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8 new English articles, SUMMARY.md updated

docs/en/raspberry.md

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+Raspberry Pi
+============
+
+**Raspberry Pi** is a single-board computer that fits in the palm, created on the basis of mobile microprocessor ARM11. It features low energy consumption, and it can even run on solar panels. Raspberry Pi 3 is included in the kits for programmable quadcopters "Clever 2" and "Clever 3".
+
+<img src="../assets/raspberry3.jpg" width="500">
+
+* Weight is 45 grams.
+* Clock rate is 1.2 GHz.
+* Graphics core in the Broadcom BCM2837 processor.
+* RAM is 1 GB.
+* Four USB 2.0 ports.
+* An HDMI port.
+
+The scope of Raspberry Pi computer application is quite wide, since after all it is quite a full-fledged computer. If you need a machine to solve simple problems that do not require too many resources in terms of calculations, you can safely connect your Raspberry Pi device to the standard PC elements: a monitor, a mouse, or a keyboard.
+
+The Raspberry Pi is a very popular platform where you can implement a variety of projects, such as:
+
+* a home automation server (or a "smart house" system);
+* a data storage server (NAS);
+* a home media server;
+* a "think-tank" for automated machines or robots.
+
+In fact, we will use it as the last in the list, due to its ability to connect to the Pixhawk autopilot.
+
+See more:
+
+* [RPi image](microsd_images.md)
+* [SSH access](ssh.md)
+* [Network setup](network.md)