from frappy.core import Readable, Parameter, FloatRange, HasIO, StringIO, Property, IntRange,\
    IDLE, BUSY, WARN, ERROR, Drivable, BoolType, Attached, Writable


class Temp(Writable):
    """a voltage output with loop"""

    target = Parameter('target voltage', FloatRange(0, 325, unit='K'),
                            readonly=False)

    def write_target(self, target):
        self.value = target