Amazon, apparently more interested in exposing you to its Alexa Voice Service than getting you to fork over $180 for its Echo voice assistant, has published detailed instructions on building your own version of Echo using a $35 Raspberry Pi 2 single-board computer.Four mindblowing Ted Talks for techiesTED talks make that possible to do in a single sitting. Here are four talks that in just over an hourREAD NOWThe Echo Pi instructions, published on Github, walk the coding-and shell-savvy through the steps required to create this DIY project (you’ll need a free Amazon Developer Account). And while Amazon might forego an Echo sale, it does encourage you to snap up other components needed to supplement your Raspberry Pi Model B — USB 2.20 Mini Microphone, Wi-Fi Wireless Adapter, etc. — via your handy dandy Amazon account.The project involves using a Java client running on Raspberry Pi and a Node.js server. Raspberry Pi is a very flexible platform that supports a host of open source and other OSes, and has spawned Raspberry Pi projects ranging from cameras to supercomputers.