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Light Emitting Diode Displays


Driving 12 leds with 4 uController pins

From Mark Willis, Jeff King, Don McKenzie, Craig Lee 

(A)--\/\/--+-----+-----+
           #     |     |
           #     |     |
(B)--\/\/--+--+--(--+  |
              #  #  #  #
              #  #  #  #
(C)--\/\/--+--+--+  |  |
           #        |  |
           #        |  |
(D)--\/\/--+--------+--+

Where each ## in the diagram is actually two LED hooked "anti-parallel" like this:

 |----|<-----|
-|           |-
 |---->|-----|


ABCD  LED ON
----  ------
0000  none
1111  none
zzzz  none
01zz   1
10zz   2
0z1z   3
1z0z   4
z01z   5
z10z   6
0zz1   7
1zz0   8
zz01   9
zz10  10
z0z1  11
z1z0  12

Questions:

See also:

file: /Techref/io/led/12w4pins.htm, 2KB, , updated: 2007/4/2 12:58, local time: 2012/2/8 19:18,
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miSim DE is an excellent, portable and powerful IDE for developing PIC applications.
Editor, assembler, disassembler and simulator w/ virtual component "plugins" (LED,LCD,key,motor,TV,etc).
 

Robotics nuts!

Check out http://users.frii.com/dlc/robotics/projects/botproj.htm from Dennis Clark. This guy ROCKS! He has made (and sells but also releases code, docs, etc...) for a number of cool little robotic modules including whiskers, IR proximity detect and remote control, Sonar proximity detect, PWM, Servo, compass. Most of these use the little PIC 12C508 controller which costs basically nothing and is soooo tiny.
The 4 servos, 2400 baud serial servo controller is a wonder of magic and he sells the programmed chip for $8. Wow!

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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