(0, 16, 128, 48, 4);
  u8g.drawRFrame(0, 0, 128, 16, 4);
  u8g.setFont(u8g_font_8x13B);
  u8g.setColorIndex(0);
  u8g.setColorIndex(1);
  u8g.drawStr( 20, 13, "Corrente (A)");
  u8g.setFont(u8g_font_fur25);
  str = String(Amps);
  tamanho = str.length();
  u8g.setPrintPos(64 - (tamanho * 10), 53);
  u8g.print(Amps,3);
}

void setup(void)
{
  Serial.begin(9600);
  Serial.println("Sensor de Corrente ACS712"); Serial.println("");
  Serial.println("");
  if ( u8g.getMode() == U8G_MODE_R3G3B2 ) {
    u8g.setColorIndex(255);     // white
  }
  else if ( u8g.getMode() == U8G_MODE_GRAY2BIT ) {
    u8g.setColorIndex(3);         // max intensity
  }
  else if ( u8g.getMode() == U8G_MODE_BW ) {
    u8g.setColorIndex(1);         // pixel on
  }
  else if ( u8g.getMode() == U8G_MODE_HICOLOR ) {
    u8g.setHiColorByRGB(255, 255, 255);
  }
}

void loop(void)
{
  Calcula_corrente();
  //Chama a rotina de desenho na tela
  u8g.firstPage();
  do
  {
    draw();
  }
  while ( u8g.nextPage() );
  delay(150);
}

void Calcula_corrente()
{
  RawValue = analogRead(analogIn);
  Voltage = (RawValue / 1024.0) * 5000; // Gets you mV
  Amps = ((Voltage - ACSoffset) / mVperAmp);
  delay(2000);
}