Geiger_counter.pde

/*
*  ------Geiger Tube board (Arduino Code) Example--------
 *
 *  Explanation: This example shows how to get the signal from the Geiger Tube
 *  in Arduino, we use one of the Arduino interrupt pins (PIN2).
 *  We count the time (ms) between two pulses of the Geiger tube.
 *
 *  Copyright (C) 2011 Libelium Comunicaciones Distribuidas S.L.
 *  http://www.libelium.com
 *
 *  This program is free software: you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation, either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 *  Version:      0.3
 *  Design:      Marcos Yarza, David Gascon
 *  Implementation:   Marcos Yarza
 */

/*
 updated version by Joey Stanford
 community code from Stfb included
 */

// include the library code:
#include <LiquidCrystal.h>

// initialize the library with the numbers of the interface pins
LiquidCrystal lcd(3,4,5,6,7,8);


// Threshold values for the led bar
#define TH1 45
#define TH2 95
#define TH3 200
#define TH4 400
#define TH5 600


// Conversion factor - CPM to uSV/h
#define CONV_FACTOR 0.00812

// Natural average radiation in uSV/h
#define NATURAL_RADIATION 0.27

// Variables
int ledArray [] = {
  10,11,12,13,9};
int geiger_input = 2;
long count = 0;
long countPerMinute = 0;
long timePrevious = 0;
long timePreviousMeassure = 0;
long time = 0;
long countPrevious = 0;
float radiationValue = 0.0;

// count one measure at least
int minCount = 0;
// Average radiation measure
float avg = 0;
// Natural radiation factor
int natFactor = 0;

void setup(){
  pinMode(geiger_input, INPUT);
  digitalWrite(geiger_input,HIGH);
  for (int i=0;i<5;i++){
    pinMode(ledArray[i],OUTPUT);
  }

  Serial.begin(19200);

  //set up the LCD\'s number of columns and rows:
  lcd.begin(16, 2);
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("Radiation Sensor");
  lcd.setCursor(0,1);
  lcd.print("Board - Arduino"); 
  delay(1000);

  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("Joey Stanford");
  lcd.setCursor(0,1);  
  lcd.print("joey@stan4d.net");  
  delay(1000);

  lcd.clear(); 
  lcd.setCursor(0, 0);
  lcd.print("Starting Up...");

  attachInterrupt(0,countPulse,FALLING);

}

void loop(){

  if (millis()-timePreviousMeassure > 10000){
    countPerMinute = 6*count;
    radiationValue = countPerMinute * CONV_FACTOR;
    timePreviousMeassure = millis();
    // Serial.print("☢ ");

    Serial.print(countPerMinute,DEC);
    Serial.print(",");
    Serial.print(radiationValue,4); 
    Serial.print(",");
    lcd.clear();   
    lcd.setCursor(0, 0);
    lcd.print("CPM=");
    lcd.setCursor(4,0);
    lcd.print(countPerMinute);
    lcd.setCursor(0,1);
    lcd.print(radiationValue,4);
    lcd.setCursor(6,1);
    lcd.print(" uSv");

    //led var setting 
    if(countPerMinute <= TH1) ledVar(0);
    if((countPerMinute <= TH2)&&(countPerMinute>TH1)) ledVar(1);
    if((countPerMinute <= TH3)&&(countPerMinute>TH2)) ledVar(2);
    if((countPerMinute <= TH4)&&(countPerMinute>TH3)) ledVar(3);
    if((countPerMinute <= TH5)&&(countPerMinute>TH4)) ledVar(4);
    if(countPerMinute>TH5) ledVar(5);

    count = 0;
    minCount++;
  }

  if(minCount==1){
    avg = (avg + radiationValue)/2;
    Serial.print(avg,4);
    Serial.print(",");
    lcd.setCursor(10, 0);
    lcd.print(avg,4);
    minCount = 0;
    lcd.setCursor(11, 1);
    lcd.print("X");
    natFactor = avg / NATURAL_RADIATION;
    Serial.println(natFactor, DEC);
    lcd.print(natFactor,DEC);

  }

}

void countPulse(){
  detachInterrupt(0);
  count++;
  while(digitalRead(2)==0){
  }
  attachInterrupt(0,countPulse,FALLING);
}

void ledVar(int value){
  if (value > 0){
    for(int i=0;i<=value;i++){
      digitalWrite(ledArray[i],HIGH);
    }
    for(int i=5;i>value;i--){
      digitalWrite(ledArray[i],LOW);
    }
  }
  else {
    for(int i=5;i>=0;i--){
      digitalWrite(ledArray[i],LOW);
    }
  }
}