I was inspired by Phil Burgess’ great electronic mask project and knew I had to build one of my own.  The project is detailed in a combination of Adafruit tutorials on Animating Multiple LED Backpacks and the Wave Shield Voice Changer.  I thought I’d relate my experiences in building and using the mask.  Overall, it was a lot of fun.  I accompanied my daughter to a few houses on Halloween night — visibility wasn’t so good at [...]

In my last post, I explored alarm monitoring using the Raspberry Pi and Arduino.  I thought I’d give the Electric Imp a try as well.  The Electric Imp is a WiFi module and Cortex-M3 processor built into an SD card form factor and available on Sparkfun for $30.  It needs a few extra bits like an ID chip to function but I picked up an Electric Imp Shield on Sparkfun to make it easy.  To configure [...]

I spotted a post by Lior Hass on Hackaday a little while back where he described his Alarmino project where his alarm system now connects with an Arduino and a custom board to simulate the phone line and interpret Contact-ID protocol.  He could then get the system to SMS him in the case of an alarm.  In his case, he did this in lieu of using a central monitoring service and it only reported events that would [...]

I was reading the April 2012 issue of Elektor and spotted an article by Ludovic Mézière on building a Thermometer using Giant Gottlieb® Displays.  I was really intrigued by his use of large mechanical scoring reels from a 1960s pinball machine.  So I set out to investigate how costly it might be to obtain such reels.  Once I learned that the technical term for these were “score reels” it became somewhat easier to search eBay [...]

I was playing a game of Connect4 with my daughter one day and it occurred to me there might be a nice way of sensing the moves in the physical game in order to introduce a computer player. Looking at the top of the game board, I thought there just might be enough room to place photo interrupters in each position to watch as the pieces are dropped. It turns out the GP1A57HRJ00F sold at [...]

I happen to have some old 12 inch optical disks made of glass. So when I saw Terry and Adam Clarkson’s ClockOS project on Kickstarter, I recognized the potential for an awesome clock! The ClockOS board is Arduino compatible and hosts a ring of 180 surface mount RGB LEDs (in 3 concentric rings of 60).  Modes can be set through 3 buttons on the back side of the board.  The onboard Atmel168 can be programmed [...]

I first saw Pololu’s 3pi robot in action at MakerFaire 2009.  It was an impressive and agile line follower with a well-designed compact body.  I brought one home and came to realize that it was even quicker than I’d seen at the show. I took some poster board and electrical tape and laid out a maze pattern.  The video below shows the 3pi learning the maze (code available on the pololu site). The second video [...]

I met the Macetech guys at Makerfaire 2009 in San Mateo and picked up a number of ShiftBrites.  This was my first of several multi-RGB LED projects.  I decided to array the 16 Shift Brites I had into a 4×4 matrix on a piece of 24″x24″ inch plywood (one of the sizes that comes precut at stores like Home Depot).  I evenly spaced a grid of 16 holes just big enough for the ShiftBrite LEDs [...]

The Secret Knock Gumball Machine is a project I built from the plans and instructions from Steve Hoefer’s article in Make magazine (volume 25).  Gumballs are dispensed only to those who use the secret knock on the front of the machine.  The machines uses an Arduino as the controller and a piezo sensor to detect the knock.  The machine can also learn new knocks with a single button press.  I used Oak plywoood for my [...]

After attending Adrian Crenshaw’s talk at DefCon18 (slides, video) on using the Teensy as an exploit tool, I was inspired to give it a try.  I took a Teensy and added an RGB LED, photo sensor, DIP switches, and a keyboard connector to experiment.  I had fun trying it in various ways.  Ultimately, I used the DIP switches to set which platform it targeted for the exploit (Windows, Mac, or Linux) as well as what [...]