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How many different configurations are used for software tests?

This article shows that for Android apps, software developers use between 30 and 50 different devices for compatibility tests. I tried to find information about tests of applications on "classic" ...
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we are planning to create a commercial product. The product consists of some MCUs and a small computer (we are developing on a Raspberry Pi at the moment). The computer needs an operating system as ...
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understanding computers [duplicate]

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How can I send a signal to a program via external hardware

I am trying to find a piece of hardware that will signal a program to start a timer when it is moving and stop when it stops. The hardware can just be a ball that moves and is connected to the ...