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<div class="textblock"><h2>Callback functions </h2>
<h6>Attaching a function example:</h6>
<p>```c++ This example demonstrates how to attach a function to some line. The callback function will change a variable and write its value to a pin. It will be attached to <code>led_line</code> under the number 1.</p>
<p>... const byte ledPin = 3; We need a variable that holds the state. byte ledState = 0; <a class="el" href="class_liquid_line.html" title="Represents the individual lines printed on the display. ">LiquidLine</a> led_line(0, 0, "LED: ", ledState);</p>
<p>/* Callback functions for changing some state need to change the variable that is printed on the display and in this case write it to the appropriate pin. </p>
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