Current Sensor for Arduino

current-measure.ino

#include <Filter.h>
#include "U8glib.h"

#define RST 8   // Reset
#define CE 9    // CS
#define DC 10   // A0
#define DIN 11  // MOSI
#define CLK 12  // SCLK

#define CURR 0
#define VOLT 1

ExponentialFilter<long> ADCFilter(25, 0);
U8GLIB_PCD8544 u8g(CLK, DIN, CE, DC, RST);

void setup() {
  Serial.begin(9600);

  ADCFilter.SetCurrent(analogRead(CURR));
}

int roll5AvgValues[5];
int roll5AvgValue = 0;

int roll5Avg(int value) {
  roll5AvgValues[0] = roll5AvgValues[1];
  roll5AvgValues[1] = roll5AvgValues[2];
  roll5AvgValues[2] = roll5AvgValues[3];
  roll5AvgValues[3] = roll5AvgValues[4];
  roll5AvgValues[4] = value;
  
  roll5AvgValue = (roll5AvgValues[0] + roll5AvgValues[1] + roll5AvgValues[2] + roll5AvgValues[3] + roll5AvgValues[4]) / 5;
  return roll5AvgValue;
}

void loop() { 
  int rawCurrentValue = analogRead(CURR);
  int rawVoltageValue = analogRead(VOLT);
  
  ADCFilter.Filter(rawCurrentValue);

  float currentValue = (float) map(ADCFilter.Current() - 512, 0, 1023, 0, 5000) / (float) 185;
  float voltageValue = (float) map(rawVoltageValue, 0, 1023, 0, 20000) / (float) 1000; //20v
  
  float powerValue = currentValue * voltageValue;
  
  Serial.print(rawVoltageValue);
  Serial.print("\t");
  Serial.println(currentValue);

//  char buffer[20];
//  dtostrf(currentValue, 2, 2, buffer);

  u8g.firstPage();  
  do {

    u8g.setFont(u8g_font_7x14);

    int x = 0;
    int y = u8g.getFontLineSpacing();
    
    u8g.setPrintPos(x, y);
    u8g.print(currentValue, 2);
    u8g.print(" Amps");

    y += u8g.getFontLineSpacing();
    
    u8g.setPrintPos(x, y);
    u8g.print(voltageValue, 2);
    u8g.print(" Volts");

    y += u8g.getFontLineSpacing();
    
    u8g.setPrintPos(x, y);
    u8g.print(powerValue, 2);
    u8g.print(" Watts");
    
  } while( u8g.nextPage() );
 
  delay(250);
}