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deltaweight.py
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deltaweight.py
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#!/usr/bin/env python
import csv
from scale import Scale
import datetime as dt
import matplotlib.pyplot as plt
import matplotlib.animation as animation
import time
# Create figure for plotting
fig = plt.figure()
ax = fig.add_subplot(1, 1, 1)
xs = []
ys = []
thescale = Scale(10202)
starttime = time.time()
old_time = 0.0
old_weight = 0.0
with open('output.csv', 'w', newline='') as csvfile:
datawriter = csv.writer(csvfile, delimiter=';', quotechar='"', quoting=csv.QUOTE_MINIMAL)
datawriter.writerow(["deltatime","weight"])
def animate(i, xs, ys):
# Add x and y to lists
global old_time
global old_weight
time_last_received, weight = thescale.return_last_weight()
if time_last_received > old_time and weight != old_weight:
old_time = time_last_received
old_weight = weight
print('got new data', time_last_received, weight)
deltatime = time_last_received - starttime
xs.append(deltatime)
ys.append(weight) # Adds kg
datawriter.writerow([deltatime,weight])
# Limit x and y lists to 120 items, 1 sec per item
xs = xs[-120:]
ys = ys[-120:]
# Draw x and y lists
ax.clear()
ax.plot(xs, ys)
# Format plot
plt.xticks(rotation=45, ha='right')
plt.subplots_adjust(bottom=0.30)
plt.title('Weight kg over Time')
plt.ylabel('Weight kg')
else:
return
# Set up plot to call animate() function periodically
ani = animation.FuncAnimation(fig, animate, fargs=(xs, ys), interval=1000)
plt.show()
if __name__ == '__main__':
main()