#!/usr/bin/env python3

from time import sleep
import threading
try:
    import RPi.GPIO as GPIO
except RuntimeError:
    print("Error importing RPi.GPIO! Run this script as root.")
    exit(1)

class LED(Thread):

    def __init__(self, pin, frequency, use_pwm=False):
        Thread.__init__(self)
        self.__pin = pin
        self.__frequency
        self.__use_pwm = use_pwm
        self.__pwm = None

        GPIO.setup(pin, GPIO.OUT)
        if use_pwm:
            self.__pwm = GPIO.PWM(pin, frequency)
        
    def new_random_frequency(self):
        self.__frequency = random.randint(1, 100)
        
    def run(self):
        try:
            if self.__use_pwm:
                self.__pwm.start(0)
                while True:
                    for s in range(0, 1, 0.1):
                        self.__pwm.ChangeDutyCycle(math.sin(s * math.pi))
                        #sleep(1 / self.__frequency)
                        sleep(1)
            else:
                while True:
                    GPIO.output(LED_GREEn, GPIO.LOW)
                    sleep(1 / self.__frequency)
                    GPIO.output(LED_GREEn, GPIO.HIGH)
                    sleep(1 / self.__frequency)
        except KeyboardInterrupt:
            GPIO.cleanup()
def setup():
    # Run GPIO with PI pin numbers.
    GPIO.setmode(GPIO.BCM)

def main():
    setup()
    
    # Pin, frequency in Hz
    led_thread = LED(17, 1000)
    led_thread.run()



if __name__ == "__main__":
    main()