#include <wiringPi.h>
#include <stdio.h>

#define LDR_PIN 7

int rc_time(char pin);

int main(void) {
	printf("LDR Pino %d\n",LDR_PIN);
	if(wiringPiSetupPhys() == -1) {
		printf("setup wiringPI failed!");
		return 1;
	}

	
	for(;;) {
		printf("%d\n", rc_time(LDR_PIN));
	}
	
}

int rc_time(char pin) {
	int count = 0;
	
	pinMode(pin, OUTPUT);
	digitalWrite(pin, LOW);
	delay(100);
	
	pinMode(pin, INPUT);
	
	while (digitalRead(pin) == LOW)
		count++;
		
	return count;

}