Updated the ACM1219 driver

cfg/razorbillUC220T_cfg.py

@@ -33,7 +33,7 @@ Mod('V2',
 Mod('io2',
     'frappy_psi.ACM1219.ACM1219IO',
     'communication',
-    uri='serial:///dev/tty.usbserial-A700fmAI?baudrate=9600+bytesize=8+parity=none+stopbits=1')
+    uri='serial:///dev/tty.usbserial-A904TGR7?baudrate=9600+bytesize=8+parity=none+stopbits=1')
 Mod('C1C2',
     'frappy_psi.ACM1219.BothChannels',
     'Capacitance channels 1 and 2',
@@ -58,6 +58,24 @@ Mod('F',
     Cp=0.0755,
     f0_curve={'a':38.9,'b':-0.0147,'c':-0.000346,'d':8.96e-7,'e':-1.58e-9},
     temp='T')
+Mod('stress',
+    'frappy_psi.ACM1219.Stress',
+    'Sample stress from force',
+    force='F',
+    area=0.1,
+    )
+Mod('strain',
+    'frappy_psi.ACM1219.Strain',
+    'Sample strain from force',
+    displacement='d',
+    L=3,
+    )
+Mod('YM',
+    'frappy_psi.ACM1219.YoungsModulus',
+    'Sample youngs modulus from stress and strain',
+    stress='stress',
+    strain='strain',
+    )
 
 Mod('T',
     'frappy_psi.dummy.Temp',

frappy_psi/ACM1219.py

@@ -23,7 +23,7 @@ from frappy.core import Readable, Parameter, FloatRange, HasIO, StringIO, Proper
 
 class ACM1219IO(StringIO):
     """communication with ACM1219"""
-    end_of_line = '\n'
+    end_of_line = ('\r\n', '\r') # ('\n', '\r') ('\r\n', '\r')
     wait_before = 0.05
     identification = [('*IDN?', r'.*')]
 
@@ -150,6 +150,43 @@ class Force(Readable):
         force = alpha / (cap - self.Cp) - self.f0 - f0_T
 
         return force
+    
+
+class Stress(Readable):
+
+    # attached classes for displacement
+    force = Attached()
+
+    # modifying a property of inherited parameters (unit is propagated to the FloatRange datatype)
+    value = Parameter('stress', FloatRange(None, None, unit='GPa'), readonly=True)
+    area = Parameter('cross sectional area of sample in mm^2', FloatRange(None, None, unit='mm^2'), readonly=False)
+
+    def read_value(self):
+        return self.force.value / self.area / 1000
 
 
+class Strain(Readable):
+
+    # attached classes for displacement
+    displacement = Attached()
+
+    # modifying a property of inherited parameters (unit is propagated to the FloatRange datatype)
+    value = Parameter('strain', FloatRange(None, None, unit='m/m'), readonly=True)
+    L = Parameter('length of sample in mm', FloatRange(None, None, unit='mm'), readonly=False)
+
+    def read_value(self):
+        return self.displacement.value / (1000*self.L)
+    
+
+class YoungsModulus(Readable):
+
+    # attached classes for displacement
+    stress = Attached()
+    strain = Attached()
+
+    # modifying a property of inherited parameters (unit is propagated to the FloatRange datatype)
+    value = Parameter('Young\'s modulus', FloatRange(None, None, unit='GPa'), readonly=True)
+
+    def read_value(self):
+        return self.stress.value / self.strain.value
     

frappy_psi/dummy.py

@@ -28,4 +28,7 @@ class Temp(Writable):
                             readonly=False)
 
     def write_target(self, target):
-        self.value = target
+        self.value = target
+
+    def read_value(self):
+        return 0