I’ve been thinking about doing the soon-to-be-passe Christmas lights synched with music thing. The lights don’t come cheap; it’s $50 or so for a strand of 35.
Here’s a stripped-down version from Adafruit for $40: http://www.adafruit.com/blog/2012/07/18/updated-tutorial-12mm-led-pixels/
More holiday circuits, this one is for chirping Easter Eggs
Here’s a circuit for watering the livestock:
http://www.adafruit.com/blog/2012/07/19/stock-tank-filler-project-to-control-the-water-level-in-a-stock-tank-for-livestock-horses/
This should probably be put in with the CNC stuff, but I don’t want to confuse myself later:
low-power laser cutter CNC conversion The StarHam driver circuit is particularly interesting.
Directly upload Arduino sensor data to Google Docs note that you need to use POST, so best done via script, did not work for me via GET.