[Lab] The Big Plan - Chris B

Fri Mar 22 09:03:19 EDT 2013

I second the raspberry pi as a projector controller! Its cheap, projectors
are bright (and can be borrowed!), and I don't think the code would be that
hard. You will have to use some external controller with the Pi if the
sensor is analog as the pi has only digital io. I could try out some simple
code tonight to see if the video part is possible without getting into
opengl code :)
Cheers!
Kirk
On Mar 21, 2013 9:21 PM, "Henri Kuschkowitz" <henri.kuschkowitz at gmail.com>
wrote:

> Hey Chris,
>
> I know you already received tons of ideas, but i was thinking about a mini
> fan put somewhere between parts of the tube (maybe after the bacteria
> filter) and you then just measure the speed of it to determine the power
> for your lights?
>
> For the question regarding lights, there are hundreds of controllable led
> strips out there that could suit your needs. or maybe EL solutions (though
> it would cost you more i think) like this:
> https://www.sparkfun.com/products/10800
>
> Also, you can dim a projector simply by projecting grey scale images…
> which means a raspberry pi connected to the sensor could be a neat solution.
>
> Just my 2 cents.
>
>
> Cheers and good luck,
> Henri
>
> On 2013-03-21, at 5:46 PM, The Big Plan - Chris B wrote:
>
>
> Hi Modlabbers,
>
> Thanks for all the interest in my art installation!
>
> So far it looks like the pressure sensor idea is the one I'm leaning
> towards. Having a microphone detect the ventilator breaths sounds more
> finicky to me.
>
> Still trying to figure out how to back light the canvas. Would a projector
> work instead of using LED lighting? Can a projector
> be connected to the pressure sensor set up to do the variable dimming?
>
> Club SAW has 3 projectors available:
>
> Panasonic PTAX200U HD Video Projector
> 16mm Projector
> 35mm Projector
>
> As for a timeline / schedule. If I could do this in May / June that would
> be great but it may be more realistic to wait until September.
>
> Here's a photo of the painting below. It's about 7 by 11 feet:
>
> Thanks,
> Chris
>
> <2012-11-12 14.51.55.jpg>
>
>
>
>
>
> On 15-Mar-13, at 8:41 AM, Michael Sepa wrote:
>
> Chris,
>
>
> The clarification of the project really helps out.  I looked up the manual
> for the Puritan Bennet LP10 (
> http://www.meql.com/Manuals/Puritan-Bennett-LP6-Plus-and-10-Ops-Manual.pdf)
> in the hope that there would be a simple electronic monitor connector on
> the back that you could hook into, but no such luck.  There are pressure
> alarms that can be set and a remote alarm connection on the back of the
> machine, but you'll get audible alarms off the machine at the same time.
>  Not what you intend.
>
>
> One approach would be to do the following:
>
>
> 1. Lights start off, no ventilator pressure
>
> 2. Ventilator turns on, a microphone beside the patient air tube senses
> flow
>
> 3. Arduino detects change from microphone
>
> 4. Arudino uses pulse width modulation[2] to brighten an LED array from
> off to full on in 1.5s, and holds
>
> 5. Ventilator turns off
>
> 6. Microphone detects stop of flow from patient air tube
>
> 7. Arduino uses pulse width modulation to dim an LED array from current
> level to off in 1.5s and holds
>
>
> [1] pulse width modulation is just a fancy way to say turn on/off the LED
> array fast enough to control brightness.  This is built into the Arduino
> system, so it's very easy.
>
>
> Connecting to and dimming an LED array with an Arduino is well understood.
>  No issues there.
>
>
> The microphone will require an amp chip to get it producing a signal the
> Arduino can easily read.  If we can find a pre-made microphone and amp,
> then it will be all so much easier.
>
>
> The programming of the system would be straight forward.  Certainly less
> than a day of effort.
>
>
> The system would work well if the room was reasonably quiet.  If there was
> other noise it might trigger the microphone causing premature light
> adjustment.  A better approach would be to use a pressure sensor.  I
> checked ebay and see several pressure sensors available, all use I2C
> interfaces.  That would take a bit more programming effort, but certainly
> less than a day or two.
>
>
> If you go with a pressure sensor, we'd need to makes sure the sensor has
> the right range to sense the ventilator pressure.  That I couldn't get from
> the quick ebay search because they don't usually publish specs with sale
> items.  I'm confident  we could find an appropriate one on ebay, spark fun,
> or somewhere else.
>
>
> As for your budget, I'd think you should have no issues buying all the
> tech plus paying someone a small honorarium for helping you program it all.
>
>
> My big question would be what's your schedule?
>
>
> -Michael Sepa
>
>
>
> Date: Thu, 14 Mar 2013 17:49:08 -0400
> From: The Big Plan - Chris B <tbp at ghostwise.com>
> To: lab at artengine.ca
> Subject: Re: [Lab] Controlling Light with Sound
> Message-ID: <F3148EB9-8831-464E-92AA-2144AB15E72B at ghostwise.com>
> Content-Type: text/plain; charset=US-ASCII; format=flowed; delsp=yes
>
> Hi everyone,
> Thanks for the awesome replies so far. I think I should clarify my
> intentions:
> My plan is to suspend a loose canvas that is approximately 7 by 11
> feet on an angle from the ceiling.
> I would like to put lighting behind it (I don't know what lighting to
> use or whether it
> should be a set of lights). The rest of the room will be dark.
> A ventilator (Puritan Bennett LP10) will be on the floor. Every breath
> of the ventilator
> should cause the lights to turn on in a gradual way and then dim dark
> as the breath
> ends. Each breath should take about 1.2-1.5 seconds.
> I like the idea of an Arduino or Raspberry Pi controlling the lighting.
> It sounds like I will also need a mic by the ventilator.
> Finally, I have zero programming experience or overall technical
> experience to do this. I'm the artist
> with a vision. I would appreciate assistance from anyone interested in
> this project.
> It would be great if it could be done on a $250-500 budget.
> Thanks in advance,
> Chris
> On 14-Mar-13, at 4:11 PM, The Big Plan - Chris B wrote:
>
>
> Hi!
>
>
> Looking for some advice for an art installation. I'd like to have a
>
> light or set of lights respond to an auditory
>
> input. I'd like the lights to turn on in time with the sound of a
>
> ventilator (a medical one). So when the ventilator is
>
> not doing a breath, the lights would be off, but then when the
>
> ventilator starts doing a breath they would
>
> turn on for the duration of the breath. I'd like the lights to light
>
> up and dim gradually, not just on an off.
>
>
> What's a simple or best way to do this?
>
>
> Thanks!
>
>
> Chris
>
>
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