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#include <SPI.h>

#define LOG_PERIOD 15000  //Logging period in milliseconds, recommended value 15000-60000.
#define MAX_PERIOD 60000  //Maximum logging period without modifying this sketch

unsigned long counts;     //variable for GM Tube events
float cpm;        //variable for CPM
unsigned long multiplier;  //variable for calculation CPM in this sketch
unsigned long previousMillis;  //variable for time measurement
float MSVh;
float MR;
//float conversionFactor = 0.0057; //SBM-20
float conversionFactor = 0.008120; // J305ß

void tube_impulse(){       //subprocedure for capturing events from Geiger Kit
  counts++;
}
void setup()   
              {
  Serial.begin(9600);


        counts = 0;
        cpm = 0;
        multiplier = MAX_PERIOD / LOG_PERIOD;      //calculating multiplier, depend on your log period
        Serial.begin(9600);
        attachInterrupt(0, tube_impulse, FALLING); //define external interrupts 
               }


void loop() {
 unsigned long currentMillis = millis();
  if(currentMillis - previousMillis > LOG_PERIOD){
    previousMillis = currentMillis;
    cpm = counts * multiplier;
    MSVh = cpm*conversionFactor;
    
    Serial.print(cpm);
    Serial.println(" CPM");
    Serial.print(MSVh);
    Serial.println (" mSVh");
    
    counts = 0;
  }
}