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将 App Inventor 2 项目连接到外部传感器 · App Inventor 2 中文网

...this effort was to extend AppInventor’s toolset into the physical space, allowing users to easily interface with external sensors, actuators, and other hardware. The MOIO board[1] is a low-cost, programmable microcontroller and can provide input/output functionality for a wide range of applicatio...
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How do I split a string so I can access item x?

... This works but allocates a lot of memory and wastes CPU. – jjxtra May 26 '15 at 16:56 2 ...
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Intelligent point label placement in R

...implement INTELLIGENT label placement in R plot? I tried some but they are all problematic - many labels are overlaping either each other or other points (or other objects in the plot, but I see that this is much harder to handle). ...
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Android Camera Preview Stretched

... public class CameraPreview extends SurfaceView implements SurfaceHolder.Callback { private static final String TAG = "CameraPreview"; private Context mContext; private SurfaceHolder mHolder; private Camera mCamera; private List<Camera.Size> mSupportedPreviewSizes; p...
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How to do this using jQuery - document.getElementById(“selectlist”).value

...(s) from the jQuery one, use the following: $('#selectlist').get(); //get all DOM objects in the jQuery collection $('#selectlist').get(0); //get the DOM object in the jQuery collection at index 0 $('#selectlist')[0]; //get the DOM objects in the jQuery collection at index 0 ...
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Copying files using rsync from remote server to local machine

Once I've ssh'd into my remote server, what would the command be to copy all files from a directory to a local directory on my machine? ...
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Auto column width in EPPlus

...[Worksheet.Dimension.Address].AutoFitColumns(); Please note you need to call this method after filling the worksheet. share | improve this answer | follow | ...
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Does Git publicly expose my e-mail address?

... tools like 'git send-email' are written assuming that it's true (automatically cc'ing patch authors, for instance) – araqnid May 22 '09 at 19:06 2 ...
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Access properties file programmatically with Spring?

... If all you want to do is access placeholder value from code, there is the @Value annotation: @Value("${settings.some.property}") String someValue; To access placeholders From SPEL use this syntax: #('${settings.some.property...
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How to export a Vagrant virtual machine to transfer it

... You have two ways to do this, I'll call it dirty way and clean way: 1. The dirty way Create a box from your current virtual environment, using vagrant package command: http://docs.vagrantup.com/v2/cli/package.html Then copy the box to the other pc, add it u...