The pi runs a reddit bot that reads the votes, and can switch on a pump to water. It also collects data about sunlight, moisture, temp and humidity to help inform the decision about watering. Despite many people's preconceptions about the goodness of the internet, I must admit that they do a wonderful job caring for my plant!
website: http://www.takecareofmyplant.com
subreddit w/ voting: http://old.reddit.com/r/takecareofmyplant
