Learn how to control the speed of DC motor using Rasberry pi 2 board. There are 40 GPIO output pins in Raspberry Pi 2. But out of 40, only 26 GPIO pins (GPIO2 to GPIO27) can be programmed. Some of these pins perform some special functions. With special GPIO put aside, we have 17 GPIO remaining.

We've seen a lot of DIY home automation projects over the years, but Instructables user electronichamsters shows off one of the most complete systems we've seen yet. With it, you'll be able to monitor just about everything in your house.

First we'll setup the Raspberry Pi, to do this you'll need to have Raspbian installed. You can buy a Pi with Raspbian pre-installed or you can use a 2GB or larger SD card that you already have.

The Chatter Telephone is a classic Fisher Price toy that has been sold since 1962. The design has evolved over the years, but in 2010 the original ‘classic’ Chatter phone was brought back into the limelight in the Disney / Pixar film Toy Story 3 where the phone helped Woody escape from Sunnyside Daycare.

Once I realized a Raspberry Pi would fit perfectly inside one, I decided the obvious use for it was preserving digital content. Having run BitTorrent Sync on a Raspberry Pi before, I knew it would be a stable platform to provide a synced backup of media from my MacBook and phone, and my wife’s MacBook and phone.