120 lines
3.8 KiB
C++
120 lines
3.8 KiB
C++
/*
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* Geiger counter Kit could get on: https://www.aliexpress.com search: geiger counter kit
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* --------------------------------------------------------------------------------------
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* WHAT IS CPM?
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* CPM (or counts per minute) is events quantity from Geiger Tube you get during one minute. Usually it used to
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* calculate a radiation level. Different GM Tubes has different quantity of CPM for background. Some tubes can produce
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* about 10-50 CPM for normal background, other GM Tube models produce 50-100 CPM or 0-5 CPM for same radiation level.
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* Please refer your GM Tube datasheet for more information. Just for reference here, J305 and SBM-20 can generate
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* about 10-50 CPM for normal background.
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* --------------------------------------------------------------------------------------
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* HOW TO CONNECT GEIGER KIT?
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* The kit 3 wires that should be connected to Arduino UNO board: 5V, GND and INT. PullUp resistor is included on
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* kit PCB. Connect INT wire to Digital Pin#2 (INT0), 5V to 5V, GND to GND. Then connect the Arduino with
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* USB cable to the computer and upload this sketch.
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*
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* Author:JiangJie Zhang * If you have any questions, please connect cajoetech@qq.com
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* Author:Dejvino
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*
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* License: MIT License
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*
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* Please use freely with attribution. Thank you!
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*/
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// include the Servo library
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#include <Servo.h>
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Servo myServo; // create a servo object
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int const PIN_SERVO = 9;
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int angle; // variable to hold the angle for the servo motor
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int const PIN_TUBE 2;
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int const PIN_FRESH = LED_BUILTIN;
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int freshState = 0;
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#include <SPI.h>
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//#define LOG_PERIOD 15000 //Logging period in milliseconds, recommended value 15000-60000.
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#define LOG_PERIOD 30000
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#define MAX_PERIOD 60000 //Maximum logging period without modifying this sketch
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unsigned long counts; //variable for GM Tube events
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unsigned long cpm; //variable for CPM
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unsigned int multiplier; //variable for calculation CPM in this sketch
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unsigned long previousMillis; //variable for time measurement
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int const subDiv = 60;
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int const subTimespan = LOG_PERIOD / subDiv;
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int subCounts = 0;
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int subTime = 0;
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void tube_impulse(){ //subprocedure for capturing events from Geiger Kit
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counts++;
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}
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void setup(){ //setup subprocedure
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myServo.attach(PIN_SERVO); // attaches the servo on pin 9 to the servo object
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myServo.write(angle);
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counts = 0;
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cpm = 0;
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multiplier = MAX_PERIOD / LOG_PERIOD; //calculating multiplier, depend on your log period
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Serial.begin(9600);
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attachInterrupt(0, tube_impulse, FALLING); //define external interrupts
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pinMode(PIN_FRESH, OUTPUT);
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digitalWrite(PIN_FRESH, LOW);
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delay(500);
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myServo.write(0);
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delay(1000);
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myServo.write(200);
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delay(1000);
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myServo.write(100);
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delay(1000);
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myServo.write(0);
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}
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void loop(){ //main cycle
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unsigned long currentMillis = millis();
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unsigned long timeDiff = currentMillis - previousMillis;
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if (freshState == 1 && timeDiff > LOG_PERIOD / 4) {
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freshState = 0;
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digitalWrite(PIN_FRESH, LOW);
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}
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if(timeDiff > LOG_PERIOD){
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previousMillis = currentMillis;
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cpm = counts * multiplier;
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angle = cpm;
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//myServo.write(angle);
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Serial.print("CPM: ");
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Serial.println(cpm);
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counts = 0;
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digitalWrite(PIN_FRESH, HIGH);
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freshState = 1;
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subCounts = 0;
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subTime = currentMillis;
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}
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int subDiff = currentMillis - subTime;
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if (subDiff >= subTimespan) {
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subTime = currentMillis;
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int subTimeSteps = timeDiff / subTimespan;
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subCounts = counts;
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int change = (counts * multiplier) - (cpm * subTimeSteps / subDiv);
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angle = cpm + change;
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if (angle < 0) { angle = 0; }
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if (angle > 200) { angle = 200; }
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myServo.write(angle);
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Serial.print("R: ");
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Serial.print(angle);
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Serial.println();
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}
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}
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