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geigerRealSimulator.ino
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geigerRealSimulator.ino
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#define _DEBUG
#define CLIK 8
#define ECHO 2
#define TRIG 3
#define TAU 2.2414 // the decay time in minutes
#define c 340.e-6 // the speed of sound
float tau = TAU*60.;
unsigned long t0;
void setup() {
pinMode(CLIK, OUTPUT);
pinMode(ECHO, INPUT);
pinMode(TRIG, OUTPUT);
digitalWrite(TRIG, LOW);
digitalWrite(CLIK, LOW);
t0 = millis();
#ifdef _DEBUG
Serial.begin(9600);
Serial.print("============ tau = ");
Serial.print(tau);
Serial.println(" s");
#endif
}
void trigger() {
/* trigger the sensor */
digitalWrite(TRIG, HIGH);
delayMicroseconds(10);
digitalWrite(TRIG, LOW);
}
float measure() {
/* measure the distance between the sensor and the obstacle */
float d = 0.;
for (int i = 0; i < 15; i++) {
trigger();
unsigned long T = pulseIn(ECHO, HIGH);
d += c*T/2.;
}
return d;
}
int status = HIGH; // the current status of the relay
void loop() {
/* measure distance and time */
float d = measure();
float t = (millis() - t0)*1.e-3;
/* compute the probability of a decay */
float Pdecay = exp(-t/tau);
float f = (float)random(1000)/1000.;
/* if an atom decay... */
if (f < Pdecay) {
/* ...detect it with a probability that depens on d */
unsigned long trigger = 10000./(d*d);
unsigned long r = random(10000);
if (r < trigger) {
digitalWrite(CLIK, status);
#ifdef _DEBUG
Serial.println(t);
#endif
if (status == HIGH) {
status = LOW;
} else {
status = HIGH;
}
}
}
}