The next tutorials are finished. I wrote two – one to show you, what is pulse-width modulation and what can do you with them, how you can use it. In the sketch we control the brightness of an LED with pulse-width modulation.   The other tutorial show you, how to use more Arduino Uno pins in your circuit. This little sketch is really easy, but this is the basic for the next circuit.

What is still missing us, is a switch in our circuits. And this is the theme in the next tutorial.

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