Charlie-plexing

[Demon]

I can power pin 1:


I can power pin 4:


But I can't do the same thing at the same time, two unwanted LEDs come on:

Edit: I just noticed I missed another unwanted LED between pins 4 and 2.

I'll probably use a dedicated 18F24K22 running at 64MHz to manage the LEDs. I have to test, but blinking each LED individually might give enough persistence of vision (50 Hz or so).

I was initially planning on powering all LEDs active on one pin, but that might complicate things beyond my limitted abilities. I like to keep things simple.

I might also manage a simple keypad, not sure yet. I have enough pins, but tests will show how much the PIC can manage and still give satisfactory visual effects.

Robert