/
classes.py
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/
classes.py
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# Dependencies
import os
import SolUI
import sys
import collections
import pyqtgraph as pg
import numpy as np
import time
from pyqtgraph.Qt import QtCore, QtGui, uic
from datetime import datetime
import RPi.GPIO as GPIO
from scipy.signal import lfilter, lfilter_zi, iirdesign
# Dependent Scripts
import adc
import methods
#Set Up GPIO Pins
GPIO.setmode(GPIO.BCM)
GPIO.setup(21, GPIO.IN, pull_up_down=GPIO.PUD_UP)
GPIO.setup(20, GPIO.IN, pull_up_down=GPIO.PUD_UP)
GPIO.setup(16, GPIO.IN, pull_up_down=GPIO.PUD_UP)
GPIO.setup(12, GPIO.IN, pull_up_down=GPIO.PUD_UP)
GPIO.setup(26, GPIO.IN, pull_up_down=GPIO.PUD_UP)
GPIO.setup(19, GPIO.IN, pull_up_down=GPIO.PUD_UP)
GPIO.setup(13, GPIO.IN, pull_up_down=GPIO.PUD_UP)
GPIO.setup(6, GPIO.IN, pull_up_down=GPIO.PUD_UP)
#########################
## EKG UI ##
#########################
class ekgui(QtGui.QMainWindow):
def __init__(self, sampleinterval=0.02, timewindow=10):
# Data Prep
self.period = sampleinterval #sample period in seconds
self.samplerate = 1/self.period
self._bufsize = int(timewindow/sampleinterval)
self.buffer = collections.deque([0.0]*self._bufsize, self._bufsize) #buffer for displayed data
self.buffer2 = collections.deque([0.0]*self._bufsize, self._bufsize)
self.buffer3 = collections.deque([0.0]*self._bufsize, self._bufsize)
self.buffer4 = collections.deque([0.0]*self._bufsize, self._bufsize)
self.x = np.linspace(-timewindow, 0.0, self._bufsize)
self.y = np.zeros(self._bufsize, dtype=np.float)
self.y2 = np.zeros(self._bufsize, dtype=np.float)
self.y3 = np.zeros(self._bufsize, dtype=np.float)
self.y4 = np.zeros(self._bufsize, dtype=np.float)
self.session = session() #assign default session
self.running = False;
# Init UI
self.app = QtGui.QApplication(sys.argv)
QtGui.QMainWindow.__init__(self)
self.ui = uic.loadUi(os.path.dirname(os.path.abspath(__file__)) + '/ekgui/ekg.ui', self)
self.setWindowFlags(QtCore.Qt.FramelessWindowHint)
# Init Graph Element
self.plot = self.ui.graph.getPlotItem()
self.view = self.plot.getViewBox()
self.view.setRange(None, (-9,-1), (0.2,adc.voltage()-0.2), None, True, True)
self.ui.graph.showGrid(x=True, y=True)
self.ui.graph.setLabel('left', 'amplitude', 'V')
self.ui.graph.setLabel('bottom', 'time', 's')
self.curve = self.graph.plot(self.x, self.y, pen=(255,0,0))
self.curve2 = self.graph.plot(self.x, self.y2, pen=(11,229,245))
self.curve3 = self.graph.plot(self.x, self.y3, pen=(26,230,39))
# Filter Setup
hpass = .05 #highpass frquency in Hz
lpass = 120 #lowpass frequency in Hz
bp_bw = .02 #bandpass attenuation bandwidth in Hz
notch = 50 #notch frquency in Hz
notch_bw = 10 #notch bandwidth of attenuation in Hz
Rp = 1 #maximum passband loss in dB
As = 60 #minimum stopband attenuation in dB
# Derived parameters
nyq = self.samplerate/2.0 #nyquist frequency of signal
bp_bw /= nyq
notch_bw /= 2.0 * nyq
hpass /= nyq
lpass /= nyq
notch /= nyq
# Bandpass (.05Hz - 120Hz)
self.bpB, self.bpA = iirdesign([hpass, lpass], [hpass-bp_bw, lpass+bp_bw], Rp, As, ftype='ellip')
# Bandstop (45Hz - 55Hz)
self.bsB, self.bsA = iirdesign([notch-notch_bw, notch+notch_bw], [notch-(notch_bw/2.0), notch+(notch_bw/2.0)], Rp, As, ftype='ellip')
# Connect Elements
self.ui.plotButton.clicked.connect(self.togglePlot)
self.ui.zoominButton.clicked.connect(self.zoomIn)
self.ui.zoomoutButton.clicked.connect(self.zoomOut)
self.ui.optionsButton.clicked.connect(self.newWindow)
GPIO.add_event_detect(21, GPIO.RISING, callback=self.togglePlot, bouncetime=300)
GPIO.add_event_detect(20, GPIO.FALLING, callback=self.newWindow, bouncetime=300)
GPIO.add_event_detect(16, GPIO.FALLING, callback=self.zoomIn, bouncetime=300)
GPIO.add_event_detect(12, GPIO.FALLING, callback=self.zoomOut, bouncetime=300)
# Show UI
self.ui.showMaximized()
def newWindow(self, channel):
self.options = SolUI.SolBeatMain()
def zoomIn(self, channel):
self.view.scaleBy(0.5)
def zoomOut(self, channel):
self.view.scaleBy(2.0)
def togglePlot(self, channel):
if(self.running):
self.running = False
self.ui.plotButton.setText("Start")
else:
self.running = True
self.ui.plotButton.setText("Stop")
self.getData()
def getData(self):
t = time.time()
bsz = bsz2 = bsz3 = lfilter_zi(self.bsB, self.bsA)
while (self.running):
t += self.period
val, val2, val3 = methods.sample()
# Filter values - cascade bandstop with bandpass
val, bsz = lfilter(self.bsB, self.bsA, lfilter(self.bpB, self.bpA, [val]), zi=bsz)
val2, bsz2 = lfilter(self.bsB, self.bsA, lfilter(self.bpB, self.bpA, [val2]), zi=bsz2)
val3, bsz3 = lfilter(self.bsB, self.bsA, lfilter(self.bpB, self.bpA, [val3]), zi=bsz3)
self.buffer.append(val + 2.5)
self.buffer2.append(val2 + 5)
self.buffer3.append(val3 + 7.5)
#SESSION RECORDING
if(self.session.recording):
self.session.data.append(val)
self.y[:] = self.buffer
self.y2[:] = self.buffer2
self.y3[:] = self.buffer3
self.curve.setData(self.x, self.y)
self.curve2.setData(self.x, self.y2)
self.curve3.setData(self.x, self.y3)
self.app.processEvents()
time.sleep(max(0, t-time.time()))
def save(self):
self.session.save()
def load(self):
self.session.load()
time = np.linspace(-(float(self.session.data.size)/self._bufsize)*10, 0.0, self.session.data.size)
self.curve.setData(time, self.session.data)
self.app.processEvents()
def closeEvent(self, event):
self.running = False
self.close
#########################
## Options screen ##
#########################
class options(QtGui.QWidget):
kbuttonDown,kbuttonUp,kbuttonRight,kbuttonLeft,kbuttonEsc,kbuttonEnt = QtCore.pyqtSignal(),QtCore.pyqtSignal(),QtCore.pyqtSignal(),QtCore.pyqtSignal(),QtCore.pyqtSignal(),QtCore.pyqtSignal()
def __init__(self):
#init window
QtGui.QWidget.__init__(self)
self.ui = uic.loadUi(os.path.dirname(os.path.abspath(__file__)) + '/ekgui/options.ui', self)
self.setWindowFlags(QtCore.Qt.FramelessWindowHint)
#init buttons
self.ui.enterButton.clicked.connect(self.enter)
self.ui.backButton.clicked.connect(self.back)
self.kbuttonEsc.connect(self.back)
self.kbuttonEnt.connect(self.enter)
self.ui.showMaximized()
self.setFocus()
self.ui.options.setFocus()
#triggers keyboard button press events
def keyPressEvent(self, event):
if event.key()==QtCore.Qt.Key_Right:
self.kbuttonRight.emit()
elif event.key()==QtCore.Qt.Key_Left:
self.kbuttonLeft.emit()
elif event.key()==QtCore.Qt.Key_Up:
self.kbuttonUp.emit()
elif event.key()==QtCore.Qt.Key_Down:
self.kbuttonDown.emit()
elif event.key()==QtCore.Qt.Key_Escape:
self.kbuttonEsc.emit()
elif event.key()==QtCore.Qt.Key_Enter or event.key()==QtCore.Qt.Key_Return:
self.kbuttonEnt.emit()
def back(self):
self.close()
def enter(self):
self.close()
#########################
## Sessions ##
#########################
class session:
def __init__(self):
self.patient = ''
self.timestamp = ''
self.recording = False
self.data = collections.deque()
#create or assign (existing) session
def new(self, patient, timestamp = datetime.now(), record = True):
self.patient = patient
self.timestamp = timestamp
self.recording = record
def save(self):
methods.save_ses(self.patient, self.timestamp, np.array(self.data))
def load(self):
self.data = methods.load_ses(self.patient, self.timestamp)