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Python: FuncAnimation doesn't work in “while True” loop
Emulate a do-while loop in Python?open() in Python does not create a file if it doesn't existWhat is __future__ in Python used for and how/when to use it, and how it worksWhy does python use 'else' after for and while loops?Python: Checking if a 'Dictionary' is empty doesn't seem to workI need to find the location of a value in one numpy array and use it to refer to a value in the same location of another numpy arrayUpdating matplotlib.pyplot figure in pythongraph is not updating in the x-axis where the date and time is displayedPython, quitting matplotlib FuncAmination() when animation is fed by incoming sensor data`key_press_event` not working in python matplotlib FuncAnimation
I have a Raspberry Pi connected with an accelerometer. In Python, I'm want to draw a animated graph of X-axis value. It's a realtime graph that shows the change of X-axis value as I move the Pi in my hand. However the graph shows only the initial value.
from mpu6050 import mpu6050
from time import sleep
import numpy as np
import matplotlib.pyplot as plt
import matplotlib.animation as animation
from matplotlib import style
style.use("fivethirtyeight")
sensor = mpu6050(0x68)
print " waiting for the sensor to callibrate..."
sleep(2)
acc = np.empty((0,3), float) # storage for x, y, z axes values of the accelerometer
t = 0
time = np.empty((0,1), int) # time counter(this becomes the x axis of the graph)
fig = plt.figure()
ax1 = fig.add_subplot(1, 1, 1)
axis = 0 # accelerometer x axis. y axis = 1, z axis = 2
def animate(i):
ax1.clear()
ax1.plot(time, acc[:,axis])
while True:
accel_data = sensor.get_accel_data()
print("Accelerometer data")
print("x: " + str(accel_data['x']))
print("y: " + str(accel_data['y']))
print("z: " + str(accel_data['z']))
acc = np.append(acc, np.array([[accel_data['x'], accel_data['y'], accel_data['z']]]), axis=0)
# increment time array
time = np.append(time, t)
t = t + 1
print("acc[:,0]:" + str(acc[:,0]))
print("time:" + str(time))
ani = animation.FuncAnimation(fig, animate, interval = 1000)
plt.show()
sleep(2)
However, when I run the script, it only prints the value in the first loop like below. It also shows the graph but it's an empty graph because in the first loop there is only one data point.
waiting for the sensor to callibrate...
Accelerometer data
x: 6.2009822998
y: 3.36864173584
z: 9.27513723145
acc[:,0]: [ 6.2009823]
time: [0]
When I close the graph window, the loop resumes from the second loop and prints the values onwards, but the graph is never shown again.
Although it does not give any Error message, I assume something is wrong with animation.FuncAnimation or the place I should put plt.show() in the while loop.
I'm using Raspberry Pi 3b + with Python 2.7.13. Accelerometer is MPU6050.
It would be great if anybody could tell me how to fix this problem. Thank you!
python matplotlib animation graph raspberry-pi
asked Mar 7 at 20:27
Makoto MiyazakiMakoto Miyazaki
3372313
add a comment |
I have a Raspberry Pi connected with an accelerometer. In Python, I'm want to draw a animated graph of X-axis value. It's a realtime graph that shows the change of X-axis value as I move the Pi in my hand. However the graph shows only the initial value.
from mpu6050 import mpu6050
from time import sleep
import numpy as np
import matplotlib.pyplot as plt
import matplotlib.animation as animation
from matplotlib import style
style.use("fivethirtyeight")
sensor = mpu6050(0x68)
print " waiting for the sensor to callibrate..."
sleep(2)
acc = np.empty((0,3), float) # storage for x, y, z axes values of the accelerometer
t = 0
time = np.empty((0,1), int) # time counter(this becomes the x axis of the graph)
fig = plt.figure()
ax1 = fig.add_subplot(1, 1, 1)
axis = 0 # accelerometer x axis. y axis = 1, z axis = 2
def animate(i):
ax1.clear()
ax1.plot(time, acc[:,axis])
while True:
accel_data = sensor.get_accel_data()
print("Accelerometer data")
print("x: " + str(accel_data['x']))
print("y: " + str(accel_data['y']))
print("z: " + str(accel_data['z']))
acc = np.append(acc, np.array([[accel_data['x'], accel_data['y'], accel_data['z']]]), axis=0)
# increment time array
time = np.append(time, t)
t = t + 1
print("acc[:,0]:" + str(acc[:,0]))
print("time:" + str(time))
ani = animation.FuncAnimation(fig, animate, interval = 1000)
plt.show()
sleep(2)
However, when I run the script, it only prints the value in the first loop like below. It also shows the graph but it's an empty graph because in the first loop there is only one data point.
waiting for the sensor to callibrate...
Accelerometer data
x: 6.2009822998
y: 3.36864173584
z: 9.27513723145
acc[:,0]: [ 6.2009823]
time: [0]
When I close the graph window, the loop resumes from the second loop and prints the values onwards, but the graph is never shown again.
Although it does not give any Error message, I assume something is wrong with animation.FuncAnimation or the place I should put plt.show() in the while loop.
I'm using Raspberry Pi 3b + with Python 2.7.13. Accelerometer is MPU6050.
It would be great if anybody could tell me how to fix this problem. Thank you!
python matplotlib animation graph raspberry-pi
asked Mar 7 at 20:27
Makoto MiyazakiMakoto Miyazaki
3372313
No, you should not use a while loop at all. TheFuncAnimationitself can be seen as the loop that you want to use to change your plot.
– ImportanceOfBeingErnest
Mar 7 at 20:36
Thank you! But in order to continuously read and print the value from the accelerometer, I used while loop. Could you elaborate a bit more on how to useFuncAninationwithout while loop, and at the same time constantly read the value from the accelerometer?
– Makoto Miyazaki
Mar 7 at 20:57
FuncAnimationrepeatedly calls a function (in your caseanimate). Inside this function you do whatever you need to in order to continuously read and print the value from the accelerometer.
– ImportanceOfBeingErnest
Mar 7 at 21:01
Okay, so you mean I should read the accelerometer values inside theanimatefunction only once, thenFuncAnimationwill callanimaterepeatedly, with updated accelerometer values? Hope I understood you correctly.
– Makoto Miyazaki
Mar 7 at 21:07
add a comment |
I have a Raspberry Pi connected with an accelerometer. In Python, I'm want to draw a animated graph of X-axis value. It's a realtime graph that shows the change of X-axis value as I move the Pi in my hand. However the graph shows only the initial value.
from mpu6050 import mpu6050
from time import sleep
import numpy as np
import matplotlib.pyplot as plt
import matplotlib.animation as animation
from matplotlib import style
style.use("fivethirtyeight")
sensor = mpu6050(0x68)
print " waiting for the sensor to callibrate..."
sleep(2)
acc = np.empty((0,3), float) # storage for x, y, z axes values of the accelerometer
t = 0
time = np.empty((0,1), int) # time counter(this becomes the x axis of the graph)
fig = plt.figure()
ax1 = fig.add_subplot(1, 1, 1)
axis = 0 # accelerometer x axis. y axis = 1, z axis = 2
def animate(i):
ax1.clear()
ax1.plot(time, acc[:,axis])
while True:
accel_data = sensor.get_accel_data()
print("Accelerometer data")
print("x: " + str(accel_data['x']))
print("y: " + str(accel_data['y']))
print("z: " + str(accel_data['z']))
acc = np.append(acc, np.array([[accel_data['x'], accel_data['y'], accel_data['z']]]), axis=0)
# increment time array
time = np.append(time, t)
t = t + 1
print("acc[:,0]:" + str(acc[:,0]))
print("time:" + str(time))
ani = animation.FuncAnimation(fig, animate, interval = 1000)
plt.show()
sleep(2)
However, when I run the script, it only prints the value in the first loop like below. It also shows the graph but it's an empty graph because in the first loop there is only one data point.
waiting for the sensor to callibrate...
Accelerometer data
x: 6.2009822998
y: 3.36864173584
z: 9.27513723145
acc[:,0]: [ 6.2009823]
time: [0]
When I close the graph window, the loop resumes from the second loop and prints the values onwards, but the graph is never shown again.
Although it does not give any Error message, I assume something is wrong with animation.FuncAnimation or the place I should put plt.show() in the while loop.
I'm using Raspberry Pi 3b + with Python 2.7.13. Accelerometer is MPU6050.
It would be great if anybody could tell me how to fix this problem. Thank you!
python matplotlib animation graph raspberry-pi
asked Mar 7 at 20:27
Makoto MiyazakiMakoto Miyazaki
3372313
I have a Raspberry Pi connected with an accelerometer. In Python, I'm want to draw a animated graph of X-axis value. It's a realtime graph that shows the change of X-axis value as I move the Pi in my hand. However the graph shows only the initial value.
from mpu6050 import mpu6050
from time import sleep
import numpy as np
import matplotlib.pyplot as plt
import matplotlib.animation as animation
from matplotlib import style
style.use("fivethirtyeight")
sensor = mpu6050(0x68)
print " waiting for the sensor to callibrate..."
sleep(2)
acc = np.empty((0,3), float) # storage for x, y, z axes values of the accelerometer
t = 0
time = np.empty((0,1), int) # time counter(this becomes the x axis of the graph)
fig = plt.figure()
ax1 = fig.add_subplot(1, 1, 1)
axis = 0 # accelerometer x axis. y axis = 1, z axis = 2
def animate(i):
ax1.clear()
ax1.plot(time, acc[:,axis])
while True:
accel_data = sensor.get_accel_data()
print("Accelerometer data")
print("x: " + str(accel_data['x']))
print("y: " + str(accel_data['y']))
print("z: " + str(accel_data['z']))
acc = np.append(acc, np.array([[accel_data['x'], accel_data['y'], accel_data['z']]]), axis=0)
# increment time array
time = np.append(time, t)
t = t + 1
print("acc[:,0]:" + str(acc[:,0]))
print("time:" + str(time))
ani = animation.FuncAnimation(fig, animate, interval = 1000)
plt.show()
sleep(2)
However, when I run the script, it only prints the value in the first loop like below. It also shows the graph but it's an empty graph because in the first loop there is only one data point.
waiting for the sensor to callibrate...
Accelerometer data
x: 6.2009822998
y: 3.36864173584
z: 9.27513723145
acc[:,0]: [ 6.2009823]
time: [0]
When I close the graph window, the loop resumes from the second loop and prints the values onwards, but the graph is never shown again.
Although it does not give any Error message, I assume something is wrong with animation.FuncAnimation or the place I should put plt.show() in the while loop.
I'm using Raspberry Pi 3b + with Python 2.7.13. Accelerometer is MPU6050.
It would be great if anybody could tell me how to fix this problem. Thank you!
python matplotlib animation graph raspberry-pi
python matplotlib animation graph raspberry-pi
asked Mar 7 at 20:27
Makoto MiyazakiMakoto Miyazaki
3372313
asked Mar 7 at 20:27
Makoto MiyazakiMakoto Miyazaki
3372313
asked Mar 7 at 20:27
Makoto MiyazakiMakoto Miyazaki
3372313
asked Mar 7 at 20:27
Makoto MiyazakiMakoto Miyazaki
3372313
asked Mar 7 at 20:27
Makoto MiyazakiMakoto Miyazaki
3372313
3372313
No, you should not use a while loop at all. TheFuncAnimationitself can be seen as the loop that you want to use to change your plot.
– ImportanceOfBeingErnest
Mar 7 at 20:36
Thank you! But in order to continuously read and print the value from the accelerometer, I used while loop. Could you elaborate a bit more on how to useFuncAninationwithout while loop, and at the same time constantly read the value from the accelerometer?
– Makoto Miyazaki
Mar 7 at 20:57
FuncAnimationrepeatedly calls a function (in your caseanimate). Inside this function you do whatever you need to in order to continuously read and print the value from the accelerometer.
– ImportanceOfBeingErnest
Mar 7 at 21:01
Okay, so you mean I should read the accelerometer values inside theanimatefunction only once, thenFuncAnimationwill callanimaterepeatedly, with updated accelerometer values? Hope I understood you correctly.
– Makoto Miyazaki
Mar 7 at 21:07
add a comment |
No, you should not use a while loop at all. TheFuncAnimationitself can be seen as the loop that you want to use to change your plot.
– ImportanceOfBeingErnest
Mar 7 at 20:36
Thank you! But in order to continuously read and print the value from the accelerometer, I used while loop. Could you elaborate a bit more on how to useFuncAninationwithout while loop, and at the same time constantly read the value from the accelerometer?
– Makoto Miyazaki
Mar 7 at 20:57
FuncAnimationrepeatedly calls a function (in your caseanimate). Inside this function you do whatever you need to in order to continuously read and print the value from the accelerometer.
– ImportanceOfBeingErnest
Mar 7 at 21:01
Okay, so you mean I should read the accelerometer values inside theanimatefunction only once, thenFuncAnimationwill callanimaterepeatedly, with updated accelerometer values? Hope I understood you correctly.
– Makoto Miyazaki
Mar 7 at 21:07
No, you should not use a while loop at all. The
FuncAnimation itself can be seen as the loop that you want to use to change your plot.– ImportanceOfBeingErnest
Mar 7 at 20:36
No, you should not use a while loop at all. The
FuncAnimation itself can be seen as the loop that you want to use to change your plot.– ImportanceOfBeingErnest
Mar 7 at 20:36
Thank you! But in order to continuously read and print the value from the accelerometer, I used while loop. Could you elaborate a bit more on how to use
FuncAnination without while loop, and at the same time constantly read the value from the accelerometer?– Makoto Miyazaki
Mar 7 at 20:57
Thank you! But in order to continuously read and print the value from the accelerometer, I used while loop. Could you elaborate a bit more on how to use
FuncAnination without while loop, and at the same time constantly read the value from the accelerometer?– Makoto Miyazaki
Mar 7 at 20:57
FuncAnimation repeatedly calls a function (in your case animate). Inside this function you do whatever you need to in order to continuously read and print the value from the accelerometer.– ImportanceOfBeingErnest
Mar 7 at 21:01
FuncAnimation repeatedly calls a function (in your case animate). Inside this function you do whatever you need to in order to continuously read and print the value from the accelerometer.– ImportanceOfBeingErnest
Mar 7 at 21:01
Okay, so you mean I should read the accelerometer values inside the
animate function only once, then FuncAnimation will call animate repeatedly, with updated accelerometer values? Hope I understood you correctly.– Makoto Miyazaki
Mar 7 at 21:07
Okay, so you mean I should read the accelerometer values inside the
animate function only once, then FuncAnimation will call animate repeatedly, with updated accelerometer values? Hope I understood you correctly.– Makoto Miyazaki
Mar 7 at 21:07
add a comment |
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No, you should not use a while loop at all. The
FuncAnimationitself can be seen as the loop that you want to use to change your plot.– ImportanceOfBeingErnest
Mar 7 at 20:36
Thank you! But in order to continuously read and print the value from the accelerometer, I used while loop. Could you elaborate a bit more on how to use
FuncAninationwithout while loop, and at the same time constantly read the value from the accelerometer?– Makoto Miyazaki
Mar 7 at 20:57
FuncAnimationrepeatedly calls a function (in your caseanimate). Inside this function you do whatever you need to in order to continuously read and print the value from the accelerometer.– ImportanceOfBeingErnest
Mar 7 at 21:01
Okay, so you mean I should read the accelerometer values inside the
animatefunction only once, thenFuncAnimationwill callanimaterepeatedly, with updated accelerometer values? Hope I understood you correctly.– Makoto Miyazaki
Mar 7 at 21:07