In SX Microcontrollers, SX/B Compiler and SX-Key Tool, Peter Van der Zee wrote:

Hi PJ;

The LEDs simply need to be electrically connected in a matrix fasion as per Guenther's layout. Physically of course they can be anywhere.

I suggest using Guenther's drawing, but eliminate the transistors unless you want large currents. My experience is that they just aren't required, as a few milliamps is plenty bright for most indoor applications.

Cheers,

Peter (pjv)

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