meerstetter.py

import mecom
import time

class Peltier(mecom.MeCom):
    def __init__(self, port, interesting_ids=[1000, 1001, 1010, 1020, 1021, 1200, 2010]):
        super().__init__(port)
        self.interested = interesting_ids

    def print(self, verbose=False):
        for command in sorted(self.PARAMETERS._PARAMETERS, key=lambda x: x.id):
            if verbose or command.id in self.interested:
                print(f'({command.id:05d}){command.name:50s}{self[command.id]}')

    @property
    def port(self):
        return self.ser.port

    @property
    def status(self):
        return super().status()

    @property
    def address(self):
        return super().identify()

    def __getitem__(self, parameter_id):
        try:
            value = super().get_parameter(parameter_id=parameter_id, address=self.address)
        except (mecom.ResponseException, mecom.WrongChecksum) as ex:
            self.stop()
            _ids = self.interested
            _parameters = self.PARAMETERS._PARAMETERS
            super().__init__(self.port)
            self.interested = _ids
            self.PARAMETERS._PARAMETERS = _parameters
        return value

    def __setitem__(self, parameter_id, value):
        try:
            super().set_parameter(parameter_id=parameter_id, value=value, address=self.address)
        except (mecom.ResponseException, mecom.WrongChecksum) as ex:
            self.stop()
            _ids = self.interested
            _parameters = self.PARAMETERS._PARAMETERS
            super().__init__(self.port)
            self.interested = _ids
            self.PARAMETERS._PARAMETERS = _parameters

    def __repr__(self):
        """Representation of the object"""
        module = type(self).__module__
        qualname = type(self).__qualname__
        return f"<{module}.{qualname}(port={self.port}, addr={self.address}, status={self.status}) at {hex(id(self))}>"

    @property
    def object_temp(self):
        return self[1000]

    @property
    def sink_temp(self):
        return self[1001]

    @property
    def target_temp(self):
        return self[1010]

    @target_temp.setter
    def target_temp(self, tempTarget):
        self[3000] = float(tempTarget)

    @property
    def current(self):
        return self[1020]

    @current.setter
    def current(self, current):
        self[2020] = float(current)

    @property
    def voltage(self):
        return self[1021]

    @voltage.setter
    def voltage(self, voltage):
        self[2021] = float(voltage)

    @property
    def stable(self):
        return self[1200]

    def add_parameter(self, config):
        self.PARAMETERS._PARAMETERS.append(mecom.Parameter(config))


with Peltier("/dev/ttyUSB0") as mc:
    mc.add_parameter({"id": 2000, "name": "Input Selection", "format": "INT32"})
    mc.add_parameter({"id": 3020, "name": "Mode", "format": "INT32"})

    # 3.3.4.2 CHx Temperature Controller PID Values
    mc.add_parameter({"id": 3010, "name": "Kp", "format": "FLOAT32"})
    mc.add_parameter({"id": 3011, "name": "Ti", "format": "FLOAT32"})
    mc.add_parameter({"id": 3012, "name": "Td", "format": "FLOAT32"})
    mc.add_parameter({"id": 3013, "name": "D Part Damping PT1", "format": "FLOAT32"})

    # 3.3.4.4 CHx Peltier Characteristics
    mc.add_parameter({"id": 3030, "name": "Maximal Current Imax", "format": "FLOAT32"})
    mc.add_parameter({"id": 3033, "name": "Delta Temperature dTmax", "format": "FLOAT32"})
    mc.add_parameter({"id": 3034, "name": "Positive Current is", "format": "INT32"})

    mc.add_parameter({"id": 51000, "name": "Auto Tuning Start", "format": "INT32"})
    mc.add_parameter({"id": 51001, "name": "Auto Tuning Cancel", "format": "INT32"})
    mc.add_parameter({"id": 51002, "name": "Thermal Model Speed", "format": "INT32"})

    mc.add_parameter({"id": 51014, "name": "Tuned Kp", "format": "FLOAT32"})
    mc.add_parameter({"id": 51015, "name": "Tuned Ti", "format": "FLOAT32"})
    mc.add_parameter({"id": 51016, "name": "Tuned Td", "format": "FLOAT32"})

    mc.add_parameter({"id": 51020, "name": "Auto Tuning Status", "format": "INT32"})
    mc.add_parameter({"id": 51021, "name": "Tuning Progress", "format": "FLOAT32"})
    mc.interested.extend([51000, 51001, 51020, 51021])
    try:
        # # which device are we talking to?
        address = mc.address
        status = mc.status

        while status != 'Ready':
            print('Status is: {status}')
            mc.reset_device()
            status = mc.status

        # set standard PID settings
        mc[3010] = 10.0
        mc[3011] = 300.0
        mc[3012] = 0.0

        # set peltier characteristics from datasheet
        # https://www.cuidevices.com/product/resource/cp85-2.pdf
        mc[3030] = 8.5
        mc[3033] = 95.0
        mc[3034] = 0

        print(mc)
        print("-"*50)
        mc.print(True)

        # set target temperature
        mc[3000] = 20.0

        # set fast thermal model speed
        mc[51002] = 0
        print("-"*50)
        mc.print(True)

        breakpoint()

        while True:
            print("-"*50)
            mc.print()
            time.sleep(3)
    except:
        mc[3000] = 25.0