Opendate PM 2.5

Government Open Date Platform
https://data.gov.tw

Open Data EPA
https://opendata.epa.gov.tw

Open data file typ: csv, txt, JSON, XML


Two view of JSON file:

http://opendata.epa.gov.tw/ws/Data/POP00049/?$orderby=M_Time%20desc&$skip=0&$top=1000&format=json
<Please open this url by FireFox or JSON Editor Online website>

0
Epb	"嘉義縣"
CNO	"Q7600375"
Abbr	"南亞塑膠工業股份有限公司嘉義廠"
PolNo	"P001"
ItemDesc	"氮氧化物監測設施十五分鐘數據紀錄值"
Item	"923 "
M_Time	"2017-11-21 18:45:00"
M_Val	"83.75"
Unit	"ppm "
Code2	"10"
Code2Desc	"正常排放量測值"
Std	"250"
Std_s	"電力設施空氣污染物排放標準"

{"Epb":"嘉義縣","CNO":"Q7600375","Abbr":"南亞塑膠工業股份有限公司嘉義廠","PolNo":"P001","ItemDesc":"氮氧化物監測設施十五分鐘數據紀錄值","Item":"923 ","M_Time":"2017-11-21 18:45:00","M_Val":"83.75","Unit":"ppm    ","Code2":"10","Code2Desc":"正常排放量測值","Std":"250","Std_s":"電力設施空氣污染物排放標準"}

可以看到兩種結構組成:
物件(object)用大括號 { },分號隔開
例如:{"subject":"Math","score":80}
陣列(array)用中括號 [ ] ,分號:隔開
例如:[0,4,5,2,7,8,3]

JSON Editor Online

http://www.jsoneditoronline.org

open this url 

https://opendata.epa.gov.tw/webapi/api/rest/datastore/355000000I-000207?offset=0&limit=1000

Maxde-MacBook-Pro:taipei_PM2.5 max$ cat taipei_PM2.5_ver1.py 

#!/usr/bin/python

#-*- coding: UTF-8 -*-

import urllib, json

url = "http://opendata2.epa.gov.tw/AQI.json"

response = urllib.urlopen(url)

data_list = json.loads(response.read())

print  "城市:"

print   data_list[10]['County']

print  "地區:"

print   data_list[10]['SiteName']

print  "PM2.5指數:"

print   data_list[10]['PM2.5']

print  "狀態:"

print   data_list[10]['Status']

======

接RGB LED 進行判斷式 空氣品質->亮紅藍綠燈...

佈線圖在ppt

#!/usr/bin/python

#-*- coding: UTF-8 -*-

import urllib, json, pyfirmata

from time import sleep

#ser = serial.Serial("COM4",9600)

port = '/dev/cu.usbmodem1411'

pin1 = 11 #R

pin2 = 10 #G

pin3 = 8  #B

board = pyfirmata.Arduino(port) 

sleep(5)

url = "http://opendata2.epa.gov.tw/AQI.json"

response = urllib.urlopen(url)

data_list = json.loads(response.read())

print  "城市:"

print   data_list[3]['County']

print  "地區:"

print   data_list[3]['SiteName']

print  "PM2.5指數:"

print   data_list[3]['PM2.5']

print  "狀態:"

print   data_list[3]['Status']

    

a = int(data_list[3]['PM2.5'])

print a

#PM2.5介於0~5亮綠燈

if  a>0 and a<5:

    board.digital[pin2].write(1)

    print 'good'

    

#PM2.5介於5~10亮藍燈 

elif a>=5 and a<=10:

    board.digital[pin3].write(1)

    print 'bad'

    

#PM2.5大於10亮紅燈   

elif a>10:

    board.digital[pin1].write(1)

    print 'warning'

else:

    board.digital[pin1].write(0)

    board.digital[pin2].write(0)

    board.digital[pin3].write(0)

成功!!