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Once dating app erklarung

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It's there for people reading the code: to explain what the program does, how it works, or why it's written the way it is. It's a good practice to comment your sketches, and to keep the comments up-to-date when you modify the code.

This helps other people to learn from or modify your code. There's another style for short, single-line comments. Variables A variable is a place for storing a piece of data.

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It has a name, a type, and a value. For example, the line from the Blink sketch above declares a variable with the name ledPin, the type int, and an initial value of It's being used to indicate which Arduino pin the LED is connected to. Every time the name ledPin appears in the code, its value will be retrieved.

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In this case, the person writing the program could have chosen not to bother creating the ledPin variable and instead have simply written 13 everywhere they needed to specify a pin number.

The advantage of using a variable is that it's easier to move the LED to a different pin: you only need to edit the one line that assigns the initial value to the variable.

Often, however, the value of a variable will change while the sketch runs. For example, you could store the value read from an input into a variable. There's more information in the Variables tutorial.

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Functions A function otherwise known as a procedure or sub-routine is a named piece of code that can be used from elsewhere in a sketch. The text before and after the name specify its return type and parameters: these will be explained later.

You can call a function that's already been defined either in your sketch or as part of the Arduino language. These parameters are used by the pinMode function to decide which pin and mode to set.

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When configured as an input, a pin can detect the state of a sensor like a pushbutton; this is discussed in a later tutorial. As an output, it can drive an actuator like an LED.

The digitalWrite functions outputs a value on a pin. Writing a LOW to pin connects it to ground, or 0 volts. The delay causes the Arduino to wait for the specified number of milliseconds before continuing on to the next line.

There are milliseconds in a second, so the line: delay ; creates a delay of one second. The setup is called once, when the sketch starts.

It's a good place to do setup tasks like setting pin modes or initializing libraries. The loop function is called over and over and is heart of most sketches.

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You need to include both functions in your sketch, even if you don't need them for anything. Change the code so that the LED is on for milliseconds and off for Change the code so that the LED turns on when the sketch starts and stays on.

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