Raspberry pi connect temperature and humidity to onenet (移动云平台）

工具

树莓派3 modelB 一个

dht11温湿度传感器一个

onenet平台

安装好requests库的python（一定要安装好不然代码不能正确运行，可以参考我的另一篇博文点击打开链接）

树莓派连接温度传感器

将树莓派连接好温度传感器，并且得到数据，首先要运行代码，将传感器测得的温湿度数据分别用两个文件夹保存起来，代码一共分为两部分，一部分是测得传感器数据并将数据显示出来，第二部分是将数据以一定的格式储存起来，为后面上传做准备，废话不说直接上代码，博主比较懒，代码没什么注释，请见谅

#!/usr/bin/python
import RPi.GPIO as GPIO
import time
channel =4
data = []
j = 0
GPIO.setmode(GPIO.BCM)
time.sleep(1)
GPIO.setup(channel, GPIO.OUT)
GPIO.output(channel, GPIO.LOW)
time.sleep(0.02)
GPIO.output(channel, GPIO.HIGH)
GPIO.setup(channel, GPIO.IN)
while GPIO.input(channel) == GPIO.LOW:
continue
while GPIO.input(channel) == GPIO.HIGH:
continue
while j < 40:
k = 0
while GPIO.input(channel) == GPIO.LOW:
continue
while GPIO.input(channel) == GPIO.HIGH:
k += 1
if k > 100:
break
if k < 8:
data.append(0)
else:
data.append(1)
j += 1
print "sensor is working."
print data
humidity_bit = data[0:8]
humidity_point_bit = data[8:16]
temperature_bit = data[16:24]
temperature_point_bit = data[24:32]
check_bit = data[32:40]
humidity = 0
humidity_point = 0
temperature = 0
temperature_point = 0
check = 0
for i in range(8):
humidity += humidity_bit[i] * 2 ** (7-i)
humidity_point += humidity_point_bit[i] * 2 ** (7-i)
temperature += temperature_bit[i] * 2 ** (7-i)
temperature_point += temperature_point_bit[i] * 2 ** (7-i)
check += check_bit[i] * 2 ** (7-i)
tmp = humidity + humidity_point + temperature + temperature_point
if check == tmp:
print "temperature :", temperature, "*C, humidity :", humidity, "%"
else:
print "wrong"
print "temperature :", temperature, "*C, humidity :", humidity, "% check :", check, ", tmp :", tmp
#从这里开始是第二部分
mytemp = '%f' %temperature
myhumi = '%f' %humidity
tmp_output = open('/home/pi/pi/test/dht11/tmp_data.txt', 'w')
hud_output = open('/home/pi/pi/test/dht11/hum_data.txt', 'w')
tmp_output.write(mytemp)
hud_output.write(myhumi)
tmp_output.close
hud_output.close
GPIO.cleanup()

#!/usr/bin/python

import RPi.GPIO as GPIO

import time

channel =4

data = []

j = 0

GPIO.setmode(GPIO.BCM)

time.sleep(1)

GPIO.setup(channel, GPIO.OUT)

GPIO.output(channel, GPIO.LOW)

time.sleep(0.02)

GPIO.output(channel, GPIO.HIGH)

GPIO.setup(channel, GPIO.IN)

while GPIO.input(channel) == GPIO.LOW:

  continue

while GPIO.input(channel) == GPIO.HIGH:

  continue

while j < 40:

  k = 0

  while GPIO.input(channel) == GPIO.LOW:

    continue

  while GPIO.input(channel) == GPIO.HIGH:

    k += 1

    if k > 100:

      break

  if k < 8:

    data.append(0)

  else:

    data.append(1)

  j += 1

print "sensor is working."

print data

humidity_bit = data[0:8]

humidity_point_bit = data[8:16]

temperature_bit = data[16:24]

temperature_point_bit = data[24:32]

check_bit = data[32:40]

humidity = 0

humidity_point = 0

temperature = 0

temperature_point = 0

check = 0

for i in range(8):

  humidity += humidity_bit[i] * 2 ** (7-i)

  humidity_point += humidity_point_bit[i] * 2 ** (7-i)

  temperature += temperature_bit[i] * 2 ** (7-i)

  temperature_point += temperature_point_bit[i] * 2 ** (7-i)

  check += check_bit[i] * 2 ** (7-i)

tmp = humidity + humidity_point + temperature + temperature_point

if check == tmp:

  print "temperature :", temperature, "*C, humidity :", humidity, "%"

else:

  print "wrong"

  print "temperature :", temperature, "*C, humidity :", humidity, "% check :", check, ", tmp :", tmp

#从这里开始是第二部分

mytemp = '%f' %temperature

myhumi = '%f' %humidity

tmp_output = open('/home/pi/pi/test/dht11/tmp_data.txt', 'w')

hud_output = open('/home/pi/pi/test/dht11/hum_data.txt', 'w')

tmp_output.write(mytemp)

hud_output.write(myhumi)

tmp_output.close

hud_output.close

GPIO.cleanup()

运行代码后会出现两个文件分别来保存温度和湿度，如下图：

这样一来温湿度的数据就保存下来了，然后就是读取并上传了

上传数据至云端

上传之前，首先要将云物联网平台，现在的免费的云物联网平台有很多onenet、机智云、ubidots、yeelink，我选择的是onenet平台。首先你要注册好onenet平台账号，然后建立一个产品，如图所示

创建好之后有两个东西比较重要，一个是你的APIKey，还有一个是你的设备ID，设备ID可以在你的设备管理中看见，如图：

有了这两个东西后你还可以创建你的应用，这个应用可以接收到上传的数据并进行处理，使得数据更加直观，在你的应用管理里面可以创建，创建好的应用如图：

通过代码上传数据

上传温度数据代码

<span style="font-size: 18px;">import urllib2
import json
import time
import datetime
APIKEY = '你的APIKey'
def http_put():
file = open("/home/pi/pi/test/dht11/tmp_data.txt")
temperature= float(file.read())
CurTime = datetime.datetime.now()
url='http://api.heclouds.com/devices/你的设备ID/datapoints'
values={'datastreams':[{"id":"temp","datapoints":[{"at":CurTime.isoformat(),"value":temperature}]}]}
print "the time is: %s" %CurTime.isoformat()
print "The upload temperature value is: %.3f" %temperature
jdata = json.dumps(values)
print jdata
request = urllib2.Request(url, jdata)
request.add_header('api-key', APIKEY)
request.get_method = lambda:'POST'
request = urllib2.urlopen(request)
return request.read()
while True:
time.sleep(5)
resp = http_put()
print "OneNET result:\n %s" %resp
time.sleep(5)</span>

import urllib2

import json

import time

import datetime

APIKEY = '你的APIKey'  

def http_put():

        file = open("/home/pi/pi/test/dht11/tmp_data.txt")

        temperature= float(file.read())

        CurTime = datetime.datetime.now()

        url='http://api.heclouds.com/devices/你的设备ID/datapoints'

        values={'datastreams':[{"id":"temp","datapoints":[{"at":CurTime.isoformat(),"value":temperature}]}]}

        print "the time is: %s" %CurTime.isoformat()

        print "The upload temperature value is: %.3f" %temperature

        jdata = json.dumps(values)

        print jdata

        request = urllib2.Request(url, jdata)

        request.add_header('api-key', APIKEY)

        request.get_method = lambda:'POST'

        request = urllib2.urlopen(request)

        return request.read()

while True:

        time.sleep(5)

        resp = http_put()

        print "OneNET result:\n %s" %resp

        time.sleep(5)

上传湿度数据代码：

import urllib2
import json
import time
import datetime
APIKEY = '你的APIKey'
def http_put():
file = open("/home/pi/pi/test/dht11/hum_data.txt")
humidity= float(file.read())
CurTime = datetime.datetime.now()
url='http://api.heclouds.com/devices/11302038/datapoints'
values={'datastreams':[{"id":"hum","datapoints":[{"at":CurTime.isoformat(),"value":humidity}]}]}
print "the time is: %s" %CurTime.isoformat()
print "The upload humidity value is: %.3f" %humidity
jdata = json.dumps(values)
print jdata
request = urllib2.Request(url, jdata)
request.add_header('api-key', APIKEY)
request.get_method = lambda:'POST'
request = urllib2.urlopen(request)
return request.read()
time.sleep(5)
resp = http_put()
print "OneNET result:\n %s" %resp
file.closes

import urllib2

import json

import time

import datetime

APIKEY = '你的APIKey'  

def http_put():

        file = open("/home/pi/pi/test/dht11/hum_data.txt")

        humidity= float(file.read())

        CurTime = datetime.datetime.now()

        url='http://api.heclouds.com/devices/11302038/datapoints'

        values={'datastreams':[{"id":"hum","datapoints":[{"at":CurTime.isoformat(),"value":humidity}]}]}

        print "the time is: %s" %CurTime.isoformat()

        print "The upload humidity value is: %.3f" %humidity

        jdata = json.dumps(values)

        print jdata

        request = urllib2.Request(url, jdata)

        request.add_header('api-key', APIKEY)

        request.get_method = lambda:'POST'

        request = urllib2.urlopen(request)

        return request.read()

time.sleep(5)

resp = http_put()

print "OneNET result:\n %s" %resp

file.closes

数据流问题

上传之后我们一定要注意的是数据流的问题，就是我们有两种数据，一种是humidity，一种是temperature，你在编辑应用的时候就要注意数据流的选择如图

这个选择之前要在数据流管理那里创建温度和湿度数据流，你的代码的相应的数据那里也要改成和数据流名称一样的，湿度数据流t同理，一定要保证名字一样，不然就不会自动识别了，如图：

自动执行代码并上传数据

要实现代码的自动上传和运行，需要用到crontab命令，打开树莓派命令行界面输入：

sudo crontab -e

 sudo crontab -e

选择nano，也就是2，然后在最后几行添加这么几句话

*/1 * * * * python /home/pi/pi/test/dht11/transfer_tmp.py
*/1 * * * * python /home/pi/pi/test/dht11/transfer_hum.py
*/1 * * * * python /home/pi/pi/test/dht11/cpdht11.py

*/1 * * * * python /home/pi/pi/test/dht11/transfer_tmp.py

*/1 * * * * python /home/pi/pi/test/dht11/transfer_hum.py

*/1 * * * * python /home/pi/pi/test/dht11/cpdht11.py

如图：

添加之后保存，然后代码就能每隔一分钟运行一次，实现了自动上传功能，最后注意的的是在创建产品的过程中，传输协议一定要选HTTP协议，连接是移动蜂窝网，还有就是一定要安装好requests库模块，APIKey 和设备ID一定要准确。