Interfacing an LED
The simplest circuit. IO, resistor, LED and ground.<BR> <java_applet
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"
/> <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>
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