在两个 Arduino Mega 上使用 pyfirmata 读取模拟值的问题 [英] Problems with reading analog values with pyfirmata on two Arduino Mega's

问题描述

对于我的项目，我需要读取两个 Arduino Mega 上的多个模拟引脚.PWM 等其他任务运行良好，但在读取模拟引脚时，我只能从其中一块板上读取值.其他显示无:
A0 板 1:0.5601

For my project I need to read multiple analog pins on two Arduino Mega's. Other tasks like PWM are working perfectly well but when reading analog Pins I can only read values from one of the boards. The others show None:
A0 Board 1: 0.5601

A0 Board 2:无

如果我只使用一块板，它们都会读取正确的值，但一起显示始终没有.

If I'm using only one board both of them are reading the correct values but together one shows always none.

这是一个简单的代码来测试它:

Here is a simple code to test it:

from pyfirmata.util import Iterator
import time
import threading
from pyfirmata import ArduinoMega


def read_1():
    board1 = ArduinoMega("COM9")
    iterator = Iterator(board1)
    iterator.start()
    analog_0_board1 = board1.get_pin("a:0:i")
    while True:
        time.sleep(0.5)
        a = analog_0_board1.read()
        print("A0 Board 1: " + str(a))


def read_2():
    board2 = ArduinoMega("COM4")
    iterator = Iterator(board2)
    iterator.start()
    analog_0_board2 = board2.get_pin("a:0:i")
    while True:
        time.sleep(0.5)
        b = analog_0_board2.read()
        print("A0 Board 2: " + str(b))


x = threading.Thread(target=read_1)
x.start()

y = threading.Thread(target=read_2)
y.start()

我读过多处理可以解决这个问题，但我不知道如何在 pyfirmata 中正确使用它，而真正的循环和 tkinter.

I've read about multiprocessing could fix the problem but I don't know how to use it correctly with pyfirmata, while true loops and tkinter.

最好的问候和感谢

推荐答案

我设法解决了这个问题，也许我当前的代码可以帮助其他人.我写了以下代码，而不是线程部分:

I managed to solve the problem and maybe my current code can help other people. Instead of the threading part I wrote the following code:

if __name__ == "__main__":
    x = multiprocessing.Process(target=read_1)
    x.start()

    y = multiprocessing.Process(target=read_2)
    y.start()
    root.mainloop()

root.mainloop() 只是为了测试 tkinter 是否也可以.

The root.mainloop() is just to test if tkinter is also possible.

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