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+=====  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>
+/>
+<BR>
+Press the H with your left mouse button to toggle the High / Low output of the micro controller.
+<HR>
+<BR><BR>
+With the above we see the electronics/hardware side of the project. Now we will look at the software side.
+<BR>
+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.
+<BR>
+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).
+<BR>
+<BR><BR><BR>
+//Back to Index// [[UcInterfacingClass]]