try:
    import gpio
except ImportError:
    raise ImportError("gpio not found.")

class Heat(object):
    def __init__(self, pin):
        self.pin = gpio.Gpio(pin)

        self.pin.export()
        self.pin.direction(gpio.Gpio.DIRECTION_OUT)

        self.pin.write(0)

    def on(self):
        self.pin.write(1)

    def off(self):
        self.pin.write(0)