Online Python Tutor - Visualize program execution.
OverAPI.com | Collecting all the cheat sheets. Learn Python The Hard Way, 2nd Edition — Learn Python The Hard Way, 2nd Edition. Esp0/googleAuthNet. Vim. Webdesign. Algorithm Tutorials. Algorithms. D3.js - Data-Driven Documents. C# Uml. Online school. Free source code hosting for Git and Mercurial by Bitbucket. The DIY Kid-tracking Drone. On school-day mornings, I walk my grade-school-age son 400 meters down the hill to the bus stop. Last winter, I fantasized about sitting at my computer while a camera-equipped drone followed him overhead. So this year, I set out to build one. For the basic airframe, I selected a quadcopter design for its maneuverability and ability to hover.
Construction was straightforward: You can buy a quadcopter kit with all the pieces or, as I did, get parts separately and spend more time on system integration. On the mechanical side, there’s a central frame to hold the electronics, spars of aluminum to support the motors and propellers, and legs to cushion the quadcopter’s landing (I made a few extra sets of legs out of foam board for easy replacement). For the main control board, I chose an ArduPilot Mega, mostly because it integrates everything I needed—the CPU, input/output ports, a three-axis gyroscope and accelerometer, and a barometric altitude sensor. So, did it work?