python轮询机制控制led

最新推荐文章于 2023-07-18 15:34:21 发布

原创最新推荐文章于 2023-07-18 15:34:21 发布 · 1.1k 阅读

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本文介绍了一个基于Arduino和Python的系统，该系统通过串口读取湿度和温度数据，并将这些数据上传到云端服务器。系统使用了串口通信、时间管理、JSON数据格式化等技术，并实现了定时轮询的功能。

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# -*- coding:utf-8 -*- 
# File: ceshitianqi

import urllib2
import json
import time
import datetime
import serial  
import random
import os
import sys


APIKEY = 'ZPdLyl***='  #改成你的APIKEY
ser=serial.Serial("/dev/ttyUSB2",9600,timeout=1)

def read(key):
    ser.write(key)
    print("output:"+key)
    time.sleep(1)
    response = ser.readall()
    print(response)
    print(type(response))
    return response

def http_put(key):
    val = read(key) #获取Arduino的数据
    CurTime = datetime.datetime.now()
    url='http://api.heclouds.com/devices/**1/datapoints'
    #values={'datastreams':[{"id":"temp","datapoints":[{"at":CurTime.isoformat(),"value":val}]}]}
    print(type(val))
    if key== "a" :
      values={'datastreams':[{"id":"humidity","datapoints":[{"at":CurTime.isoformat(),"value":val}]}]}
    if key== "b" :
      values={'datastreams':[{"id":"temperature","datapoints":[{"at":CurTime.isoformat(),"value":val}]}]}
    jdata = json.dumps(values)                  # 对数据进行JSON格式化编码
    #打印json内容
    print jdata
    request = urllib2.Request(url, jdata)
    request.add_header('api-key', APIKEY)
    request.get_method = lambda:'POST'          # 设置HTTP的访问方式
    request = urllib2.urlopen(request)
    return request.read()   

str = ("a","b")
while True:
	for i in str:  
		f = open('1.txt')
		e = f.read()
		if e == "1\n":
			ser.write("c")
		if e == "0\n":
			ser.write("d")

		f.close()   
		resp = http_put(i)
      		time.sleep(2)

轮询1.txt

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