首先是源码：
代码语言：javascript复制 1 # -*- utf-8 -*-
2 #env !/usr/bin/python
3
4 import RPi.GPIO as GPIO
5 import time
6 import json
7 import datetime
8 import requests
9
10 requests.adapters.DEFAULT_RETRIES = 5
11 # s = requests.session()
12 # s.keep_alive = False
13 apiurl = 'https://xxxxxx.cn/api/TmpApi'
14 apiheaders = {'Content-Type': 'application/json','Connection': 'close'}
15
16 def getCPUTemp():
17 file = open("/sys/class/thermal/thermal_zone0/temp")
18 cpuTemp=float(file.read())/1000
19 file.close()
20 return cpuTemp
21
22 def getTemp():
23 channel = 17
24 data = []
25 j = 0
26
27 GPIO.setmode(GPIO.BCM)
28
29 time.sleep(1)
30
31 GPIO.setup(channel, GPIO.OUT)
32
33 GPIO.output(channel, GPIO.LOW)
34 time.sleep(0.02)
35 GPIO.output(channel, GPIO.HIGH)
36
37 GPIO.setup(channel, GPIO.IN)
38
39 while GPIO.input(channel) == GPIO.LOW:
40 continue
41
42 while GPIO.input(channel) == GPIO.HIGH:
43 continue
44
45 while j < 40:
46 k = 0
47 while GPIO.input(channel) == GPIO.LOW:
48 continue
49
50 while GPIO.input(channel) == GPIO.HIGH:
51 k = 1
52 if k > 100:
53 break
54
55 if k < 8:
56 data.append(0)
57 else:
58 data.append(1)
59
60 j = 1
61
62 print("sensor is working.")
63 # print(data)
64
65 humidity_bit = data[0:8]
66 humidity_point_bit = data[8:16]
67 temperature_bit = data[16:24]
68 temperature_point_bit = data[24:32]
69 check_bit = data[32:40]
70
71 humidity = 0
72 humidity_point = 0
73 temperature = 0
74 temperature_point = 0
75 check = 0
76
77 cpu_temperature = 0
78
79 for i in range(8):
80 humidity = humidity_bit[i] * 2 ** (7 - i)
81 humidity_point = humidity_point_bit[i] * 2 ** (7 - i)
82 temperature = temperature_bit[i] * 2 ** (7 - i)
83 temperature_point = temperature_point_bit[i] * 2 ** (7 - i)
84 check = check_bit[i] * 2 ** (7 - i)
85
86 tmp = humidity humidity_point temperature temperature_point
87
88 csv=open('/home/pi/Desktop/Projects/DHT11/log.csv', 'a ')
89 if humidity>99:
90 return "Wrong data"
91 if check == tmp:
92 print("temperature : ", temperature, ", humidity : " , humidity)
93 cpu_temperature = getCPUTemp()
94 print("CPU Temperature : ", cpu_temperature)
95
96 CurTime = datetime.datetime.now()
97 payload = {'DeviceName':"DHT11a",'Temp':temperature,'Humidity':humidity,'AcquisitionTime':CurTime.isoformat(), 'Memo': 'cpu:%.3f' % cpu_temperature}
98 print("Current time: %s" % CurTime.isoformat())
99 print("Upload Temperature: %.3f" % temperature,"Humdity: %.3f" % humidity)
100
101 jdata = json.dumps(payload)
102
103 r=requests.post(apiurl,headers=apiheaders,data=json.dumps(payload))
104
105 csv.write(time.strftime("%Y/%m/%d %H:%M:%S",time.localtime()) ",")
106 csv.write(str(temperature))
107 csv.write(',')
108 csv.write(str(humidity))
109 csv.write('n')
110 else:
111 # print("wrong")
112 r = "wrong"
113 print("temperature : ", temperature, ", humidity : " , humidity, " check : ", check, " tmp : ", tmp)
114
115 csv.close()
116
117 return r
118
119 if __name__ == "__main__":
120 try:
121 while 1:
122 resp = getTemp()
123 print("xxxxxx.cn request result: %s" %resp)
124 time.sleep(60)
125 finally:
126 GPIO.cleanup()错误故障：
代码语言：javascript复制 1 sensor is working.
2 temperature : 24 , humidity : 44
3 CPU Temperature : 47.236
4 Current time: 2018-09-14T04:37:06.303399
5 Upload Temperature: 24.000 Humdity: 44.000
6 xxxxxx.cn request result: <Response [201]>
7 sensor is working.
8 temperature : 16 , humidity : 50 check : 161 tmp : 78
9 xxxxxx.cn request result: wrong
10 sensor is working.
11 temperature : 24 , humidity : 55
12 CPU Temperature : 46.698
13 Current time: 2018-09-14T04:39:08.722444
14 Upload Temperature: 24.000 Humdity: 55.000
15 Traceback (most recent call last):
16 File "/usr/lib/python3/dist-packages/urllib3/connection.py", line 138, in _new_conn
17 (self.host, self.port), self.timeout, **extra_kw)
18 File "/usr/lib/python3/dist-packages/urllib3/util/connection.py", line 75, in create_connection
19 for res in socket.getaddrinfo(host, port, family, socket.SOCK_STREAM):
20 File "/usr/lib/python3.5/socket.py", line 733, in getaddrinfo
21 for res in _socket.getaddrinfo(host, port, family, type, proto, flags):
22 socket.gaierror: [Errno -3] Temporary failure in name resolution
23
24 During handling of the above exception, another exception occurred:
25
26 Traceback (most recent call last):
27 File "/usr/lib/python3/dist-packages/urllib3/connectionpool.py", line 594, in urlopen
28 chunked=chunked)
29 File "/usr/lib/python3/dist-packages/urllib3/connectionpool.py", line 350, in _make_request
30 self._validate_conn(conn)
31 File "/usr/lib/python3/dist-packages/urllib3/connectionpool.py", line 837, in _validate_conn
32 conn.connect()
33 File "/usr/lib/python3/dist-packages/urllib3/connection.py", line 281, in connect
34 conn = self._new_conn()
35 File "/usr/lib/python3/dist-packages/urllib3/connection.py", line 147, in _new_conn
36 self, "Failed to establish a new connection: %s" % e)
37 requests.packages.urllib3.exceptions.NewConnectionError: <requests.packages.urllib3.connection.VerifiedHTTPSConnection object at 0x75aa01b0>: Failed to establish a new connection: [Errno -3] Temporary failure in name resolution
38
39 During handling of the above exception, another exception occurred:
40
41 Traceback (most recent call last):
42 File "/usr/lib/python3/dist-packages/requests/adapters.py", line 423, in send
43 timeout=timeout
44 File "/usr/lib/python3/dist-packages/urllib3/connectionpool.py", line 643, in urlopen
45 _stacktrace=sys.exc_info()[2])
46 File "/usr/lib/python3/dist-packages/urllib3/util/retry.py", line 363, in increment
47 raise MaxRetryError(_pool, url, error or ResponseError(cause))
48 requests.packages.urllib3.exceptions.MaxRetryError: HTTPSConnectionPool(host='xxxxxx.cn', port=443): Max retries exceeded with url: /api/TmpApi (Caused by NewConnectionError('<requests.packages.urllib3.connection.VerifiedHTTPSConnection object at 0x75aa01b0>: Failed to establish a new connection: [Errno -3] Temporary failure in name resolution',))
49
50 During handling of the above exception, another exception occurred:
51
52 Traceback (most recent call last):
53 File "dht11GV.py", line 121, in <module>
54 resp = getTemp()
55 File "dht11GV.py", line 102, in getTemp
56 r=requests.post(apiurl,headers=apiheaders,data=json.dumps(payload))
57 File "/usr/lib/python3/dist-packages/requests/api.py", line 110, in post
58 return request('post', url, data=data, json=json, **kwargs)
59 File "/usr/lib/python3/dist-packages/requests/api.py", line 56, in request
60 return session.request(method=method, url=url, **kwargs)
61 File "/usr/lib/python3/dist-packages/requests/sessions.py", line 488, in request
62 resp = self.send(prep, **send_kwargs)
63 File "/usr/lib/python3/dist-packages/requests/sessions.py", line 609, in send
64 r = adapter.send(request, **kwargs)
65 File "/usr/lib/python3/dist-packages/requests/adapters.py", line 487, in send
66 raise ConnectionError(e, request=request)
67 requests.exceptions.ConnectionError: HTTPSConnectionPool(host='xxxxxx.cn', port=443): Max retries exceeded with url: /api/TmpApi (Caused by NewConnectionError('<requests.packages.urllib3.connection.VerifiedHTTPSConnection object at 0x75aa01b0>: Failed to establish a new connection: [Errno -3] Temporary failure in name resolution',))根据错误提示
代码语言：javascript复制Max retries exceeded with url: /api/TmpApi (Caused by NewConnectionError('<requests.packages.urllib3.connection.VerifiedHTTPSConnection object at 0x75aa01b0>:
Failed to establish a new connection: [Errno -3] Temporary failure in name resolution在网上找到以下几个点：
1. requests 模块太老，须升级：
代码语言：javascript复制pip install --upgrade requests2. 连接数太多，没有释放：
代码语言：javascript复制解决办法：
1、增加重试连接次数
requests.adapters.DEFAULT_RETRIES = 5
2、关闭多余的连接
requests使用了urllib3库，默认的http connection是keep-alive的，requests设置False关闭。
操作方法
s = requests.session()
s.keep_alive = False3. 加代理服务器：
代码语言：javascript复制http://obroll.com/max-retries-exceeded-for-url-in-requests-module-python-solved/
A:
Python代码
proxy = {'http': '33.33.33.10:8118'}
result = requests.get(url, proxies=proxy)
B:
Java代码
proxy = '33.33.33.11:8118'
result = requests.get(url, proxies={'http': proxy}) 分析：
因为是自建的网站，所以排除封锁IP的可能，所以代理服务器方法不用尝试。
尝试方法1和2，看后续效果。
