取得溫濕度
DHT22(AOSONG AM2302) 溫濕度元件在GitHub中有提供Raspberry Pi的python的程式讀取溫度與濕度
更新系統套件
執行指令：
sudo apt-get update
sudo apt-get upgrade接著要安裝所需要的相關套件
執行指令：
sudo apt-get install git build-essential python-dev執行結果：
pi@raspberrypi:~ $ sudo apt-get install git build-essential python-dev
Reading package lists... Done
Building dependency tree
Reading state information... Done
build-essential is already the newest version (12.3).
The following additional packages will be installed:
git-man liberror-perl libexpat1-dev libpython-dev libpython2.7 libpython2.7-dev python2.7-dev
Suggested packages:
git-daemon-run | git-daemon-sysvinit git-doc git-el git-email git-gui gitk gitweb git-arch git-cvs git-mediawiki git-svn
The following NEW packages will be installed:
git git-man liberror-perl libexpat1-dev libpython-dev libpython2.7 libpython2.7-dev python-dev python2.7-dev
0 upgraded, 9 newly installed, 0 to remove and 0 not upgraded.
Need to get 33.7 MB of archives.
After this operation, 67.0 MB of additional disk space will be used.
Do you want to continue? [Y/n] y
Get:1 http://mirror.ossplanet.net/raspbian/raspbian stretch/main armhf liberror-perl all 0.17024-1 [26.9 kB]
Get:2 http://mirror.ossplanet.net/raspbian/raspbian stretch/main armhf git-man all 1:2.11.0-3+deb9u2 [1,432 kB]
Get:9 http://raspbian.raspberrypi.org/raspbian stretch/main armhf python-dev armhf 2.7.13-2 [1,130 B]
Get:3 http://mirror.ossplanet.net/raspbian/raspbian stretch/main armhf git armhf 1:2.11.0-3+deb9u2 [3,380 kB]
Get:4 http://mirror.ossplanet.net/raspbian/raspbian stretch/main armhf libexpat1-dev armhf 2.2.0-2+deb9u1 [116 kB]
Get:5 http://mirror.ossplanet.net/raspbian/raspbian stretch/main armhf libpython2.7 armhf 2.7.13-2+deb9u2 [914 kB]
Get:6 http://mirror.ossplanet.net/raspbian/raspbian stretch/main armhf libpython2.7-dev armhf 2.7.13-2+deb9u2 [27.6 MB]
Get:7 http://mirror.ossplanet.net/raspbian/raspbian stretch/main armhf libpython-dev armhf 2.7.13-2 [20.0 kB]
Get:8 http://mirror.ossplanet.net/raspbian/raspbian stretch/main armhf python2.7-dev armhf 2.7.13-2+deb9u2 [286 kB]
Fetched 33.7 MB in 37s (911 kB/s)
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pi@raspberrypi:~ $下載程式碼
以上所需要的套件安裝完成後，透過git指令把放在github上的程式clone到Raspberry Pi中
執行指令：
cd ~
git clone https://github.com/adafruit/Adafruit_Python_DHT.git執行結果：
pi@raspberrypi:~ $ git clone https://github.com/adafruit/Adafruit_Python_DHT.git
Cloning into 'Adafruit_Python_DHT'...
remote: Counting objects: 249, done.
remote: Total 249 (delta 0), reused 0 (delta 0), pack-reused 249
Receiving objects: 100% (249/249), 77.01 KiB | 0 bytes/s, done.
Resolving deltas: 100% (142/142), done.安裝Adafruit_Python_DHT
執行指令：
cd Adafruit_Python_DHT
sudo python setup.py install執行結果：
pi@raspberrypi:~/Adafruit_Python_DHT $ sudo python setup.py install
Extracting in /tmp/tmphYQXtG
Now working in /tmp/tmphYQXtG/setuptools-4.0.1
Building a Setuptools egg in /home/pi/Adafruit_Python_DHT
/home/pi/Adafruit_Python_DHT/setuptools-4.0.1-py2.7.egg
running install
running bdist_egg
running egg_info
creating Adafruit_DHT.egg-info
writing Adafruit_DHT.egg-info/PKG-INFO
writing top-level names to Adafruit_DHT.egg-info/top_level.txt
writing dependency_links to Adafruit_DHT.egg-info/dependency_links.txt
writing manifest file 'Adafruit_DHT.egg-info/SOURCES.txt'
reading manifest file 'Adafruit_DHT.egg-info/SOURCES.txt'
writing manifest file 'Adafruit_DHT.egg-info/SOURCES.txt'
installing library code to build/bdist.linux-armv7l/egg
running install_lib
running build_py
creating build
creating build/lib.linux-armv7l-2.7
creating build/lib.linux-armv7l-2.7/Adafruit_DHT
copying Adafruit_DHT/Beaglebone_Black.py -> build/lib.linux-armv7l-2.7/Adafruit_DHT
copying Adafruit_DHT/Raspberry_Pi.py -> build/lib.linux-armv7l-2.7/Adafruit_DHT
copying Adafruit_DHT/Raspberry_Pi_2.py -> build/lib.linux-armv7l-2.7/Adafruit_DHT
copying Adafruit_DHT/platform_detect.py -> build/lib.linux-armv7l-2.7/Adafruit_DHT
copying Adafruit_DHT/Test.py -> build/lib.linux-armv7l-2.7/Adafruit_DHT
copying Adafruit_DHT/__init__.py -> build/lib.linux-armv7l-2.7/Adafruit_DHT
copying Adafruit_DHT/common.py -> build/lib.linux-armv7l-2.7/Adafruit_DHT
running build_ext
building 'Adafruit_DHT.Raspberry_Pi_2_Driver' extension
creating build/temp.linux-armv7l-2.7
creating build/temp.linux-armv7l-2.7/source
creating build/temp.linux-armv7l-2.7/source/Raspberry_Pi_2
arm-linux-gnueabihf-gcc -pthread -DNDEBUG -g -fwrapv -O2 -Wall -Wstrict-prototypes -fno-strict-aliasing -Wdate-time -D_FORTIFY_SOURCE=2 -g -fdebug-prefix-map=/build/python2.7-kKRR4y/python2.7-2.7.13=. -fstack-protector-strong -Wformat -Werror=format-security -fPIC -I/usr/include/python2.7 -c source/_Raspberry_Pi_2_Driver.c -o build/temp.linux-armv7l-2.7/source/_Raspberry_Pi_2_Driver.o -std=gnu99
arm-linux-gnueabihf-gcc -pthread -DNDEBUG -g -fwrapv -O2 -Wall -Wstrict-prototypes -fno-strict-aliasing -Wdate-time -D_FORTIFY_SOURCE=2 -g -fdebug-prefix-map=/build/python2.7-kKRR4y/python2.7-2.7.13=. -fstack-protector-strong -Wformat -Werror=format-security -fPIC -I/usr/include/python2.7 -c source/common_dht_read.c -o build/temp.linux-armv7l-2.7/source/common_dht_read.o -std=gnu99
arm-linux-gnueabihf-gcc -pthread -DNDEBUG -g -fwrapv -O2 -Wall -Wstrict-prototypes -fno-strict-aliasing -Wdate-time -D_FORTIFY_SOURCE=2 -g -fdebug-prefix-map=/build/python2.7-kKRR4y/python2.7-2.7.13=. -fstack-protector-strong -Wformat -Werror=format-security -fPIC -I/usr/include/python2.7 -c source/Raspberry_Pi_2/pi_2_dht_read.c -o build/temp.linux-armv7l-2.7/source/Raspberry_Pi_2/pi_2_dht_read.o -std=gnu99
arm-linux-gnueabihf-gcc -pthread -DNDEBUG -g -fwrapv -O2 -Wall -Wstrict-prototypes -fno-strict-aliasing -Wdate-time -D_FORTIFY_SOURCE=2 -g -fdebug-prefix-map=/build/python2.7-kKRR4y/python2.7-2.7.13=. -fstack-protector-strong -Wformat -Werror=format-security -fPIC -I/usr/include/python2.7 -c source/Raspberry_Pi_2/pi_2_mmio.c -o build/temp.linux-armv7l-2.7/source/Raspberry_Pi_2/pi_2_mmio.o -std=gnu99
arm-linux-gnueabihf-gcc -pthread -shared -Wl,-O1 -Wl,-Bsymbolic-functions -Wl,-z,relro -fno-strict-aliasing -DNDEBUG -g -fwrapv -O2 -Wall -Wstrict-prototypes -Wdate-time -D_FORTIFY_SOURCE=2 -g -fdebug-prefix-map=/build/python2.7-kKRR4y/python2.7-2.7.13=. -fstack-protector-strong -Wformat -Werror=format-security -Wl,-z,relro -Wdate-time -D_FORTIFY_SOURCE=2 -g -fdebug-prefix-map=/build/python2.7-kKRR4y/python2.7-2.7.13=. -fstack-protector-strong -Wformat -Werror=format-security build/temp.linux-armv7l-2.7/source/_Raspberry_Pi_2_Driver.o build/temp.linux-armv7l-2.7/source/common_dht_read.o build/temp.linux-armv7l-2.7/source/Raspberry_Pi_2/pi_2_dht_read.o build/temp.linux-armv7l-2.7/source/Raspberry_Pi_2/pi_2_mmio.o -lrt -o build/lib.linux-armv7l-2.7/Adafruit_DHT/Raspberry_Pi_2_Driver.so
creating build/bdist.linux-armv7l
creating build/bdist.linux-armv7l/egg
creating build/bdist.linux-armv7l/egg/Adafruit_DHT
copying build/lib.linux-armv7l-2.7/Adafruit_DHT/Beaglebone_Black.py -> build/bdist.linux-armv7l/egg/Adafruit_DHT
copying build/lib.linux-armv7l-2.7/Adafruit_DHT/Raspberry_Pi.py -> build/bdist.linux-armv7l/egg/Adafruit_DHT
copying build/lib.linux-armv7l-2.7/Adafruit_DHT/Raspberry_Pi_2.py -> build/bdist.linux-armv7l/egg/Adafruit_DHT
copying build/lib.linux-armv7l-2.7/Adafruit_DHT/Raspberry_Pi_2_Driver.so -> build/bdist.linux-armv7l/egg/Adafruit_DHT
copying build/lib.linux-armv7l-2.7/Adafruit_DHT/platform_detect.py -> build/bdist.linux-armv7l/egg/Adafruit_DHT
copying build/lib.linux-armv7l-2.7/Adafruit_DHT/Test.py -> build/bdist.linux-armv7l/egg/Adafruit_DHT
copying build/lib.linux-armv7l-2.7/Adafruit_DHT/__init__.py -> build/bdist.linux-armv7l/egg/Adafruit_DHT
copying build/lib.linux-armv7l-2.7/Adafruit_DHT/common.py -> build/bdist.linux-armv7l/egg/Adafruit_DHT
byte-compiling build/bdist.linux-armv7l/egg/Adafruit_DHT/Beaglebone_Black.py to Beaglebone_Black.pyc
byte-compiling build/bdist.linux-armv7l/egg/Adafruit_DHT/Raspberry_Pi.py to Raspberry_Pi.pyc
byte-compiling build/bdist.linux-armv7l/egg/Adafruit_DHT/Raspberry_Pi_2.py to Raspberry_Pi_2.pyc
byte-compiling build/bdist.linux-armv7l/egg/Adafruit_DHT/platform_detect.py to platform_detect.pyc
byte-compiling build/bdist.linux-armv7l/egg/Adafruit_DHT/Test.py to Test.pyc
byte-compiling build/bdist.linux-armv7l/egg/Adafruit_DHT/__init__.py to __init__.pyc
byte-compiling build/bdist.linux-armv7l/egg/Adafruit_DHT/common.py to common.pyc
creating stub loader for Adafruit_DHT/Raspberry_Pi_2_Driver.so
byte-compiling build/bdist.linux-armv7l/egg/Adafruit_DHT/Raspberry_Pi_2_Driver.py to Raspberry_Pi_2_Driver.pyc
creating build/bdist.linux-armv7l/egg/EGG-INFO
copying Adafruit_DHT.egg-info/PKG-INFO -> build/bdist.linux-armv7l/egg/EGG-INFO
copying Adafruit_DHT.egg-info/SOURCES.txt -> build/bdist.linux-armv7l/egg/EGG-INFO
copying Adafruit_DHT.egg-info/dependency_links.txt -> build/bdist.linux-armv7l/egg/EGG-INFO
copying Adafruit_DHT.egg-info/top_level.txt -> build/bdist.linux-armv7l/egg/EGG-INFO
writing build/bdist.linux-armv7l/egg/EGG-INFO/native_libs.txt
zip_safe flag not set; analyzing archive contents...
creating dist
creating 'dist/Adafruit_DHT-1.3.2-py2.7-linux-armv7l.egg' and adding 'build/bdist.linux-armv7l/egg' to it
removing 'build/bdist.linux-armv7l/egg' (and everything under it)
Processing setuptools-4.0.1-py2.7.egg
Copying setuptools-4.0.1-py2.7.egg to /usr/local/lib/python2.7/dist-packages
Adding setuptools 4.0.1 to easy-install.pth file
Installing easy_install script to /usr/local/bin
Installing easy_install-2.7 script to /usr/local/bin
Installed /usr/local/lib/python2.7/dist-packages/setuptools-4.0.1-py2.7.egg
Processing dependencies for setuptools==4.0.1
Finished processing dependencies for setuptools==4.0.1
Processing Adafruit_DHT-1.3.2-py2.7-linux-armv7l.egg
Copying Adafruit_DHT-1.3.2-py2.7-linux-armv7l.egg to /usr/local/lib/python2.7/dist-packages
Adding Adafruit-DHT 1.3.2 to easy-install.pth file
Installed /usr/local/lib/python2.7/dist-packages/Adafruit_DHT-1.3.2-py2.7-linux-armv7l.egg
Processing dependencies for Adafruit-DHT==1.3.2
Finished processing dependencies for Adafruit-DHT==1.3.2取得溫濕度
執行指令：
cd examples
sudo ./AdafruitDHT.py 2302 4執行結果：
pi@raspberrypi:~/Adafruit_Python_DHT $ cd examples/
pi@raspberrypi:~/Adafruit_Python_DHT/examples $ sudo ./AdafruitDHT.py 2302 4
Temp=26.6* Humidity=85.2%所顯示的Temp就是目前所讀取到的溫度，而Humidity就是濕度
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