Chapter 6 ■ Building low-Cost MysQl data nodes
Models
The choices for Raspberry Pi boards have grown to include four models with several versions and iterations.
I outline each of the choices here. Figures 6-2 through 6-4 show representations of each.
- Raspberry Pi 2 Model B: Second-generation board with a faster processor and 1Gb
RAM but retains the layout of the Model B. - Raspberry Pi 1 Model B+: New generation board with more GPIO pins, more USB
ports (four), and a micro SD card slot. It also requires a bit less power than older
boards. - Raspberry Pi Model A+: Same new features of the Model B but cheaper with fewer
USB ports, no Ethernet, and a slightly smaller footprint. - Compute Module Development Kit: Incorporates a new, smaller edge-mounted
Raspberry Pi module and expanded GPIO pins (120 instead of 40). It is designed for
industrial applications.
■Note at the time of this writing, the raspberry pi Zero was released. it has the same processor and
memory as the original raspberry pi but lacks the ethernet and auxiliary video ports. this was done to keep the
cost to an amazingly low $5.00 and a form factor down to the size of a pack of chewing gum.
Figure 6-2. Raspberry Pi 2 Model B and Pi 1 Model B+ (courtesy of Raspberrypi.org)