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pendulumVelocity.py
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pendulumVelocity.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 = 5
RPWIDTH = 300
RPGAP = 4
running = False
VMIN = -5
VMAX = 5
TMIN = 0
TMAX = 5
data = [ [], [] ]
currentTrace = None
traces = []
history = [] # Data store
sources = ['A1','A2','A3', 'MIC']
trial = 0
def __init__(self, device=None):
QWidget.__init__(self)
self.p = device # connection to the device hardware
try:
self.p.select_range('A1',4.0)
self.p.configure_trigger(0, 'A1', 0)
except:
pass
self.traceCols = utils.makeTraceColors()
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 (V)'))
self.pwin.disableAutoRange()
self.pwin.setXRange(self.TMIN, self.TMAX)
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()
l = QLabel(text=self.tr('Duration'))
l.setMaximumWidth(80)
H.addWidget(l)
self.TMAXtext = utils.lineEdit(40, self.TMAX, 6, None)
H.addWidget(self.TMAXtext)
l = QLabel(text=self.tr('Seconds'))
l.setMaximumWidth(60)
H.addWidget(l)
right.addLayout(H)
b = QPushButton(self.tr("Start"))
right.addWidget(b)
b.clicked.connect(self.start)
b = QPushButton(self.tr("Stop"))
right.addWidget(b)
b.clicked.connect(self.stop)
b = QPushButton(self.tr("Analyze last Trace"))
right.addWidget(b)
b.clicked.connect(self.fit_curve)
b = QPushButton(self.tr("Clear Traces"))
right.addWidget(b)
b.clicked.connect(self.clear)
self.SaveButton = QPushButton(self.tr("Save Data"))
self.SaveButton.clicked.connect(self.save_data)
right.addWidget(self.SaveButton)
l = QLabel(text=self.tr('\nSet SQ1 Frequency\nFor Driven Pendulum Expt.'))
right.addWidget(l)
self.SQ1slider = utils.slider(10, 1000, 100, 1000,self.sq1_slider)
right.addWidget(self.SQ1slider)
self.Freq = QLabel('')
right.addWidget(self.Freq)
#------------------------end of right panel ----------------
top = QHBoxLayout()
top.addWidget(self.pwin)
top.addLayout(right)
full = QVBoxLayout()
full.addLayout(top)
self.msgwin = QLabel(text='')
full.addWidget(self.msgwin)
self.setLayout(full)
self.timer = QTimer()
self.timer.timeout.connect(self.update)
self.timer.start(self.TIMER)
#----------------------------- end of init ---------------
def sq1_slider(self, val):
try:
res = self.p.set_sqr1(val*0.01)
ss = '%5.2f'%res
self.msg(self.tr('sqr1 set to ') + ss + self.tr(' Hz'))
self.Freq.setText(ss)
except:
self.comerr()
def fit_curve(self):
if self.running == True or self.data[0]==[]:
return
if (len(self.data[0])%2) == 1: # make it an even size, for fitting
self.data[0] = self.data[0][:-1]
self.data[1] = self.data[1][:-1]
fa = em.fit_dsine(self.data[0], self.data[1], 1000.0) # fit in em expects khz
if fa != None:
pa = fa[1]
self.traces.append(self.pwin.plot(self.data[0], fa[0], pen = self.traceCols[self.trial%5]))
self.trial += 1
ss1 = '%5.2f'%pa[1]
ss2 = '%5.3f'%pa[4]
self.msg(self.tr('Frequency of Oscillation = ') + ss1 + self.tr(' Hz. Damping Factor = ') + ss2)
self.history.append((self.data[0], fa[0]))
else:
self.msg(self.tr('Analysis failed. Could not fit data'))
def update(self):
if self.running == False:
return
try:
t,v = self.p.get_voltage_time('A3') # Read A3
except:
self.comerr()
return
if len(self.data[0]) == 0:
self.start_time = t
elapsed = 0
else:
elapsed = t - self.start_time
self.data[0].append(elapsed)
self.data[1].append(v)
if elapsed > self.TMAX:
self.running = False
self.history.append(self.data)
self.traces.append(self.currentTrace)
self.msg(self.tr('Time Vs Angular velocity plot completed'))
return
if self.index > 1: # Draw the line
self.currentTrace.setData(self.data[0], self.data[1])
self.index += 1
def start(self):
if self.running == True: return
try:
val = float(self.TMAXtext.text())
except:
self.msg(self.tr('Invalid Duration'))
return
self.TMAX = val
self.pwin.setXRange(self.TMIN, self.TMAX)
self.pwin.setYRange(self.VMIN, self.VMAX)
self.running = True
self.data = [ [], [] ]
self.currentTrace = self.pwin.plot([0,0],[0,0], pen = self.traceCols[self.trial%5])
self.index = 0
self.trial += 1
self.msg(self.tr('Started Measurements'))
def stop(self):
if self.running == False: return
self.running = False
self.history.append(self.data)
self.traces.append(self.currentTrace)
self.msg(self.tr('User Stopped'))
def clear(self):
for k in self.traces:
self.pwin.removeItem(k)
self.history = []
self.trial = 0
self.msg(self.tr('Cleared Traces and Data'))
def save_data(self):
if self.history == []:
self.msg(self.tr('No data to save'))
return
fn = QFileDialog.getSaveFileName()
if fn != '':
self.p.save(self.history, fn)
self.msg(self.tr('Traces saved to ') + unicode(fn))
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_())