http://jackxiang.com/index.php zh-cn http://jackxiang.com/post// jack <xdy108@126.com> Fri, 20 Sep 2013 10:59:42 +0000 http://jackxiang.com/post// 淘宝上卖得有点高：http://item.taobao.com/item.htm?spm=a230r.1.0.0.uWRxwK&id=18906174315
参考：http://learn.adafruit.com/dht-humidity-sensing-on-raspberry-pi-with-gdocs-logging/overview

1.连线:

am2302不需要使用电阻，只需连接三个针脚即可（1，2，4）

1-->3.3v 既第一个针脚

2-->GPIO 可随意连接一个gpio针脚 (第7个阵脚，对应的是gpio pin 4)

3-->GND 连接接地针(连接的是第6个针脚)

然后参考http://learn.adafruit.com/dht-humidity-sensing-on-raspberry-pi-with-gdocs-logging/software-install，下载安装执行命令即可



简单记录仅供备忘。。。

来自：http://www.cnblogs.com/yaoshan/archive/2013/03/14/2924701.html

Adapting the DHT C code

Since the DHT sensors use a low-level "Manchester-esque" timing protocol to send data, we need to be able to read the pin they are connected to at very high speeds. The python libraries aren't fast enough, but the low level C libraries are! The code we wrote is a good example of how to deal with bitbang in user space, without the need to write a kernel driver

Grab the lowlevel BCM2835 C Library from http://www.open.com.au/mikem/bcm2835/index.html
$ wget http://www.open.com.au/mikem/bcm2835/bcm2835-1.8.tar.gz
$ tar -zxvf bcm2835-1.8.tar.gz
$ cd bcm2835-1.8
$ ./configure
$ make
$ sudo make install
Then compile the Adafruit_DHT program with

gcc Adafruit_DHT.c -l bcm2835 -std=gnu99 -o Adafruit_DHT ]]> http://jackxiang.com/post//#blogcomment <user@domain.com> Thu, 01 Jan 1970 00:00:00 +0000 http://jackxiang.com/post//#blogcomment