A useful and simple IO Shield for Arduino

In order to “visually” highlight the behavior of Arduino programs you must connect a device to the I/O pins, which gives you tangible signals. Normally, if you want to check if a program changes a level of an output pin, answering a command or executing a check routine, or event, you must check it by measuring the voltage level on the pin with a voltmeter. But if we connect this pin to a LED with the correc ...

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