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

#define LDR_PIN 7
#define LED_PIN 12
#define MAX 100000
#define PWM_MAX 100

int rc_time(char pin);

int main(void) {
	printf("OI");
	if(wiringPiSetupPhys() == -1) {
		printf("setup wiringPI failed!");
		return 1;
	}
	else printf("OK");

	if(softPwmCreate(LED_PIN, 0, PWM_MAX) != 0) {
		printf("erro pwm");
		return 2;
	}
	
	for(;;) {
		int t = rc_time(LDR_PIN);
		printf("%d\n", (int)t*100/MAX);
		softPwmWrite(LED_PIN,(int)t*100/MAX);
	}
	
}

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;

}