Hi Guys, (And warm greetings to the ladies amongst us)
Here's a pic of two 3V LED Chaser projects. It was difficult to snap a pic at the moment when both are lighted (even though they were chasing at high speed).
Between them might be the next project that I post, it very slowly dims and brightens its three colours, each at a slightly different rate. I used 30 degrees angle Ultrabright LEDs that make a magnificant display of 16 million colours on the ceiling. Every 10 minutes all LEDs are sync'd and are at their brightest, producing white, then 10 minutes later they all dim to nothing. All colours appear slowly in between.
The circuit uses a bootstrap technique so that the LEDs dim logarithmically, like our vision. At first I tried linear ramps, like the project that we already have, but it doesn't dim very much.