l_samenv
21dae2d9ce
waiting 0.5 sec before the first communication helps to start properly + added usb dev names for box
204 lines
8.1 KiB
Python
204 lines
8.1 KiB
Python
# *****************************************************************************
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# This program is free software; you can redistribute it and/or modify it under
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# the terms of the GNU General Public License as published by the Free Software
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# Foundation; either version 2 of the License, or (at your option) any later
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# version.
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#
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# This program is distributed in the hope that it will be useful, but WITHOUT
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# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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# FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
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# details.
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#
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# You should have received a copy of the GNU General Public License along with
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# this program; if not, write to the Free Software Foundation, Inc.,
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# 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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#
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# Module authors:
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# Paul M. Neves <pmneves@mit.edu>
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# *****************************************************************************
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import time
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from frappy.core import Readable, Parameter, FloatRange, HasIO, StringIO, Property, IntRange,\
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IDLE, BUSY, WARN, ERROR, Drivable, BoolType, Attached, StructOf
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class ACM1219IO(StringIO):
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"""communication with ACM1219"""
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end_of_line = ('\r\n', '\r') # ('\n', '\r') ('\r\n', '\r')
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encoding = 'latin-1' # initial reply might not be ascii for a strange reason
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identification = [('*IDN?', r'.*,ACM1219,.*')]
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def checkHWIdent(self):
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for _ in range(3):
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time.sleep(0.5)
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try:
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self.communicate('*IDN?')
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break
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except Exception:
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pass
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super().checkHWIdent()
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class BothChannels(HasIO, Readable):
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"""read both capacitance channels in multiplex mode"""
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# define the communication class for automatic creation of the IO module
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ioClass = ACM1219IO
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# modifying a property of inherited parameters (unit is propagated to the FloatRange datatype)
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value = Parameter('Capacitance 1 and 2, and VT',
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StructOf(C1=FloatRange(0, 21.096, unit='pF'), C2=FloatRange(0, 21.096, unit='pF'), VT=FloatRange(-1, 1000, unit='')),
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readonly=True)
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channels_enabled = Parameter('channels on or off', BoolType(), readonly=False)
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_ch_enabled = False
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def read_value(self):
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# using the inherited HasIO.communicate method to send a command and get the reply
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natempt = 0
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maxAttempts = 5
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while natempt < maxAttempts:
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try:
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reply = self.communicate(f'readMUC')
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# print(reply)
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reply = reply.split(',')
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C1 = float(reply[0])
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C2 = float(reply[1])
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VT = float(reply[2])
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return {'C1': C1, 'C2': C2, 'VT': VT}
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except:
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''
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natempt+=1
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if natempt >= maxAttempts:
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print('Max attempt reached for reading arduino.')
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return self.value
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def read_status(self):
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# code = self.communicate(f'readStatus') # returns tons of data
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return IDLE, ''
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def read_channels_enabled(self):
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return self._ch_enabled
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def write_channels_enabled(self, channels_enabled):
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if channels_enabled:
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self.communicate(f'setCIN 1,0,00.0,00.0,0,00.0,00.0')
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self.communicate(f'setCIN 2,0,00.0,00.0,0,00.0,00.0')
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self._ch_enabled = True
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else:
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self.communicate(f'setCIN 0,0,00.0,00.0,0,00.0,00.0')
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self._ch_enabled = False
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return self.read_channels_enabled()
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class Displacement(Readable):
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# attached classes for capacitance and temperature
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cap = Attached()
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temp = Attached()
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# internal property to configure the channel
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channel = Property('the voltage channel for displacement capacitor', datatype=IntRange(1,2))
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# modifying a property of inherited parameters (unit is propagated to the FloatRange datatype)
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value = Parameter('displacement', FloatRange(None, None, unit='um'), readonly=True)
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alpha290K = Parameter('capacitor constant at 290 K', FloatRange(None, None, unit='um pF'), readonly=False)
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d0 = Parameter('offset displacement', FloatRange(None, None, unit='um'), readonly=False)
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Cp = Parameter('parallel capacitance', FloatRange(None, None, unit='pF'), readonly=False)
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d0_curve = Parameter('calibration curve for offset displacement',
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StructOf(a=FloatRange(None, None, unit='um'),
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b=FloatRange(None, None, unit='um/K'),
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c=FloatRange(None, None, unit='um/K^2'),
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d=FloatRange(None, None, unit='um/K^3'),
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e=FloatRange(None, None, unit='um/K^4'),),
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readonly=False)
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def read_value(self):
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# get temperature and capacitance
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temp = self.temp.target
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cap = self.cap.value[f'C{self.channel}']
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# calculate displacement from temperature and capacitance
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d0_T = self.d0_curve['a'] + self.d0_curve['b']*temp + self.d0_curve['c']*temp**2 + self.d0_curve['d']*temp**3 + self.d0_curve['e']*temp**4
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disp = self.alpha290K / (cap - self.Cp) - self.d0 - d0_T
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return disp
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class Force(Readable):
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# attached classes for capacitance and temperature
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cap = Attached()
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temp = Attached()
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# internal property to configure the channel
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channel = Property('the voltage channel for force capacitor', datatype=IntRange(1,2))
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# modifying a property of inherited parameters (unit is propagated to the FloatRange datatype)
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value = Parameter('force', FloatRange(None, None, unit='N'), readonly=True)
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alpha290K = Parameter('capacitor constant at 290 K', FloatRange(None, None, unit='N pF'), readonly=False)
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f0 = Parameter('offset force', FloatRange(None, None, unit='N'), readonly=False)
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Cp = Parameter('parallel capacitance', FloatRange(None, None, unit='pF'), readonly=False)
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f0_curve = Parameter('calibration curve for offset force',
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StructOf(a=FloatRange(None, None, unit='N'),
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b=FloatRange(None, None, unit='N/K'),
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c=FloatRange(None, None, unit='N/K^2'),
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d=FloatRange(None, None, unit='N/K^3'),
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e=FloatRange(None, None, unit='N/K^4'),),
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readonly=False)
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def read_value(self):
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# get temperature and capacitance
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temp = self.temp.target
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cap = self.cap.value[f'C{self.channel}']
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# calculate force from temperature and capacitance
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alpha = self.alpha290K * (0.91 + 5e-5*temp + 9e-7*temp**2)
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f0_T = self.f0_curve['a'] + self.f0_curve['b']*temp + self.f0_curve['c']*temp**2 + self.f0_curve['d']*temp**3 + self.f0_curve['e']*temp**4
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force = alpha / (cap - self.Cp) - self.f0 - f0_T
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return force
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class Stress(Readable):
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# attached classes for displacement
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force = Attached()
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# modifying a property of inherited parameters (unit is propagated to the FloatRange datatype)
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value = Parameter('stress', FloatRange(None, None, unit='GPa'), readonly=True)
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area = Parameter('cross sectional area of sample in mm^2', FloatRange(None, None, unit='mm^2'), readonly=False)
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def read_value(self):
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return self.force.value / self.area / 1000
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class Strain(Readable):
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# attached classes for displacement
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displacement = Attached()
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# modifying a property of inherited parameters (unit is propagated to the FloatRange datatype)
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value = Parameter('strain', FloatRange(None, None, unit='m/m'), readonly=True)
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L = Parameter('length of sample in mm', FloatRange(None, None, unit='mm'), readonly=False)
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def read_value(self):
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return self.displacement.value / (1000*self.L)
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class YoungsModulus(Readable):
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# attached classes for displacement
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stress = Attached()
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strain = Attached()
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# modifying a property of inherited parameters (unit is propagated to the FloatRange datatype)
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value = Parameter('Young\'s modulus', FloatRange(None, None, unit='GPa'), readonly=True)
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def read_value(self):
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return self.stress.value / self.strain.value
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