Semi-permanent Vive Lighthouse mounts

I wanted to mount my lighthouses up high, without drilling any holes as I would soon be moving this to another room in the house. It was the ~$10 at Home Depot for the parts below1605

Materials: (for 2 poles)

(Note: I used 1/2″ conduit and as a result had to snip the power plug, but if you use 3/4″ conduit with larger rubber caps, nuts and bolts, you should be able to avoid that.)

2x 1/2″ EMT conduit x 10′
4x 1/2″ EMT conduit strap
2x Wood plate (2 1/2″ x 4 x 1/2″)
2x 5/8″ Rubber leg tips
2x 3/4″ Rubber leg tips
4x 3/8-16 Nut
2x 3/8-16 Bolt
12x 1/2″ wood screws
~10″ 3/32″ Nylon edging (optional)

Picture for one pole:1533


Drill bit (3/8″)
Fish tape
Zip ties
Metal files (round and flat)

Build It

Start by cutting the conduit about an inch short of you ceiling height. Then mark a point 3 1/4″ from each end.

Drill a 3/4″ long opening in the conduit at each end, centered on the point you marked, taking care to make sure both holes are in same orientation.

File and smooth the opening, since you’ll be pulling the power cord through.

Attach some tape to the end of the fish tape, feed that into one drilled hole and out the other.

I used some snips to clip off the back side of the power plug to a 45ish* angle, to allow it to fit in the 1/2″ conduit.

Use zip ties to help pull the power cord through the conduit.

Cap the top side with a rubber cap. Then thread two nuts onto the bolt, and put the other rubber boot over the bolt’s head.

Place the top end of the conduit against the wall, and use a hammer to sink the nuts into the conduit.

Attach the wooden plate to the top end of the conduit with the straps. Then attach the lighthouse mount to the wooden plate.

Place the conduit into it’s position, and thread the nut out until its nice and tensioned. I found flexing the conduit would allow me to back the bolt out a little more and create a tighter fit.1605

SmartKegerator v2 Installation Guide

This project has been heavily modified to take advantage of the raspberry pi 2’s additional horsepower. If you are looking for the raspberry pi v1 code, look around version 62 in the repository. Version 70 and on are unlikely to work on the original pi, although I have not tried.

[Updated 10/4/2016: These instructions have been updated and now work with a clean raspbianPIXEL image]


Install a new copy of raspbian onto an sd card.

On your first boot, configure these:
Expand Filesystem
Boot to Desktop
Enable Camera
Configure keyboard (if not in UK) and timezone
Finish > Reboot

1) Update raspbian

sudo apt-get update
sudo apt-get upgrade
sudo rpi-update

2) Install requisites

sudo apt-get install qtcreator cmake libopencv-dev mplayer subversion qt4-dev-tools libqt4-dev libqt4-dev-bin qt4-qmake

3) Configure QtCreator

Launch QtCreator from start menu > Programming > QT Creator

Once in QT Creator:
Tools > Options > Build & Run > Qt Versions > Add > navigate to or paste: /usr/bin/qmake-qt4
Tools > Options > Build & Run > Compilers > Add > pick GCC
Then set compiler path : /usr/bin/arm-linux-gnueabihf-gcc-4.9
Click OK

Qt Creator seems to think that we are going to deploy on a remote target, to fix this :
Help > About Plugins
Uncheck Device Support > Remote Linux
Click Close and reopen Qt Creator

Tools > Options > Build & Run > Kits > Desktop-Qt4 4.8.6 (qt4)
Compiler: GCC
Debugger : /usr/bin/gdb

4) Compile facial recognition libraries

cd ~
git clone
cd libfacerec
sudo cmake .
sudo make

5) Compile QWT

cd ~
mkdir qwt
cd qwt
svn co svn:// ./
sudo make
sudo make install
cd lib/
sudo cp * /usr/lib/

6) Compile WiringPi

cd ~
git clone git://
cd wiringPi/

7) Get SmartKegerator source

cd ~
mkdir qt
cd qt/
mkdir SmartKegerator
cd SmartKegerator/
svn co ./

8) Edit config files

sudo nano ~/qt/SmartKegerator/config.txt

Make sure all of the paths are correct for your system. If you’re using a fresh copy of raspbian and followed each step here, you shouldn’t need to edit anything.

9) Run it!

Open QTCreator and File > Open Project > /home/pi/qt/SmartKegerator/

Click Yes when it asks about environment settings.

Click the green arrow on the bottom-left to start building. The first build will take a while. If everything worked you should see the application open! If you get errors, try google or come back here and post a comment.

9) Disable the screen saver

sudo nano /etc/lightdm/lightdm.conf

scroll down until you see


Remove the starting ‘#’ from ‘#xserver-command=X” and add ” -s 0 -dpms” to the end so you have:

xserver-command=X -s 0 -dpms

ctrl-x, y, enter to save

To use the Mimo-720S

See this post about configuring the touchscreen and kernel

Slic3r to Davnici XYZWare conversion

Converting gcode files generated with slic3r to work with the davinci printer’s native software XYZWare was a little tedious, so I wrote a simple C# app to automate the process. For this app to work you must be using a modified slic3r ini file

Just drag your gcode file onto the app and it will pop out a file of the same name but with a .3w extension, overwriting any conflict.

C# Source code is here if you’d like to compile it yourself as a new console app. You shouldn’t need to make any modifications, but you’re also welcome to.

EXE download for those who can’t compile themselves.

Hope this helps someone!

BMW F3x/F8x Escort radar detector hardwire with OEM mute button and HUD notification

I wanted to hardwire my radar detector, but I wanted a mute button and alert led, something improved upon my last idea.

I decided to use one of the disabled buttons on the BMW F3x/F8x’s headlight module for the mute button. I create my own button contacts using copper tape to put over the top of the original module’s contacts. I also 3D printed an alert symbol that flashes in my HUD, but this is only noticeable at night, currently.

I’ve included links to the materials I used, but there are many cheaper alternatives if you shop around!

Stuff needed:
Radar detector
Hardwire kit (Amazon – $26 or make your own)
soldering equipment
small drill bit + drill

for mute button:
kapton tape (Amazon – $9)
copper tape (Amazon – $6)
2-pin connector + wire (Amazon 10pack – $6)

for hud notification:
HUD notification housing (Thingiverse)
Notication led (any 5mm led, here’s what I used)
Small piece of paper
2-pin connector + wire (Amazon 10pack – $6)


Hardwire kit modifications: (only if you’re doing a mute button or remote led)
Remove the existing led and mutton button from the circuit board. Use a small drill bit to drill new holes for each lead, and connect a wire and connector to each spot.

I also found that when using the red led hardwire kit, I had to add a resistor once I removed the signal led. The blue led hardwire kit already had this resistor oddly enough.

Remote notification symbol:

1) Print the housing. I used 0.3mm thickness and 20% infill.

2) Place the led of choice into the back plate, bend the leads appropriately to fit, and solder a thin wire onto the leads.

3) Cut a small piece of paper to fit inside the housing, covering the whole left by the alert symbol, This will help diffuse the light, as well as hold the symbol in place.

4) Using some glue (I used 3 dots of superglue) place the symbol on the paper, using tweezers to perfectly align the symbol with even borders all around.

Hud Symbol

5) Snap the cover onto the back plate and use some sticky back tape to affix to the hud. You’ll need to do some testing to position it right.

Mute button instructions:

1) Follow this guide to remove the tabs blocking the OEM button from depressing:
(Pro-tip, when removing the module, press down on the top of the clips from inside, until it’s about 3/4″ out. Then you should just barely be able to see the clip from the outside. Push down from the outside on the part of the clip you can see and it will come out nice and easy)

2) Next, we’ll make our own button contacts so the radar detector can tell you’ve pushed the button. Start by removing the black silicone/rubber. (Watch out for the clear grease over the radial contacts in the center of the board. Try not to touch it!):

3) Lay kapton tape over the existing contacts. I chose the top button, and to put a contact on both sides, but really one side should be fine.

4) Lay 2 strips of copper tape per contact, using the existing contact as a guide. You want the two strips really close so they’ll join when the button depresses, but not touching!

5) Solder your wire onto the copper strips. If you do both sides, make sure it’s wired so that either side closing would complete the circuit

6) Push the silicone back over our solder job. I found using some jumper wire worked well if I wiggled and rotated it while gently pushing inside each of the 4 nubs as seen below

1) Take down the panels from the driver and passenger sides by removing the 4 bolts on each side and gently tugging down.
2) Find the cigarette lighter plug on the passenger side and install the taps.

3) I used some heavy gauge wire to feed the power and ground wires from the drivers side to the passenger side through the spot the arrow is pointing at, with the cigarette lighter plug circled.

4) On the driver’s side, run the hardwire module up behind the headlight mode switch (that you modified if you did the mute button) like so (terrible drawing, I know):

5) Pop out the panel on the left of the dash, and pull down the rubber door seal from the frame.
6) Run the cable through the open panel and up to the spot where you mount your detector. Start with the plug where it should be and start tucking the cable into the trim as you go, working back down the a-pillar. To be even safer, you can run the cable behind the airbag by removing the trim pieces altogether.
7) Reinstall the rubber trim, panel on the left of the dash, connect your optional mute button and/or remote led, put the vent back in and you’re done!

Drive safe!


Recently browsing hack-a-day I came across Michal Janyst’s project where he used an arduino with some cheap (~$3) led matrix displays to animate eyeballs on a jack-o-lantern.

I really liked the idea and decided I wanted to try and drive the pupils using motion detection from the raspberry pi camera module! Unfortunately I only had a day to work on it, and I’ve never done motion detection before, so the learning began!

Today is Halloween and the effective deadline for the project, and while I’m not happy with the framerate I’m getting in python, I’m quite happy with what I was able to do!

I want to move the python to c++ for next year, which should triple the framerate or so.

Items used:

Cheap plastic pumpkin – Target – $3

2x MAX7219 LED matrix boards – eBay – $2.18
(I actually ordered mine from Amazon – $6.58 to make use of prime shipping)

Longer pi camera cable – Ebay $9-$27

Raspberry pi + camera



Coming soon!

Smart Kegerator

Discovery Channel Canada’s “Daily Planet” segment: (very similar to the walkthrough above)

Update 7/31/2015:

New installation guide has been posted here:


The purpose of this project was to allow my roommates and friends to be able to drink as much beer from the kegerator as they’d like, without guesstimating who owes what when it comes time to refill the kegs. The system uses two flow meters in the beer lines to detect when beer is poured, and once a pour has started, the raspi camera module turns on to run facial recognition (disabled when I shot this video) and charge the appropriate user for their beer. I wanted the system to be as passive as possible, requiring zero human interaction (no RFID cards, no selecting the user every time) but to record all pours and how much was poured. So far the system is running great, minus that accidental spill because my tap handles are too close together 🙂

Eventually I’d like to use weight sensors under each keg to get a better estimation of keg volume, and use a liquid probe thermometer to better estimate the temperature of the beer instead of the air. I’m also moving to a NOIR pi camera module after finding it had much better low light performance, and I’ll probably add some IR lamps to help illuminate the face for recognition when the lights are off. I also need to mount the camera a bit better, ideally higher and a littler further behind the tower, but the flex arm tripod worked great for this first implementation.

I’m also working on a new UI that will probably look something like this:

Mock up UI v2

Mock up UI v2

The source is currently avilable at but it’s certainly not finished or polished.

The UI is written in QT and C++, using python scripts for the gpio flow interrupts (the c++ interrupts seemed unreliable,but python’s implementation worked perfectly) and the C loldht script found on these forums to read the temp from the temp/humidity sensor.

I’ve made a quick and dirty fritzing image to illustrate the connections, but I’m not very good with frizing so I’ve included text as well.
On each flow meter, I connected the red to the pi’s 3.3v, black to ground, and the yellow pin to GPIO #23 and GPIO #24 for left and right sides respectively.
The temperature sensor, looking at the front of it (the side with the holes) the pins go left to right 1-4. Pin 1 to GPIO #17, so that I can turn it on/off by writing power out on pin 17. Pin 2 to GPIO #4. Pin 3 to ground. And lastly put a 4.7k ohm resistor between pins 1 and 2.

Rasperry pi

Mimo 720S display

Powered USB Hub

DHT22 temp/humidity sensor

Flow meters

Pi Camera module (NOIR seems ideal for low light)

100cm SPI cable (raspi camera cable)

Camera housing

Wide-angle lens

Techflex cable sleeve(I think it makes the raspi camera cable better looking)

For the gpio breakout:
10 pin ribbon cable

10 pin connectors

protoboard from radioshack

Mimo 720S solution –
Raspberry pi camera to opencv/facial recognition –

More info coming soon!

Pandora controlling Google chrome plugin

I recently moved away from the OCR method of reading data from pandora, and moved to a google chrome plugin. This has the downside of requiring chrome to be running, but it allows infinitely more control.

I’ll do a better writeup soon, but following files make up the plugin: