Dartmouth Libraries have Arduino and Raspberry Pi kits available for checkout from Jones Media Center and Feldberg Library. You can borrow the Arduino Uno Starter Kit and the Raspberry Pi 3 Ultimate Starter Kit.
Arduino is an open-source electronics platform based on easy-to-use hardware and software. Arduino boards are able to read inputs - light on a sensor, a finger on a button, or a Twitter message - and turn it into an output - activating a motor, turning on an LED, publishing something online. You can tell your board what to do by sending a set of instructions to the microcontroller on the board. To do so you use the Arduino programming language (based on Wiring), and the Arduino Software (IDE), based on Processing. (Source)