(Adafruit_Python_DHT - Raspberry Pi) 在 get_platform RuntimeError: Unknown platform [英] (Adafruit_Python_DHT - Raspberry Pi) in get_platform RuntimeError: Unknown platform

问题描述

我有一台与 DHT22 传感器相连的 Raspberry Pi 4，我想从我的传感器读取数据.

I have a Raspberry Pi 4 connected with a DHT22 sensor, and I want to read data from my sensor.

所以我安装了库 Adafruit_DHT

sudo pip3 install Adafruit_DHT

然后，我导航到目录 Adafruit_Python_DHT/examples/，然后，

then, I navigate to the directory Adafruit_Python_DHT/examples/, and then,

因为我有一个 DHT22 传感器连接到 GPIO pi n° 4，

since I have a DHT22 sensor connected to GPIO pi n° 4,

我跑

python AdafruitDHT.py 22 4

我明白了

(lab_app) root@Raspberry100:/var/www/lab_app/Adafruit_Python_DHT/examples# python AdafruitDHT.py 2302 4
Traceback (most recent call last):
  File "AdafruitDHT.py", line 41, in <module>
    humidity, temperature = Adafruit_DHT.read_retry(sensor, pin)
  File "/var/www/lab_app/lib/python3.8/site-packages/Adafruit_DHT-1.4.0-py3.8-linux-armv7l.egg/Adafruit_DHT/common.py", line 94, in read_retry
    humidity, temperature = read(sensor, pin, platform)
  File "/var/www/lab_app/lib/python3.8/site-packages/Adafruit_DHT-1.4.0-py3.8-linux-armv7l.egg/Adafruit_DHT/common.py", line 80, in read
    platform = get_platform()
  File "/var/www/lab_app/lib/python3.8/site-packages/Adafruit_DHT-1.4.0-py3.8-linux-armv7l.egg/Adafruit_DHT/common.py", line 63, in get_platform
    raise RuntimeError('Unknown platform.')
RuntimeError: Unknown platform.
(lab_app) root@Raspberry100:/var/www/lab_app/Adafruit_Python_DHT/examples# python AdafruitDHT.py 22 4
Traceback (most recent call last):
  File "AdafruitDHT.py", line 41, in <module>
    humidity, temperature = Adafruit_DHT.read_retry(sensor, pin)
  File "/var/www/lab_app/lib/python3.8/site-packages/Adafruit_DHT-1.4.0-py3.8-linux-armv7l.egg/Adafruit_DHT/common.py", line 94, in read_retry
    humidity, temperature = read(sensor, pin, platform)
  File "/var/www/lab_app/lib/python3.8/site-packages/Adafruit_DHT-1.4.0-py3.8-linux-armv7l.egg/Adafruit_DHT/common.py", line 80, in read
    platform = get_platform()
  File "/var/www/lab_app/lib/python3.8/site-packages/Adafruit_DHT-1.4.0-py3.8-linux-armv7l.egg/Adafruit_DHT/common.py", line 63, in get_platform
    raise RuntimeError('Unknown platform.')
RuntimeError: Unknown platform.
(lab_app) root@Raspberry100:/var/www/lab_app/Adafruit_Python_DHT/examples#

由于回溯表明

'未知平台.'

我对Adafruit_Python_DHT库的github仓库做了一点研究，发现脚本Adafruit_Python_DHT/Adafruit_DHT/common.py.
在这里我看到有一个 If/elif 结构 def get_platform() 旨在识别调用库的设备，但仅对 RPi 1、2 和 3 进行赋值，而 RPi缺少 4 个.
所以我敢打赌这就是错误 unknown platform 发生的原因.

I did a little research on the github repository of Adafruit_Python_DHT library, and I found the script Adafruit_Python_DHT/Adafruit_DHT/common.py.
Here I see there is an If/elif structure def get_platform() that aims to identify the device calling the library, but there is value assignment only for RPi 1, 2 and 3, while RPi 4 is missing.
So I bet this is the reason why the error unknown platform occurs.

我浏览了库源代码并找到了目录 Adafruit_Python_DHT/Adafruit_DHT/ ，其中最后一次提交显示包含 Raspberry Pi 4".
这是一个模块 platform_detect.py 似乎旨在以某种方式升级"库以识别 Raspberry Pi 4.

I navigated the library source code and I found out the directory Adafruit_Python_DHT/Adafruit_DHT/ , in which the last commit says "included Raspberry Pi 4".
Here is a module platform_detect.py that seems to be designed to somehow "upgrade" the library in order to recognize Raspberry Pi 4.

所以我尝试升级"我的图书馆这样做:

So I tryed to "upgrade" my library by doing this:

在(lab_app) root@Raspberry100:/var/www/lab_app/Adafruit_Python_DHT/Adafruit_DHT#,

我跑

platform_detect.py

而且我没有从提示中得到任何输出，所以我想一切都很顺利.

And I don't get any output from the prompt, so I guess everything has gone right.

然后我导航到目录 Adafruit_Python_DHT/examples/ 并再次运行

Then I navigate to the directory Adafruit_Python_DHT/examples/ and run again

python AdafruitDHT.py 22 4

但我仍然遇到同样的错误.

but I still get the same error.

那么如何使用 Adafruit_Python_DHT 库从连接到 GPIO pi n° 4 的 DHT22 传感器获取数据?

So how can I get data from a DHT22 sensor connected to GPIO pi n° 4 by using Adafruit_Python_DHT library?

推荐答案

SOLVED:

这不是一个干净的方法，但它解决了我的问题.

This isn't a clean method, but it solved my problem.

通过使用 Filezilla，我连接到了我的 Raspberry Pi 4，我导航到 Adafruit_Python_DHT/Adafruit_DHT/ 并下载了 platform_detect.py 和 common.py在我的本地电脑上.

By using Filezilla, I connected to my Raspberry Pi 4, I navigated to Adafruit_Python_DHT/Adafruit_DHT/ and downloaded platform_detect.py and common.py on my local pc.

然后我用Notepad++编辑这两个文件如下:

Then I edited these two files with Notepad++ as follows:

platform_detect.py

在第 112-144 行我替换了

At line 112-144 I substituted

else:
        # Something else, not a pi.
        return None

与:

else:
# Something else, like PI 4 MODEL B
# my personal changes to the code
    return 3

common.py

在第 62-63 行我替换了:

at lines 62-63 I substituted:

else:
    raise RuntimeError('Unknown platform.')

与:

else:
    #raise RuntimeError('Unknown platform.')
    """Use Pi 2 driver even though running on Pi 4"""
    #my personal changes to the code, do it only if you are using a RPi 2, 3 or 4.
    from . import Raspberry_Pi_2
    return Raspberry_Pi_2

然后我保存了这两个文件并将它们上传到我的 RPi4 上的同一目录中，从而重写了旧文件.

Then I saved the two files and uploaded them on the same directory on my RPi4, thus rewriting the older ones.

然后，在我的命令提示符下，我运行

Then, with my command prompt, I run

sudo su

然后我打开虚拟环境并导航到/var/www/lab_app/Adafruit_Python_DHT，我在这里运行:

then I turn up the virtual environment and navigate to /var/www/lab_app/Adafruit_Python_DHT, and here I run:

python setup.py install

现在安装库时没有我的提示显示任何平台检测错误.

And now the library gets installed without my prompt showing any error of platform detecting.

最后我导航到 /var/www/lab_app/Adafruit_Python_DHT/examples 并运行:

In the end I navigate to /var/www/lab_app/Adafruit_Python_DHT/examples and run:

python AdafruitDHT.py 22 4

图书馆工作，返回我的传感器跟踪的值

And the library works, returning me the values tracked by my sensor

温度=22.3* 湿度=54.1%

Temp=22.3* Humidity=54.1%

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