Created
September 30, 2015 08:22
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This takes data from random input or from a temperature server and sends it to a bokeh plot server
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import argparse | |
import numpy as np | |
import serial | |
import time | |
from bokeh.plotting import figure, output_server, cursession, show | |
from Instrulab import Instrulab | |
output_server("Temperature Plot") | |
# plot class | |
class AnalogPlot: | |
# constr | |
def __init__(self, strPort, maxLength): | |
# open serial port | |
#self.instrument = Instrulab(strPort) | |
self.maxLength = maxLength | |
self.plot = figure(plot_width=1200, plot_height=300) | |
self.plot.line([1,2,3], [1,2,3], color="#0000FF", name='probe0') | |
self.plot.line([1,2,3], [1,2,3], color="#FF0000", name='probe1') | |
self.plot.line([1,2,3], [1,-2,3], color="#00FF00", name='probe2') | |
self.plot.line([1,2,3], [1,2,-33], color="#880088", name='probe3') | |
show(self.plot) | |
self.numberOfPlots = 4 | |
self.dataSources = [] | |
self.time = 0.0 | |
for i in range(self.numberOfPlots): | |
renderer = self.plot.select(dict(name="probe"+str(i))) | |
self.dataSources.append(renderer[0].data_source) | |
# add data | |
def add(self, data): | |
assert(len(data) == self.numberOfPlots) | |
for index, dataSource in enumerate(self.dataSources): | |
dataSource.data["x"] = np.arange(self.time) | |
dataSource.data["y"] += [data[index]] | |
cursession().store_objects(dataSource) | |
# update plot | |
def update(self): | |
#data = self.instrument.getData() | |
data = 10 * np.random.randn(self.numberOfPlots) | |
self.add(data) | |
self.time += 1 | |
# main() function | |
def main(): | |
# create parser | |
parser = argparse.ArgumentParser(description="LDR serial") | |
# add expected arguments | |
#parser.add_argument('--port', dest='port', required=True) | |
# parse args | |
args = parser.parse_args() | |
strPort = '/dev/tty.USA19H141P1.1' | |
#strPort = args.port | |
#print('reading from serial port %s...' % strPort) | |
# plot parameters | |
analogPlot = AnalogPlot(strPort, 100) | |
print('plotting data...') | |
while True: | |
try: | |
analogPlot.update() | |
time.sleep(.5) | |
except KeyboardInterrupt: | |
print('exiting.') | |
exit() | |
# call main | |
if __name__ == '__main__': | |
main() |
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