樹莓派執行狀態：CPU溫度，使用率，記憶體，硬碟，電壓等值

樹莓派系列1——樹莓派狀態讀取

前期準備

sudo pip install pip.gpio -timeout 6000

讀取樹莓派的狀態

建立raspberrypistate應用

建立

cd  /home/pi/helloworld
python manage.py startapp raspberrypistate

配置django

• 配置settings.py

cd helloworld
vim settings.py

settings.py 需要在INSTALLED_APPS

# Application definition

INSTALLED_APPS = [
    'raspberrypistate.apps.RaspberrypistateConfig',
    'django.contrib.admin',
    'django.contrib.auth',
    'django.contrib.contenttypes'
 
,
    'django.contrib.sessions',
    'django.contrib.messages',
    'django.contrib.staticfiles',
]

TEMPLATES = [
    {
        'BACKEND': 'django.template.backends.django.DjangoTemplates',
        'DIRS': [os.path.join(BASE_DIR, 'templates')],
        'APP_DIRS': True,
        'OPTIONS': {
            'context_processors'
 
: [
                'django.template.context_processors.debug',
                'django.template.context_processors.request',
                'django.contrib.auth.context_processors.auth',
                'django.contrib.messages.context_processors.messages',
            ],
        },
    },
]

• 配置urls.py

vim urls.py

urls.py更改為以下內容即可

from django.conf.urls import include, url
from django.contrib import admin
urlpatterns = [
    url(r'^raspberrypistate/', include('raspberrypistate.urls',namespace="raspberrypistate")),
    url(r'^admin/', admin.site.urls),
]

• Django接收raspberrypistate的更改

cd ..
python manage.py migrate
python manage.py makemigrations raspberrypistate

• 配置raspberrypistate的urls.py

cd raspberrypistate
vim urls.py

urls.py

from django.conf.urls import url

from . import views

urlpatterns = [
    url(r'^$', views.index, name='index'),
]

• 寫views.py

vim views.py

views.py

# -*- coding:utf-8 -*-
from django.http import HttpResponse

# Create your views here.
def index(request):
    return HttpResponse("Hello, world. 樹莓派狀態顯示")

初步配置完成，進行測試

測試django配置

• 重啟uwsgi服務

sudo systemctl restart emperor.uwsgi.service

讀取樹莓派CPU溫度

• 建立狀態讀取檔案state.py

vim state.py

state.py

# -*- coding:utf-8 -*-
import commands

def getCPUtemperature():
    res = commands.getoutput('vcgencmd measure_temp').replace( 'temp=', ''
    ).replace( '\'C', '' )
    tem = "CPU溫度: "+str(res)+"°C"
    return tem

• 更改views.py

 vim views.py 

views.py

# -*- coding:utf-8 -*-
from django.http import HttpResponse
from . import state

# Create your views here.
def index(request):
        tem=state.getCPUtemperature()
        return HttpResponse(tem)

• 重啟uwsgi服務

sudo systemctl restart emperor.uwsgi.service

讀取樹莓派狀態

• 修改state.py檔案

vim state.py

state.py

## -*- coding:utf-8 -*-
import commands

def getCPUtemperature():
    return float(commands.getoutput('vcgencmd measure_temp')\
                      .replace('temp=','').replace('\'C', ''))

def getRAMinfo():
    return commands.getoutput('free').split()[7:10]

def getCPUuse():
    return commands.getoutput("top -bcn 1").split()[24]

def getDiskSpace():
    return commands.getoutput("df -h /").split()[7:11]

def getPiVolts():
        volts=["core","sdram_c","sdram_i","sdram_p"]
        res={}
        for volt in volts:
                res[volt]=float(commands\
                                .getoutput("vcgencmd measure_volts "+volt)\
                                .replace('volt=','')\
                                .replace('V',''))
    return res

def getCPU():
    tem = "CPU溫度: "+str(getCPUtemperature())+"°C "
    RAM_info=getRAMinfo()
        inf = "RAM_total: "+str(round(int(RAM_info[0])/1000,1))+"MB  \
               RAM_used: "+str(round(int(RAM_info[1])/1000,1))+"MB  \
               RAM_free: "+str(round(int(RAM_info[2])/1000,1))+"MB  "
    use = "CPU使用率: "+str(getCPUuse())+"%  "
    disk_space=getDiskSpace()
    space = "硬碟容量: "+disk_space[0]+"B\
                 已用: "+disk_space[1]+"B  \
                 可用: "+disk_space[2]+"B  \
                 使用率: "+disk_space[3]+"  "
    pi_volts=getPiVolts();
    volts=""
    for volt,value in pi_volts.items():
                volts+=(volt+"電壓: "+str(round(value,2))+"V  ")
    CPUstate=tem+inf+use+space+volts
    return CPUstate

• 修改views.py檔案

vim views.py

views.py

# -*- coding:utf-8 -*-
from django.http import HttpResponse
from . import state

# Create your views here.
def index(request):
        tem=state.getCPU()
        return HttpResponse(tem)

• 重啟uwsgi服務

sudo systemctl restart emperor.uwsgi.service

歷時曲線製作學習中

待續。。。

參考教程