树莓派量天气的计划

树莓派天气监控 (在施工)

介绍 - 树莓派量天气的计划

我们英国的朋友常常问我们，你们在中国那边的气候怎么样？为了告诉他们所以我创造一台树莓派天气监测系统。 先我选择了传感器。我上网研究以后找到了DHT22温度和湿度传感器。 这个又便宜又有adafruit python library (adafruit就是个美国电子产品的公司)。 另外选择了BMP085传感器，这个可以量气压和温度。用这个的话我也可以把两个传感器数据算平均得温度。除了温度湿度气压以外，我也要表示空气的质量，因为不一定全国的地方都有污染的问题。量空气的质量很难不过airpi.es 用特别便宜的传感器。虽然这样不太准确 但是能算定性的测量。

一：硬件

树莓派一代modelA USB无线 电源 DHT22传感器 BMP085传感器 电线 来酸奶塑料桶用盒子

二：电路设计图

photo: setup

三：构成软件的基本

因为这个计划比较小，最好的系统就是raspbian-jessie-lite（raspbian小）。

  1. 下载RaspbianJessieLitedownload
  2. 构成无线（输入用户和密码）
  3. 下面的命令安装python啊，传感器需要的drivers啊等等.
sudo apt-get update
sudo apt-get install build-essential python-dev python-pip python-smbus
mkdir tianqiapp
cd tianqiapp
git clone https://github.com/adafruit/Adafruit_Python_DHT.git
git clone https://github.com/adafruit/Adafruit_Python_BMP.git
cd  Adafruit_Python_BMP
sudo python setup.py install
cd ..

wget abyz.co.uk/rpi/pigpio/pigpio.zip
unzip pigpio.zip
cd PIGPIO
make
sudo make install
sudo pigpiod

sudo raspi-config
(https://learn.adafruit.com/adafruits-raspberry-pi-lesson-4-gpio-setup/configuring-i2c)

sudo i2cdetect -y 1
scn shot

四：

cd Adafruit_Python_BMP sudo python simpletest.py

五python代码

把下面的代码存在SD卡。文件名：app.py

# import libraries
import sys, httplib, urllib, time, Adafruit_BMP.BMP085, DHT22, pigpio, atexit
BMP085sensor=Adafruit_BMP.BMP085.BMP085()
from config import *

# Setup RPi GPIO pins
PIN_DHT22=8

# update thingspeak routine (max once every 15 seconds)
def update_thingspeak(data1, data2, data3):
    params = urllib.urlencode({"field1": data1, "field2": data2, "field3": data3,'key':THINGSPEAK_APIWRITE})
    headers = {"Content-typZZe": "application/x-www-form-urlencoded","Accept": "text/plain"}
    conn = httplib.HTTPConnection("api.thingspeak.com:80")                
    try:
        conn.request("POST", "/update", params, headers)
        #response = conn.getresponse()
        #print response.status, response.reason
        #data = response.read()
        conn.close()
    except:
        pass
        # error handler if needed

# main loop
if __name__ == "__main__":

    pi = pigpio.pi()

    # Humidity and temp from DHT22
    s = DHT22.sensor(pi, PIN_DHT22, LED=None, power=8)   
    s.trigger()
    time.sleep(0.2)
    humidity=s.humidity()
    temp1=s.temperature()

    # temp and pressure from BMP085
    temp2=BMP085sensor.read_temperature()
    pressure = BMP085sensor.read_pressure()

    # calc average temp of 2 sensors
    temperature = 0
    temperature=(temp1+temp2)/2

    update_thingspeak(temperature, humidity ,pressure)#, airq)
    print "Temp: " + str(temperature)
    print "Humidity: " + str(humidity)
    print "Pressure: " + str(pressure)  
    pi.stop()
    sys.exit()

chmod +x app.py

http://docs.gadgetkeeper.com/pages/viewpage.action?pageId=7700673 http://www.instructables.com/id/Build-Your-First-IOT-with-a-Raspberry-Pi-DHT11-sen/?ALLSTEPS http://www.australianrobotics.com.au/news/how-to-talk-to-thingspeak-with-python-a-memory-cpu-monitor https://github.com/raddevon/pyspeak

六:

sudo crontab -e 0,15,30,45 /home/pi/tianqiapp/app.py &

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