The Raspberry Pi is a series of credit card-sized single-board computers developed in the United Kingdom by the Raspberry Pi Foundation to promote the teaching of basic computer science in schools and developing countries. Several generations of Raspberry Pis have been released:

Year	Raspberry Model	Characteristics	Max Power
2012	PI 1 Model A+	ARM V6 32 bit Single-core 700MHz BCM2835 – 256 MB RAM	5V. 700mA.
2014	PI 1 Model B+	ARM V6 32 bit Single-core 700MHz BCM2835 – 512 MB RAM	5V. 1.8A.
2015	Pi 2 Model B	ARM V7 32 bit Quad-Core 900MHz BCM2836 – 1 GB RAM	5V. 1.8A.
2015	Pi Zero	ARM V6-11 32 bit Single-Core 1GHz BCM2835 – 512 MB RAM	5V. 310 mA.
2016	Pi 3 Model B	ARM V8 64 bit Quad-Core 1.2GHz BCM2837 – 1 GB RAM	5V. 2.5A.

Raspberry PI 3 Features