PI2-EX
Second-generation of Raspberry Pi. It replaced the Raspberry Pi Model B in February 2015.
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Specs:
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A 900MHz quad-core ARM Cortex-A7 CPU;
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1GB RAM;
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4 USB 2 ports;
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40-pin extended GPIO;
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Full HDMI port;
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Ethernet port;
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Combined 3.5mm audio jack and composite video;
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Camera interface (CSI);
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Display interface (DSI);
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Micro SD card slot;
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VideoCore IV 3D graphics core.
The Raspberry Pi 3 is the third-generation Raspberry Pi. It replaced the Raspberry Pi 2 Model B in February 2016.
Specs:
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Quad Core 1.2GHz Broadcom BCM2837 64bit CPU;
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1GB RAM;
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BCM43438 wireless LAN; and Bluetooth Low Energy (BLE) on board;
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4 USB 2 ports;
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40-pin extended GPIO;
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4 Pole stereo output and composite video port;
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Full size HDMI;
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CSI camera port for connecting a Raspberry Pi camera;
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DSI display port for connecting a Raspberry Pi touchscreen display;
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Micro SD port for loading your operating system and storing data;
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Upgraded switched Micro USB power source up to 2.5A;
Raspberry Pi 2
Raspberry Pi 3
Raspberry Pi GPIO pins
Even though the expansion board will be compatible with both Raspberry Pi 2 & 3, we'll be using the 2nd version to conduct all the test. The 40 GPIO pins are defined as follow.
The Raspberry Pi interface
Raspberry Pi is a series of credit card-sized single-board computers developed in the United Kingdom by the Raspberry Pi Foundation. It's a capable little computer which can be used in electronics projects, and for many of the things that a desktop PC does like spreadsheets, word processing, browsing the internet, and playing games. It also plays high-definition video.
There are several versions of the Raspberry Pi. The first one was released in February 2012. This project will focus on 2nd and 3rd versions as shown in the pictures below.