=====  Interfacing an LED  =====

The simplest circuit. IO, resistor, LED and ground.<BR>
<java_applet 
<code>
 code=Circuit
 height="156" width="500" 
 archive="Circuit.jar" 
 p1name="pause" p1value=20 
 p2name="startCircuit" p2value="led.txt" 
 p3name="startLabel"  p3value="Simple LED circuit" 
 p4name="useFrame" p4value="false"</code>
/>
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Press the H with your left mouse button to toggle the High / Low output of the micro controller.

<HR>
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With the above we see the electronics/hardware side of the project. Now we will look at the software side.
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The H/L part above that switches the LED on and off is connected to a specific pin on the uC, this pin is then mapped to either a memory location or a port. Changing the state of that location or port will change the state of the LED.
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Some uC's ( like the avr/arduinos) have tristate or bidirectional inputs, this is covered here [[UC_IO_Types]]. With these processors we tell the ports what they are, either input, output or do nothing(the third state).
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//Back to Index// [[UcInterfacingClass]]