IDG Contributor Network: Raspberry Pi-powered ghosts will haunt your house on Halloween

I have been busy playing with Raspberry Pi, Arduino board and electronics lately. I have been building projects for Halloween as my 4 year old son is super excited about it. We created a graveyard scene in our back patio and installed a projection system that runs a spooky projection show featuring ghosts and spirits hanging out in the graveyard. This project is about building a fully automated projection system using Raspberry Pi, Linux and open source scripts. I purchased special effects