PIC countdown timer
PIC 16F84A elapsed time counter on 4, 7 segment LED's
Fashing LED program for 16f877
Driving multiple bicolor LEDs in a matrix from and embedded controller
Using lookup tables to convert numbers to seven segment LED display patterns
Driving 8 or 9 7 segment displays with 8 or 9 io pins (and no extra circuitry)
Driving a bar graph display (up to 30 LEDs)
Area lighting with LED lightbulbs
General LED interfaceing
From the CHEAPIC tutorial:
PICList post "How to matrix bicolor LEDs?"
Hardware - The pin has a 470 ohm resistor and (Smurf-) blue LED to ground. Also a pushbutton switch and 10k resistor to V+.
What should happen:
What does happen:
I use the inverse (LED to vcc, push button low) of your circuit (with the extra resistor) on my graphic LCD checker:- http://ourworld.compuserve.com/homepages/steve_lawther/t6963tst.gif with no problems.
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<A HREF="http://www.piclist.com/techref/io/led/pic.htm"> Interfacing LEDs to PIC microcontrolers</A>
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