The elevator at [Alex]’s office building has some quirks which make it very inconvenient to everyone in the building. The major problem was that the doors of the elevator at each floor stay locked until someone walks down the hall to hit a button. Obviously this was a hassle, so [Alex] built a controller that can remotely call and unlock the elevator. (Part 2 of the project is located on a separate page.)
The first step was to source the hardware and figure out exactly how the controls for the elevator worked. [Alex] decided to use an Electric Imp for this project, and after getting it connected to the Internet, he realized that he could power it directly off of the elevator’s 10V supply. From there, he used relays to interface the Electric Imp with the “elevator call” and “elevator unlock” buttons inside the elevator’s control panel.
Once the hardware side was completed, it was time to move on to the software side. [Alex] wrote a mobile app for a user interface that can be accessed from anywhere, and also wrote the code for the Electric Imp agent and the code that runs on the Electric Imp itself. Now, a simple tap of a button on a mobile device is enough to call the elevator or unlock it, rather than in the past where someone had to run down a hall to hit the button.
We hope there is some security on the mobile app, otherwise anyone in the world will be able to call the elevator and turn it into a passenger-less useless machine!
[Niklas Roy] calls it his Perpetual Energy Wasting Machine, but we know it for what it truly is: a building-sized most useless machine. You’ll remember that a most useless machine is a bobble that uses clever design to turn itself off once you have turned it on. This does the same thing with the elevator of the WRO Art Center in Wroclaw, Poland. The one difference is that it continually turns itself on and off.
He rigged up a pulley system that travels through the stairwell of the building. Whenever the elevator door on the top floor opens it causes the call button on the bottom floor to be pressed. The same thing happens when the elevator reaches the ground floor. But he didn’t stop there. Since the device is just wasting electricity whenever the elevator moves without passengers in it, he added a meter to track the loss. It’s the guts of a printing calculator strapped to the inside of the car. Every time the doors open it adds to the total.
You can see the installation in the video clip after the jump.
Continue reading “Most useless machine: building elevator edition”
[Ben Peoples] works in theatrical electronics. Sounds like fun, and here’s an example of the kind of stuff he does. We’re not sure what event this installation was used for, but if the elevator ride needed something flashy just think of what the party room must have looked like. These HDTV screens on the ceiling of the elevator play different clips when the elevator is moving up or down. The challenge for [Ben] was to find a way to make it work without tapping into the elevator electronics or requiring any button presses.
The first attempt at sensing the elevator’s travel was done with an accelerometer. The problem with this approach is that an accelerometer only senses change in acceleration and this method proved to be fairly error prone. [Ben] switched over to a reflective sensor which performed quite well. Since most of these sensors will only work within about an eighth of an inch he ended up building his own with a LDR and a couple of amber LEDs.
[Michael Ruppe] was working one day when a man named [Kevin] approached him for a bit of help with a project. It just so happened that [Kevin] was in the middle of constructing a DIY residential elevator and he needed assistance putting a control board together.
[Kevin] had no problem casting a forklift ram into his basement slab, nor installing a submersible pump in a custom-made hydraulic pit, but wiring up the controls for the device was just not something he was comfortable with. [Michael] was more than happy to lend a hand, and over the next couple of months the pair got things running nicely.
Instead of relying on a microcontroller, [Michael] built a control board that uses little more than a handful of relays and microswitches to get the job done – It’s certainly not hard to appreciate the controller’s simplicity.
It’s stories like these that remind us just how much the hacker community is willing to help out complete strangers with any task, big or small – you guys rock!
Stick around to see a short demo video [Michael] shot, showing the elevator in action.
Continue reading “Build an elevator controller, gain a friend for life”