color_led.py 文件源码

def setup(self):
        """ setup GPIO pins and start GPIO PWM.        """
        from RPi import GPIO
        GPIO.setup(self.pin_red, GPIO.OUT)
        GPIO.setup(self.pin_green, GPIO.OUT)
        GPIO.setup(self.pin_blue, GPIO.OUT)

        freq = 100  # Hz
        self.red = GPIO.PWM(self.pin_red, freq)
        self.green = GPIO.PWM(self.pin_green, freq)
        self.blue = GPIO.PWM(self.pin_blue, freq)

        # Initial duty cycle is 100, that means 'off'
        self.green.start(100)
        self.red.start(100)
        self.blue.start(100)