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RLtransient_N.py
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RLtransient_N.py
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# -*- coding: utf-8; mode: python; indent-tabs-mode: t; tab-width:4 -*-
import sys, time, utils, math, os.path
from QtVersion import *
import pyqtgraph as pg
import numpy as np
import eyes17.eyemath17 as em
class Expt(QWidget):
TIMER = 50
RPWIDTH = 300
RPGAP = 4
AWGmin = 1
AWGmax = 5000
AWGval = 1000
tbvals = [0.05, 0.200, 0.500, 1.0, 2.0, 5.0, 10.0, 20.0, 50.0] # allowed mS/div values
NP = 500 # Number of samples
TG = 2 # Number of channels
MINDEL = 1 # minimum time between samples, in usecs
MAXDEL = 1000
delay = MINDEL # Time interval between samples
TBval = 2 # timebase list index
VMIN = -5
VMAX = 5
MAXCHAN = 1
timeData = [None]*MAXCHAN
voltData = [None]*MAXCHAN
voltDataFit = [None]*MAXCHAN
traceWidget = [None]*MAXCHAN
traceWidget = [None]*MAXCHAN
history = [] # Data store
traces = []
trial = 2
sources = ['A1','A2','A3', 'MIC']
chanpens = ['y','g','w','m'] #pqtgraph pen colors
def __init__(self, device=None):
QWidget.__init__(self)
self.p = device # connection to the device hardware
try:
self.p.select_range('A1',8.0)
except:
pass
self.history = []
self.traces = []
self.pwin = pg.PlotWidget() # pyqtgraph window
self.pwin.showGrid(x=True, y=True) # with grid
ax = self.pwin.getAxis('bottom')
ax.setLabel(self.tr('Time (mS)'))
ax = self.pwin.getAxis('left')
ax.setLabel(self.tr('Voltage'))
self.pwin.disableAutoRange()
self.pwin.setYRange(self.VMIN, self.VMAX)
#self.pwin.hideButtons() # Do not show the 'A' button of pg
right = QVBoxLayout() # right side vertical layout
right.setAlignment(Qt.AlignTop)
right.setSpacing(self.RPGAP)
H = QHBoxLayout()
self.SaveButton = QPushButton(self.tr("Save Data to"))
self.SaveButton.setMaximumWidth(90)
self.SaveButton.clicked.connect(self.save_data)
H.addWidget(self.SaveButton)
self.Filename = utils.lineEdit(150, self.tr('RCtransient.txt'),20,None )
H.addWidget(self.Filename)
right.addLayout(H)
H = QHBoxLayout()
l = QLabel(text=self.tr('Timebase'))
l.setMaximumWidth(60)
H.addWidget(l)
self.TBslider = utils.slider(0, len(self.tbvals)-1, self.TBval, 150, self.set_timebase)
H.addWidget(self.TBslider)
l = QLabel(text=self.tr('mS/div'))
l.setMaximumWidth(60)
H.addWidget(l)
right.addLayout(H)
b = QPushButton(self.tr("0 -> 5V step on OD1"))
b.clicked.connect(self.charge)
right.addWidget(b)
b = QPushButton(self.tr("5 -> 0V step on OD1"))
b.clicked.connect(self.discharge)
right.addWidget(b)
H = QHBoxLayout()
l = QLabel(text=self.tr('Rext ='))
l.setMaximumWidth(40)
H.addWidget(l)
self.Rextext = utils.lineEdit(100, 1000, 6, None)
H.addWidget(self.Rextext)
l = QLabel(text=self.tr('Ohm'))
l.setMaximumWidth(20)
H.addWidget(l)
right.addLayout(H)
b = QPushButton(self.tr("Analyse last Trace"))
b.clicked.connect(self.fit_curve)
right.addWidget(b)
b = QPushButton(self.tr("Clear Data & Traces"))
b.clicked.connect(self.clear)
right.addWidget(b)
#------------------------end of right panel ----------------
top = QHBoxLayout()
top.addWidget(self.pwin)
top.addLayout(right)
full = QVBoxLayout()
full.addLayout(top)
self.msgwin = QLabel(text=self.tr('messages'))
full.addWidget(self.msgwin)
self.setLayout(full)
self.timer = QTimer()
self.timer.timeout.connect(self.update)
self.timer.start(self.TIMER)
self.set_timebase(self.TBval)
#----------------------------- end of init ---------------
def getSP(self, ya):
if min(ya) < 0.1: #discharge
minval = 0
minIndex = 0
for k in range(len(ya)):
if ya[k] < minval:
minval = ya[k]
minIndex = k
if minIndex > 1: minIndex -= 1
if (minIndex % 2) != 0: minIndex +=1 #odd number not good
return minIndex
def fit_curve(self):
try:
Rext = float(self.Rextext.text())
except:
self.msg(self.tr('Enter a valid Resistance'))
return
if self.history != []:
sp = self.getSP(self.history[-1][1])
ta = self.history[-1][0][sp:]
va = self.history[-1][1][sp:]
fa = em.fit_exp(ta,va)
else:
self.msg(self.tr('No data to analyze.'))
return
if fa != None:
try:
self.p.set_state(OD1=1) # Do some DC work to find the resistance of the Inductor
time.sleep(.5)
v = self.p.get_voltage('A2')
Vind = self.p.get_voltage('A1') # voltage across the Inductor
except:
self.comerr()
return
if v > 4.0: # Means user has connected OD1 to A2
vtotal = v
else:
vtotal = 5.0 # Assume OD1 = 5 volts
i = (vtotal - Vind)/Rext
Rind = Vind/i
pa = fa[1]
par1 = abs(1.0 / pa[1])
ss1 = '%5.3f'%par1
ss2 = '%5.0f'%Rind
ss3 = '%5.1f'%((Rext+Rind)*par1)
self.msg(self.tr('L/R = ') + ss1 + self.tr(' mSec : Rind = ') + ss2 + self.tr(' Ohm : L = ') + ss3 + self.tr(' mH'))
self.traces.append(self.pwin.plot(ta,va, pen = self.trial*2))
else:
self.msg(self.tr('Failed to fit the curve with V=Vo*exp(-t*L/R)'))
def charge(self):
try:
self.p.set_state(OD1=0) # OD1 to LOW
time.sleep(self.tbvals[self.TBval]*0.01)
t,v = self.p.capture_action('A1',self.NP, self.TG,'SET_HIGH')
except:
self.comerr()
return
print("Charging")
self.traces.append(self.pwin.plot(t,v, pen = self.trial*2))
self.history.append((t,v))
self.trial += 1
def discharge(self):
try:
self.p.set_state(OD1=1) # OD1 to HIGH
time.sleep(self.tbvals[self.TBval]*0.01)
t,v = self.p.capture_action('A1',self.NP, self.TG,'SET_LOW')
except:
self.comerr()
return
self.traces.append(self.pwin.plot(t,v, pen = self.trial*2))
self.history.append((t,v))
self.trial += 1
def clear(self):
for k in self.traces:
self.pwin.removeItem(k)
self.history = []
self.trial = 2
def save_data(self):
fn = self.Filename.text()
self.p.save(self.history, fn)
self.msg(self.tr('Traces saved to ') + unicode(fn))
def set_timebase(self, tb):
self.TBval = tb
self.pwin.setXRange(0, self.tbvals[self.TBval]*10)
msperdiv = self.tbvals[int(tb)] #millisecs / division
totalusec = msperdiv * 1000 * 10.0 # total 10 divisions
self.TG = int(totalusec/self.NP)
if self.TG < self.MINDEL:
self.TG = self.MINDEL
elif self.TG > self.MAXDEL:
self.TG = self.MAXDEL
def msg(self, m):
self.msgwin.setText(self.tr(m))
def comerr(self):
self.msgwin.setText('<font color="red">' + self.tr('Error. Try Device->Reconnect'))
if __name__ == '__main__':
import eyes17.eyes
dev = eyes17.eyes.open()
app = QApplication(sys.argv)
# translation stuff
lang=QLocale.system().name()
t=QTranslator()
t.load("lang/"+lang, os.path.dirname(__file__))
app.installTranslator(t)
t1=QTranslator()
t1.load("qt_"+lang,
QLibraryInfo.location(QLibraryInfo.TranslationsPath))
app.installTranslator(t1)
mw = Expt(dev)
mw.show()
sys.exit(app.exec_())