More Simple Arduino Goodness

After a little more fiddling on Friday night, I had a bunch of LEDs connected to one of the 595 shift registers following one of the Oomlout example circuits.

directly driving LEDs

I added a second shift register chained off the second to run another 8 LEDs, again following an example circuit, but this time from the Earthshine Arduino Guide.

Driving with a shift register

This naturally meant cool lighting effects.

Then I had a go at driving the LEDs at different duty cycles to vary their brightness. This is something I'll need to do with the 8x8 displays, so it seemed like a sensible plan to have a go with a simple circuit. It turns out it's not that hard to do:

Duty cycle demo