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python轮询机制控制led实例

作者：Neil-Yale　　发布时间：2023-12-12 01:39:00　

标签：python,轮询,led

我就废话不多说了，大家还是直接看代码吧！

# -*- 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

1则点亮

0则关闭

补充知识：python笔记(轮询、长轮询)

一、轮询

views.py

from flask import Flask,render_template,request,jsonify

app = Flask(__name__)

USERS = {
'1':{'name':'贝贝','count':1},
'2':{'name':'小东北','count':0},
'3':{'name':'何伟明','count':0},
}

@app.route('/user/list')
def user_list():
import time
return render_template('user_list.html',users=USERS)

@app.route('/vote',methods=['POST'])
def vote():
uid = request.form.get('uid')
USERS[uid]['count'] += 1
return "投票成功"

@app.route('/get/vote',methods=['GET'])
def get_vote():

return jsonify(USERS)

if __name__ == '__main__':
app.run(threaded=True)

html

<!DOCTYPE html>
<html lang="zh-CN">
<head>
<meta charset="UTF-8">
<title>Title</title>
<meta name="viewport" content="width=device-width, initial-scale=1">
<style>
li{
cursor: pointer;
}
</style>
</head>
<body>
<ul id="userList">
{％ for key,val in users.items() ％}
<li uid="{{key}}">{{val.name}} ({{val.count}})</li>
{％ endfor ％}
</ul>

<script src="https://cdn.bootcss.com/jquery/3.3.0/jquery.min.js"></script>
<script>

$(function () {
$('#userList').on('dblclick','li',function () {
var uid = $(this).attr('uid');
$.ajax({
url:'/vote',
type:'POST',
data:{uid:uid},
success:function (arg) {
console.log(arg);
}
})
});

});

/*
获取投票信息
*/
function get_vote() {
$.ajax({
url:'/get/vote',
type:"GET",
dataType:'JSON',
success:function (arg) {
$('#userList').empty();
$.each(arg,function (k,v) {
var li = document.createElement('li');
li.setAttribute('uid',k);
li.innerText = v.name + "(" + v.count + ')' ;
$('#userList').append(li);
})

}
})
}

setInterval(get_vote,3000);

</script>
</body>
</html>

二、长轮询

views.py

from flask import Flask,render_template,request,jsonify,session
import uuid
import queue

app = Flask(__name__)
app.secret_key = 'asdfasdfasd'

USERS = {
'1':{'name':'贝贝','count':1},
'2':{'name':'小东北','count':0},
'3':{'name':'何伟明','count':0},
}

QUEQUE_DICT = {
}

@app.route('/user/list')
def user_list():
user_uuid = str(uuid.uuid4())
QUEQUE_DICT[user_uuid] = queue.Queue()

session['current_user_uuid'] = user_uuid
return render_template('user_list.html',users=USERS)

@app.route('/vote',methods=['POST'])
def vote():
uid = request.form.get('uid')
USERS[uid]['count'] += 1
for q in QUEQUE_DICT.values():
q.put(USERS)
return "投票成功"

@app.route('/get/vote',methods=['GET'])
def get_vote():
user_uuid = session['current_user_uuid']
q = QUEQUE_DICT[user_uuid]

ret = {'status':True,'data':None}
try:
users = q.get(timeout=5)
ret['data'] = users
except queue.Empty:
ret['status'] = False

return jsonify(ret)

if __name__ == '__main__':
app.run(threaded=True)

html

<!DOCTYPE html>
<html lang="zh-CN">
<head>
<meta charset="UTF-8">
<title>Title</title>
<meta name="viewport" content="width=device-width, initial-scale=1">
<style>
li{
cursor: pointer;
}
</style>
</head>
<body>
<ul id="userList">
{％ for key,val in users.items() ％}
<li uid="{{key}}">{{val.name}} ({{val.count}})</li>
{％ endfor ％}
</ul>

<script src="https://cdn.bootcss.com/jquery/3.3.0/jquery.min.js"></script>
<script>

$(function () {
$('#userList').on('click','li',function () {
var uid = $(this).attr('uid');
$.ajax({
url:'/vote',
type:'POST',
data:{uid:uid},
success:function (arg) {
console.log(arg);
}
})
});
get_vote();
});

/*
获取投票信息
*/
function get_vote() {
$.ajax({
url:'/get/vote',
type:"GET",
dataType:'JSON',
success:function (arg) {
if(arg.status){
$('#userList').empty();
$.each(arg.data,function (k,v) {
var li = document.createElement('li');
li.setAttribute('uid',k);
li.innerText = v.name + "(" + v.count + ')' ;
$('#userList').append(li);
})
}
get_vote();

}
})
}

</script>
</body>
</html>

来源：https://blog.csdn.net/yalecaltech/article/details/79979722

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python轮询机制控制led实例

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