如何从 matplotlib 动画中的串行端口更新值? [英] How to update values from serial port in matplotlib animations?

问题描述

我一直在尝试使用 matplotlib 的动画功能实时绘制来自 arduino 的串行数据.数据来自 ntc 温度传感器.我能够得到的图始终显示一条单线，并且该线仅随着温度的变化而向上或向下平移.我想知道如何查看代表绘图变化的曲线.代码如下:

I've been trying to plot serial data from an arduino in real-time using matplotlib's animation function. The data comes from a ntc temperature sensor. The plot I was able to get displays a sigle line all the time, and the line is only translated up or down as the teperature changes. I'd like to know what can I do to view the curves representing the changes in the plot. Here´s the code:

import serial
from matplotlib import pyplot as plt
from matplotlib import animation
import numpy as np

arduino = serial.Serial('COM3', 9600)

fig = plt.figure()
ax = plt.axes(xlim=(0, 10), ylim=(10, 40))
line, = ax.plot([], [], lw=2)

def init():
    line.set_data([], [])
    return line,

def animate(i):
    x = np.linspace(0, 10, 1000)
    y = arduino.readline()
    line.set_data(x, y)
    return line,

anim = animation.FuncAnimation(fig, animate, init_func=init, frames=200, interval=20,        blit=False)

plt.show()

推荐答案

您正在将 y 数据设置为单个点 (0, y).您想要执行以下操作:

You are setting the y-data to be a single point (0, y). You want to do something like:

max_points = 50
# fill initial artist with nans (so nothing draws)
line, = ax.plot(np.arange(max_points), 
                np.ones(max_points, dtype=np.float)*np.nan, 
                lw=2)
def init():
    return line,

def animate(i):
    y = arduino.readline()  # I assume this 
    old_y = line.get_ydata()  # grab current data
    new_y = np.r_[old_y[1:], y]  # stick new data on end of old data
    line.set_ydata(new_y)        # set the new ydata
    return line,

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