積算電流計2

CurrentIntegrator2.ino

// 2016/08/10 積算電流計
// このスケッチは戸田よろず研究所の積算電流計を使わせていただいております。
// Stand-alone Current Integrator by Toda Yorzu Kenkyujyo
//http://tyk-systems.com/CurrentIntegrator/CurrentIntegrator.html
//
//2016/08/11
//手持ちのLCDシールドにあわせてスケッチの一部変更。
//スケッチの若干の修正。

#include <LiquidCrystal.h>  // include LCD driver
#define ResetPin 12  //* To define Digital 9 pin as input
#define analogPin 3 // To define analog 3 pin as input

//* LiquidCrystal(rs, enable, d4, d5, d6, d7)
LiquidCrystal lcd(7, 6, 8, 9, 10, 11);//*

unsigned long time1 = 0; // time in msec unit
unsigned long time2 = 0; // time2 in msec unit
unsigned long time3 = 0; // time3 in msec unit
unsigned long timeForAverage = 1000; // nearly=1000 msec, time for average Current
unsigned long SecNow = 0; // time in second unit
unsigned long MeasN = 0; // number of measurement times in 1 second
unsigned long CurrentNow = 0; // Current value
unsigned long SumCurrent = 0; // Sum of Current
unsigned long MeasInterval = 1000;//1000ms=1sec

float CurrentAve = 0; // Current average for 1 sec
double IntCurrent = 0; // Integrated Current
//float Coeff = 0.107421875; // 10 bit=1024 / 1.1 Volts / 10 OHM *1000 ,Series resistance (10 OHM), unit mA
float Coeff=0.488281;  // 10 bit=1024 / 5 Volts / 10 OHM *1000 ,Series resistance (10 OHM), unit mA
void setup() {
  //analogReference(INTERNAL);
  pinMode(ResetPin, INPUT_PULLUP);  // for reset button
  Serial.begin(9600);  // Serial communication begins at a speed of 9600
  lcd.begin(16, 2); // This LCD is 16*2
  lcd.clear();  // Clear the display
  lcd.setCursor(1, 0); // Cursor at the original position
  lcd.print("Current");
  lcd.setCursor(1, 1); // Cursor at the 2nd column
  lcd.print("Integrator");
  delay(300);
  CurrentNow = 0;
  IntCurrent = 0;
  SumCurrent = 0;
  MeasN = 0;
  time2 = millis();
}

void loop() {

  MeasN = 0; //reset the measurement times
  SumCurrent = 0; //rest the sum of current

  time1 = millis(); //check time now
  time3 = time1 + MeasInterval;
  
  while (millis() < time3) { // repeat for 1000 msec=1 second
    CurrentNow = analogRead(analogPin); //Direct measurement of analog 3 pin
    SumCurrent += CurrentNow; // Sum of the current
    MeasN++;  // number of measurement times
    // delay(300);
  }

  SecNow = time1 / 1000; // time in the unit of second
  CurrentAve = Coeff * (float)SumCurrent / (float)MeasN; // average current for 1 sec

  timeForAverage = millis() - time2;
  IntCurrent +=  (double)timeForAverage * (double)CurrentAve / 1000.0; //* Integrated current
  time2 = millis();

  lcd.clear();  // LCD clear
  lcd.setCursor(0, 0); //In the 1st column, original position
  lcd.print("Sum=");  //Integrated Current=
  //lcd.setCursor(4, 0); // Set the Position
  lcd.print(IntCurrent); // Display Integrated Current  unit mA*sec
  //lcd.print(analogRead(analogPin));
  lcd.setCursor(0, 1); // In the 2nd column
  lcd.print("I=");  // Current=
  //lcd.setCursor(2, 1); // Set the Cursor position to (2,1)
  lcd.print(CurrentAve); // Display averaged current
  lcd.print("mA ");
  //lcd.setCursor(9,1);  //Set the Cursor position to (7,1)
  lcd.print(SecNow); // Display averaged current
  //lcd.setCursor(15,1);  // In the 2nd column
  lcd.print("s"); // Unit of second

  // Output to PC throgh USB/serial
  Serial.print("MeasN/SumCurrent/CurrentAve/IntegratedCurrent");
  Serial.print(MeasN); Serial.print("/");
  Serial.print(SumCurrent); Serial.print("/");
  Serial.print(CurrentAve); Serial.print("/");
  Serial.println(IntCurrent);

  if (digitalRead(ResetPin) == LOW) {
    IntCurrent = 0; // reset the Integrated Current when the button pushed
  }
}