Two years ago, before Lockitron and all of its competitors arrived, I went to college. During college, I created many prototypes of an electronic door lock that I detail below.
Lights are a necessity if you are going to be on the road at night. This applies to anything that moves–car, bike or pedestrian. I will document how I compared designs and settled on assembling a design based on Revolights for about $40/wheel. I call them SparkleLights.
In this video, I provide a complete tutorial on how to assemble your own stair lighting, featuring block diagram, code overview, testing and final layout. Code and schematic can be found on this page.
In this video, I show how I solved my hourly hydration problem by wiring a transistor to a water pump behind my desk. I describe three different ways of switching: MOSFETs, BJTs and relays. I then skim over logic gates and show how I added lighting to my bedroom.
Music from http://goo.gl/NblLp
I made a point-of-sales system using Arduino, a receipt printer, a 20×4 LCD and a keyboard on October 13, 2012. I thought it would be a good exercise for me because I really wanted a reason to use the Adafruit receipt printer and I would have an example of an embedded systems project that was complicated enough to require a state machine. I’ve documented all the hardware and software below.