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== Python software ==
== Python software ==
from PyDAQmx import Task
from PyDAQmx.DAQmxConstants import *
from PyDAQmx.DAQmxTypes import *
import numpy
import msvcrt
import time
times = []
try :
freq = 100.0 # Hz
numinputs = 4
analog_input = Task()
read = int32()
timer= time.clock()
running = True
data = numpy.zeros((numinputs,), dtype=numpy.float64)
#DAQmx Configure Code
analog_input.CreateAIVoltageChan("Dev1/ai0:%i" % (numinputs - 1), None, DAQmx_Val_RSE, -10.0,10.0,DAQmx_Val_Volts,None)
#analog_input.CfgInputBuffer(0)
#analog_input.CfgSampClkTiming("",freq,DAQmx_Val_Rising,DAQmx_Val_ContSamps,1000)
analog_input.StartTask()
datalist = []
while running:
#DAQmx Start Code
timeBeforeRead = time.clock()
analog_input.ReadAnalogF64(-1,10.0,DAQmx_Val_GroupByChannel,data,numinputs*2,byref(read),None)
ser.write('S')
line = ser.readline()
time.sleep((1 / freq) - (time.clock()- timeBeforeRead))
times.append(timeBeforeRead - time.clock())
if msvcrt.kbhit():
running = False
finally :
print "Stop"
t = numpy.array(times)
afwijking = numpy.mean(abs(t - numpy.mean(t)))
maxafwijking = max(abs(t-numpy.mean(t)))
print numpy.mean(t), afwijking, maxafwijking
analog_input.StopTask();