作者：hqiang1984

量化自我，极简主义

How to use WiringPi2 for Python on the Raspberry Pi in Raspbian part 1

http://raspi.tv/2013/how-to-use-wiringpi2-for-python-on-the-raspberry-pi-in-raspbian

 

http://wiringpi.com/wp-content/uploads/2013/03/pins.pdf

 

http://www.element14.com/community/docs/DOC-73950/l/raspberry-pi-2-model-b-gpio-40-pin-block-pinout

 

https://www.sparkfun.com/datasheets/Sensors/Temperature/DHT22.pdf

 

http://www.cnblogs.com/sn-dnv-aps/p/4390899.html

apt-get update 问题

环境：Ubuntu 14.04

使用apt-get update出现如下问题：

Fetched 11.8 MB in 26s (448 kB/s)
W: GPG error: http://security.debian.org wheezy/updates InRelease: The following signatures couldn’t be verified because the public key is not available: NO_PUBKEY 9D6D8F6BC857C906 NO_PUBKEY 8B48AD6246925553
W: GPG error: http://http.debian.net wheezy-updates Release: The following signatures couldn’t be verified because the public key is not available: NO_PUBKEY 8B48AD6246925553 NO_PUBKEY 7638D0442B90D010
W: Failed to fetch http://packages.couchbase.com/ubuntu/dists/trusty/InRelease Unable to find expected entry ‘precise/main/binary-amd64/Packages’ in Release file (Wrong sources.list entry or malformed file)

W: Failed to fetch http://http.debian.net/debian/dists/wheezy/Release.gpg Connection failed

 

解决方法，增加公共的key:
sudo apt-key adv –keyserver keyserver.ubuntu.com –recv-keys 9D6D8F6BC857C906 8B48AD6246925553 7638D0442B90D010 6FB2A1C265FFB764