@zdanivsky is a rock climber, wheeler, foodie and coder for hire in vancouver canada. you can find him on the sea wall or in his brad cave.
Latest entries
$100 light bulbs

$100 light bulbs

Philips has a new led lightbulb coming soon for $12, but of course it doesn’t have wifi or bluetooth radios for that price. cheap and hackable led bulbs are being done on kick starter too (but also without a radio). this is because just the wifi radio costs $15 dollars. but.. is a sweet rgb...
home automation

home automation

this has been a very messy few weeks, months even, but finally I have the perfect home-theater/workout-out .. living room. i can do my pulls and watch movies through the rainy months in great comfort (and no excuses not to exercise daily). great effort was required to get this false ceiling in place, but it...
drobo fail

drobo fail

I own two drobos — they cause me great pain. Why buy two of them then? Well, drobo won the american business awards for best product, and many more. The problem is that it’s simply underpowered hardware and that the hard drives can’t be mounted by any other system. Now I can say a few...
motorized bed repair

motorized bed repair

So, things break and need repairs. My Dad has always said.. “don’t repair, fit the spare”, but this part hasn’t been available a long time. I looked, made calls, sent emails, got calls back.. but no luck. The board is simple, just a few AC Power relays, but it is the controller for bed and...
pan and tilt arduino

pan and tilt arduino

here is an arduino sketch (below) to control a pan and tilt system from your keyboard. I chose high torque servos hoping they would be a bit smoother and less “buzzy” when tracking into new positions. with the lightweight gopro camera there is still some jittering, but nothing that can’t be removed with a good...
workouts at home

workouts at home

Winter has been pretty kind with sunshine thus far, but the rain is coming. Days where I can’t wheel on the seawall, I do more “pulls.” Getting ready for climbing the chief climbs I spent hours on this simulator at home. (see notes on performance boosting) After many versions, I’ve come up with the ideal...
testing brakes (video)

testing brakes (video)

Here is a short video of us testing the elevation wheelchair with the disk brakes we designed. This project has been both frustrating and rewarding. The tiny details add up quickly. The disk brakes require a bit of extra chair width, and this can be deal breaker for most users. It can make getting into...
data acquisition on arduino

data acquisition on arduino

Arduinos can be used in “real products”, they just aren’t teaching tools. I cut my teeth on 68HC11 using C and the BUFFALO bootloader.. all pain and not much fun. I am sure I’d get better, faster and more productive with the paid tools and IDE’s for this chip if using it for a job,...
networking with java

networking with java

Over the years I’ve written about Linux and Operating Systems, but I think those labs/articles are too dated to offer here (better how to’s exist, I don’t mind saying). I wrote these labs (below) for Labs for a networking course at Langara College not long ago. They are a good way to get going using...
better scrollbars for disability

better scrollbars for disability

For people with poor hand function the gesture recognition on most laptops is impossible to use. I have to turn the two, three finger and swipe commands off all together. This makes scrolling a pain, and double sets of scrolling windows as seen in this example image where I’m using WordPress on a small screen....
oculus prime

oculus prime

Colin has spent many, many hours learning everything about charging a lithium polymer battery via an arduino and has finally got a few test PCB’s made. Many melted chips and smoke has paid off and hopefully there will be no more time looking at bread boards like this (right). The amount of detail involved in...
wheelchair disk brakes

wheelchair disk brakes

A long standing project, and a big part of the open PAW concept, is controlling braking with software (on board arduino or android). As a quadriplegic I don’t want to take my hands off the wheels to apply the brakes because this throws off my balance (especially on uneven ground or with muscle spasms to...