Embedded Computing/Microcontrollers
Adafruit
http://learn.adafruit.com/
Arduino
https://www.arduino.cc/en/Guide/HomePage
Instructables
http://www.instructables.com/
ITP Physical Computing
http://itp.nyu.edu/physcomp/
Let's Start Coding.com
http://www.letsstartcoding.com/all-base-kit-projects
Makey-Makey Keyboard Interface
http://makeymakey.com/guides/
Maker Education-Tools and Materials
http://makered.org/resources/tools-materials/
Machine Science Tutorials
http://guides.machinescience.org/course/view.php?id=29
Project Ignite
https://projectignite.autodesk.com/
Raspberry Pi-Physical Computing with Scratch
https://www.raspberrypi.org/learning/physical-computing-with-scratch/
Scratch-X Extensions- Arduino 101, Leap Motion, and More
http://scratchx.org/#extensions
SpoLearning Labs( Liz Arum)-3D Printing Resources
http://spolearninglab.com/curriculum/lessonPlans/index.html
Sparkfun
https://learn.sparkfun.com/resources
Technology Will Save Us
https://www.techwillsaveus.com/resources/