So I'm attempting on creating an irrigation system at home using an Arduino with Wireless + Solenoid valve and a few sensors. I wanted to create a small db to stores sensor data. The data would record at 1 min intervals so it wouldn't need to be a grunty server. My main question is, what would be the most cost effective, low power, small factor database server. I was thinking of using a Raspberry PI running Raspbian connected to a 1TB external HDD which would be under < $200, alternatively I could go for something more scale-able and get a small Celeron/i3 Intel NUC. Has anyone had a similar project/dilemma?