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APP INVENTOR硬件交互学习教程04——蓝牙控制继电器 - 创客硬件开发 - 清泛...
这节主要是设计一个APP，连接蓝牙模块，通过按钮控制继电器的打开和关闭。
一、硬件部分
二、板子程序
串口接收字符，并输出控制继电器
// 引脚定义
const int ledPin1 = 5;// the number of the LED pin
const int ledPin2 = &...
BLE &APP交互学习教程02——接收指令 - 创客硬件开发 - 清泛IT社区，为创新赋能！
BLE模块性价比高，无需配对就可以连接使用，本节开始，我们来学习使用BLE接收并显示。1.界面设计
2.逻辑设计
3.APP工程
4.小结
BLE模块的发送和接收短接，APP发送来的数据模块接收后显示在输入框内。
iOS application: how to clear notifications?
I've an iOS application where some Push Notification are sent to. My problem is, that the messages/notifications stays in the Notification Center in iOS after then are tapped. How can I remove a notification for my application in the Notification Center next time the application opens?
...
How to manage local vs production settings in Django?
...
This approach means you have unversioned code running in development and production. And every developer has a different code base.I call anti-pattern here.
– pydanny
Jan 31 '13 at 16:25
...
How does one unit test routes with Express?
.../users', function(){
it('respond with json', function(done){
request(app)
.get('/users')
.set('Accept', 'application/json')
.expect(200)
.end(function(err, res){
if (err) return done(err);
done()
});
})
});
Upside: you can test your entire stac...
Objective-C ARC: strong vs retain and weak vs assign
...
After reading so many articles Stackoverflow posts and demo applications to check variable property attributes, I decided to put all the attributes information together:
atomic //default
nonatomic
strong=retain //default
weak
retain
assign //default
unsafe_un...
Xcode “The private key for is not installed on this mac - distributing”
I always get this message when I try to submit my app to the app store.
21 Answers
21
...
what's data-reactid attribute in html?
...y identify its components within the DOM.
This is important because React applications can be rendered at the server as well as the client. Internally React builds up a representation of references to the DOM nodes that make up your application (simplified version is below).
{
id: '.1oqi7occu80'...
Can you resolve an angularjs promise before you return it?
...
I cant describe with words how happy Im, you saved me so much time h.coates!
– rilar
Apr 2 '14 at 10:33
...
Setting Environment Variables for Node to retrieve
...onment variables (in this case) are being used to pass credentials to your application. USER_ID and USER_KEY can both be accessed from process.env.USER_ID and process.env.USER_KEY respectively. You don't need to edit them, just access their contents.
It looks like they are simply giving you the cho...