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APP INVENTOR硬件交互学习教程11——滑条控制舵机 - 创客硬件开发 - 清泛IT...
这节我们通过滑条控件控制舵机动作。
1.界面设计
增加滑条控件和标签控件，滑条控制舵机动作，标签显示滑条数值。
2.逻辑设计
增加当滑条改变时，显示和发送指令给下位机
3.工程参考
【生成Python】AppInventor2中文网已支持代码块转换Python源码！ - App Inv...
...前瞻性。
咱作为“技术流派”，这么先进的设计理念和实用的功能，咱可不能忽视它，加之最近还有用户问AppInventor能否转Python代码，这不，这个功能不就来了嘛~~
先来个具体的例子，看看效果，写了一个生成3位水仙花数...
Typescript: difference between String and string
... setData(key: String = ``, data: object) {
sessionStorage.setItem(key, JSON.stringify(data));
}
getData(key: String = ``) {
const obj = JSON.parse(sessionStorage.getItem(key));
}
}
string primitive
// ok
class SVGStorageUtils {
store: object;
constructor(store: object) {
th...
What Are the Differences Between PSR-0 and PSR-4?
... see the namespaces and the directories that they are mapped to.
composer.json
"autoload": {
"psr-0": {
"Book\\": "src/",
"Vehicle\\": "src/"
}
}
Looking for Book\History\UnitedStates in src/Book/History/UnitedStates.php
Looking for Vehicle\Air\Wings\...
How to enter in a Docker container already running with a new TTY
...tebook.sh" 26 seconds ago Up 25 seconds 0.0.0.0:8989->9999/tcp SLURM_TASK-303337_0
1170fe9e9460 is the container id in this case.
Second, enter the docker :
docker exec -it [container_id] bash
so in the above case:
docker exec -it 1170fe9e9460 bash
...
When should TaskCompletionSource be used?
... has the old APM and EAP patterns, but not the awaitable Task methods that TcpListener and TcpClient have.
I personally have several issues with the NetworkStream class and prefer the raw Socket. Being that I also love the async/await pattern, I made an extension class SocketExtender which creates...
Preserve line breaks in angularjs
...lt;pre> wrapper will print text with \n as text
also if you print the json, for better look use json filter, like:
<div ng-repeat="item in items">
<pre>{{item.description|json}}</pre>
</div>
Demo
I agree with @Paul Weber that white-space: pre-wrap; is better appr...
Ways to implement data versioning in MongoDB
...ame time.
UPDATE: 2015-10
It looks like there is now a spec for handling JSON diffs. This seems like a more robust way to store the diffs / changes.
share
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Deep copying an NSArray
...
I have a workaround if trying to achieve deep copy for JSON compatible data.
Simply take NSData of NSArray using NSJSONSerialization and then recreate JSON Object, this will create a complete new and fresh copy of NSArray/NSDictionary with new memory references of them.
But mak...
get all keys set in memcached
...y and paste into shell):
function memcmd() {
exec {memcache}<>/dev/tcp/localhost/11211
printf "%s\n%s\n" "$*" quit >&${memcache}
cat <&${memcache}
}
Memcached 1.4.31 and above
You can use lru_crawler metadump all command to dump (most of) the metadata for (all of) the ite...