Delphi Cookbook - Third Edition

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The built-in LED has been chosen so that no parts related to the electronic circuitry have to be added. This means that we have a minimal impact as the first demo. Obviously, the initialization of the LED and other features can easily be applied to the other pins and therefore to any other components. The base mechanism has already been shown. A recommendation I want to leave as we are talking about electronic circuits, however, is this:

"The voltage level output of a digital output pin is the same voltage that is powering the chip on the board. Most arduino boards use a +5vdc for the Vcc value, so output pins go from 0 to just short of +5vdc; however if the chip is powered from a 3.3vdc Vcc value, then the output pin will ...