Peristaltic pump enclosure

This an enclosure for 12V DC motor based [peristaltic pump](https://www.adafruit.com/product/1150) from adafruit . The enclosure provides mounting holes for a 2.1 mm barrel jack (12 V DC power input), a latching SPST switch to switch on/off the pump and a 10K potentiometer to control the pump speed. This single peristaltic pump unit is used by reef-pi ato module to add fresh water in reef tanks when water level in tank drops due to evaporation (and detected using float switch). Detailed guide is at [adafruit](https://learn.adafruit.com/reef-pi-water-level-controller)