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rodPendulum.py
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rodPendulum.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
NMIN = 0
NMAX = 10
TMIN = 0
TMAX = 2000 # milliseconds
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
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('Trials'))
ax = self.pwin.getAxis('left')
ax.setLabel(self.tr('Time Period (mSec)'))
self.pwin.disableAutoRange()
self.pwin.setXRange(self.NMIN, self.NMAX)
self.pwin.setYRange(self.TMIN, self.TMAX)
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)
'''
b = QPushButton(self.tr("Analyze last Trace"))
right.addWidget(b)
b.clicked.connect(self.fit_curve)
'''
H = QHBoxLayout()
l = QLabel(text=self.tr('Pendulum length'))
l.setMaximumWidth(110)
H.addWidget(l)
self.PLENtext = utils.lineEdit(40, self.NMAX, 6, None)
H.addWidget(self.PLENtext)
l = QLabel(text=self.tr('cm'))
l.setMaximumWidth(20)
H.addWidget(l)
right.addLayout(H)
b = QPushButton(self.tr("Clear Data and 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)
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)
H = QHBoxLayout()
l = QLabel(text=self.tr('Number of trials'))
l.setMaximumWidth(110)
H.addWidget(l)
self.NMAXtext = utils.lineEdit(40, self.NMAX, 6, None)
H.addWidget(self.NMAXtext)
right.addLayout(H)
H = QHBoxLayout()
self.Results = QTextEdit()
self.Results.setMaximumWidth(self.RPWIDTH/2-5)
H.addWidget(self.Results)
self.gResults = QTextEdit()
self.gResults.setMaximumWidth(self.RPWIDTH/2-5)
H.addWidget(self.gResults)
right.addLayout(H)
#------------------------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 fit_curve(self):
if self.running == True or self.data[0]==[]:
return
return
# Make histogram to be added
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])
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)
else:
self.msg(self.tr('Analysis failed. Could not fit data'))
def update(self):
if self.running == False:
return
if self.p == None:
self.comerr()
return
try:
T = self.p.multi_r2rtime('SEN', 2)
except:
self.comerr()
if T < 0:
s = self.tr('Timeout')
gs = '--'
else:
s ='%f'%T
gs = '%5.0f'%(8*math.pi**2*self.PLEN/3/T**2)
self.Results.append(self.tr(s))
self.gResults.append(self.tr(gs))
T *= 1000 #seconds to milliseconds
self.data[0].append(self.index)
self.data[1].append(T)
if self.index >= self.NMAX:
self.running = False
self.history.append(self.data)
self.traces.append(self.currentTrace)
self.msg(self.tr('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.p == None:
self.comerr()
return
if self.running == True: return
try:
val = float(self.NMAXtext.text())
except:
self.msg(self.tr('Invalid Number of trials'))
return
self.NMAX = val
try:
val = float(self.PLENtext.text())
except:
self.msg(self.tr('Invalid Length'))
return
self.PLEN = val
try:
self.p.set_sqr1(0) # Light the LED
T = self.p.multi_r2rtime('SEN', 2) # Timeout in first call ??
except:
self.mcomerr()
self.pwin.setXRange(self.NMIN, self.NMAX)
self.pwin.setYRange(self.TMIN, self.TMAX)
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.p.set_sqr1(0)
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)
try:
self.p.set_sqr1(-1) # trurn off the LED
self.msg(self.tr('User Stopped'))
except:
self.comerr()
def clear(self):
for k in self.traces:
self.pwin.removeItem(k)
self.history = []
self.trial = 0
self.Results.setText('')
self.gResults.setText('')
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_())