[dorkbotpdx-blabber] exhibition announcement
Dan Gilsdorf
dan_gilsdorf at hotmail.com
Wed Apr 1 14:48:05 EDT 2009
I am involved in a small group exhibition at the Marylhurst Art Gym entitled SRO Video: Guys Doing Guy Things (the curator came up with the title). The show consists of six works by three artists and everything is video/sound installation. The information is as follows:
Reception for the Artists: 3 p.m. to 5 p.m., Sunday, April 5, 2009
Exhibition continues through May 14, 2009
Gallery talk noon, Thursday, April 23
Closed Easter Weekend (Friday – Sunday, April 10-12)
Marylhurst University
17600 Pacific Highway (Hwy 43)/ Marylhurst, OR 97036-0261 (just south of Lake Oswego)
Phone: 503.636.8141 / Toll-free: 800.634.9982
More information at
http://www.marylhurst.edu/theartgym/2009srovideo.php
Hope to see you there; if we haven't already met, come on up and introduce yourself.
Dan Gilsdorf
> From: dorkbotpdx-blabber-request at dorkbot.org
> Subject: dorkbotpdx-blabber Digest, Vol 34, Issue 1
> To: dorkbotpdx-blabber at dorkbot.org
> Date: Wed, 1 Apr 2009 05:39:44 -0400
>
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> Today's Topics:
>
> 1. solor powered Dorkboard, fact or fiction? (scott winner)
> 2. Re: solor powered Dorkboard, fact or fiction? (Laen)
> 3. Re: Re: solor powered Dorkboard, fact or fiction? (Jared Boone)
> 4. Re: Re: solor powered Dorkboard, fact or fiction?
> (Donald Delmar Davis)
> 5. Haunted Garden installation: opening this thursday
> (Simran Gleason)
> 6. Re: Re: solor powered Dorkboard, fact or fiction?
> (Paul Stoffregen)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Wed, 1 Apr 2009 01:36:31 +0000
> From: scott winner <scott at scenbot.com>
> Subject: [dorkbotpdx-blabber] solor powered Dorkboard, fact or
> fiction?
> To: <dorkbotpdx-blabber at dorkbot.org>
> Message-ID: <BAY125-W50863F448D6C73ABA8E955A88B0 at phx.gbl>
> Content-Type: text/plain; charset="iso-8859-1"
>
>
>
>
>
>
>
>
>
>
> I am looking for some advice or tips.
> Here is my project,
>
>
> I want to run my Dorkboard on solor
> power. Don is setting me up with a 3 volt chip. That will help a
> lot. I am going to model the control after the Solorbotics voltage
> trigger; solor energy is stored in caps then dumped into the
> Dorkboard when a critical voltage is reached.
>
>
> So my question for the ether is, what
> size caps? How much power needs to be stored to run the Dorkboard?
> No motor function, just to blink the light. I know how much to run
> the motors that will be on a separate circuit.
>
> Ok go nuts folks.
>
>
> _________________________________________________________________
> All-in-one security and maintenance for your PC. Get a free 90-day trial!
> http://www.windowsonecare.com/purchase/trial.aspx?sc_cid=wl_wlmail
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> ------------------------------
>
> Message: 2
> Date: Tue, 31 Mar 2009 19:33:07 -0700 (PDT)
> From: Laen <james.neal at gmail.com>
> Subject: [dorkbotpdx-blabber] Re: solor powered Dorkboard, fact or
> fiction?
> To: dorkbotpdx-blabber at dorkbot.org
> Message-ID:
> <0b07be6b-9b2d-4588-9cc1-5fbdb496bc2a at n7g2000prc.googlegroups.com>
> Content-Type: text/plain; charset=ISO-8859-1
>
> A running dorkboard on its own (not running any external components
> like LEDs) is about 20mA at 5V. I don't know what it would be at 3V.
> I think the Atmega168Vs run a bit less, but I haven't hooked them up
> to a meter.
>
> For the capacitor, I _think_ the math goes like this (someone correct
> me if I'm wrong!)
>
> Volts^2 * Farads = Joules of energy storage.
> Volts * Farads / amps = the amount of time it can put out that amount
> of amps. In practice, it'll be much lower, because the voltage will
> drop as you drain power.
>
> So:
> a 3V, 1F supercap would run a Dorkboard for:
> 3V*1F / 20 milliamps == 2.5 minutes.
>
> (By the way, google Calculator handles these conversions really well.
> Enter "3V*1F/20 milliamps" into a google search, and you'll get that
> answer.)
>
> -Laen
>
> On Mar 31, 6:36 pm, scott winner <sc... at scenbot.com> wrote:
> > I am looking for some advice or tips.
> > Here is my project,
> >
> > I want to run my Dorkboard on solor
> > power. Don is setting me up with a 3 volt chip. That will help a
> > lot. I am going to model the control after the Solorbotics voltage
> > trigger; solor energy is stored in caps then dumped into the
> > Dorkboard when a critical voltage is reached.
> >
> > So my question for the ether is, what
> > size caps? How much power needs to be stored to run the Dorkboard?
> > No motor function, just to blink the light. I know how much to run
> > the motors that will be on a separate circuit.
> >
> > Ok go nuts folks.
> >
> > _________________________________________________________________
> > All-in-one security and maintenance for your PC. Get a free 90-day trial!http://www.windowsonecare.com/purchase/trial.aspx?sc_cid=wl_wlmail
> >
> > _______________________________________________
> > dorkbotpdx-blabber mailing list
> > dorkbotpdx-blab... at dorkbot.orghttp://music.columbia.edu/mailman/listinfo/dorkbotpdx-blabber
>
>
> ------------------------------
>
> Message: 3
> Date: Tue, 31 Mar 2009 19:43:08 -0700
> From: Jared Boone <jboone at earfeast.com>
> Subject: Re: [dorkbotpdx-blabber] Re: solor powered Dorkboard, fact or
> fiction?
> To: "A discussion list for dorkbot-pdx (portland, or)"
> <dorkbotpdx-blabber at dorkbot.org>
> Message-ID: <3E7021AA-5812-4656-8CFA-2364C2A72F1D at earfeast.com>
> Content-Type: text/plain; charset=US-ASCII; format=flowed; delsp=yes
>
> The primary difference I'm aware of between the ATmega168 and the
> ATmega168V is that the "V" will operate down to 1.8V. I don't think it
> consumes any less power than the other part, at a given voltage and
> configuration. But as Laen alluded to, the lower the voltage you can
> operate at, the more juice you can squeeze out of a discharging
> supercap.
>
> I have spent a lot of time getting my Chronulator power consumption
> minimized. Since it's based on an ATmega168V, and is compatible with
> the Arduino tools, I have a lot of knowledge and code you can steal.
> Most of the tricks I employed are simply a matter of putting the chip
> to sleep when it's not doing anything, and making sure the chip never
> does anything it doesn't need to. Doing these things, I am able to
> operate a Chronulator at 1.8V and less than 200 microamps, which turns
> into 360 microwatts. Most of that goes to the meters that indicate the
> time. Take those out, and power consumption is maybe 20 microwatts on
> average.
>
> So what's your project, exactly? You have motors and an LED. What do
> the motors do, how often do they do it, and for how long? The same
> goes for the LED. And what kind of processing/computation will the
> Dorkboard be doing -- how often, and for how long? Depending on your
> answers, we could conceivably get your *average* current consumption
> down into microwatt territory too.
>
> - Jared
>
> On Mar 31, 2009, at 7:33 PM, Laen wrote:
>
> > A running dorkboard on its own (not running any external components
> > like LEDs) is about 20mA at 5V. I don't know what it would be at 3V.
> > I think the Atmega168Vs run a bit less, but I haven't hooked them up
> > to a meter.
> >
> > For the capacitor, I _think_ the math goes like this (someone correct
> > me if I'm wrong!)
> >
> > Volts^2 * Farads = Joules of energy storage.
> > Volts * Farads / amps = the amount of time it can put out that amount
> > of amps. In practice, it'll be much lower, because the voltage will
> > drop as you drain power.
> >
> > So:
> > a 3V, 1F supercap would run a Dorkboard for:
> > 3V*1F / 20 milliamps == 2.5 minutes.
> >
> > (By the way, google Calculator handles these conversions really well.
> > Enter "3V*1F/20 milliamps" into a google search, and you'll get that
> > answer.)
> >
> > -Laen
> >
> > On Mar 31, 6:36 pm, scott winner <sc... at scenbot.com> wrote:
> >> I am looking for some advice or tips.
> >> Here is my project,
> >>
> >> I want to run my Dorkboard on solor
> >> power. Don is setting me up with a 3 volt chip. That will help a
> >> lot. I am going to model the control after the Solorbotics voltage
> >> trigger; solor energy is stored in caps then dumped into the
> >> Dorkboard when a critical voltage is reached.
> >>
> >> So my question for the ether is, what
> >> size caps? How much power needs to be stored to run the Dorkboard?
> >> No motor function, just to blink the light. I know how much to run
> >> the motors that will be on a separate circuit.
> >>
> >> Ok go nuts folks.
>
>
> ------------------------------
>
> Message: 4
> Date: Tue, 31 Mar 2009 20:13:21 -0700
> From: Donald Delmar Davis <ddelmardavis at gmail.com>
> Subject: Re: [dorkbotpdx-blabber] Re: solor powered Dorkboard, fact or
> fiction?
> To: "A discussion list for dorkbot-pdx (portland, or)"
> <dorkbotpdx-blabber at dorkbot.org>
> Message-ID: <5B124CCD-DE68-460F-85AA-FE62F78A22A6 at gmail.com>
> Content-Type: text/plain; charset="us-ascii"
>
> See page 303 of the datasheet.
>
>
> On Mar 31, 2009, at 7:33 PM, Laen wrote:
>
> > A running dorkboard on its own (not running any external components
> > like LEDs) is about 20mA at 5V. I don't know what it would be at 3V.
> > I think the Atmega168Vs run a bit less, but I haven't hooked them up
> > to a meter.
> >
> > For the capacitor, I _think_ the math goes like this (someone correct
> > me if I'm wrong!)
> >
> > Volts^2 * Farads = Joules of energy storage.
> > Volts * Farads / amps = the amount of time it can put out that amount
> > of amps. In practice, it'll be much lower, because the voltage will
> > drop as you drain power.
> >
> > So:
> > a 3V, 1F supercap would run a Dorkboard for:
> > 3V*1F / 20 milliamps == 2.5 minutes.
> >
> > (By the way, google Calculator handles these conversions really well.
> > Enter "3V*1F/20 milliamps" into a google search, and you'll get that
> > answer.)
> >
> > -Laen
> >
> > On Mar 31, 6:36 pm, scott winner <sc... at scenbot.com> wrote:
> >> I am looking for some advice or tips.
> >> Here is my project,
> >>
> >> I want to run my Dorkboard on solor
> >> power. Don is setting me up with a 3 volt chip. That will help a
> >> lot. I am going to model the control after the Solorbotics voltage
> >> trigger; solor energy is stored in caps then dumped into the
> >> Dorkboard when a critical voltage is reached.
> >>
> >> So my question for the ether is, what
> >> size caps? How much power needs to be stored to run the Dorkboard?
> >> No motor function, just to blink the light. I know how much to run
> >> the motors that will be on a separate circuit.
> >>
> >> Ok go nuts folks.
> >>
> >> _________________________________________________________________
> >> All-in-one security and maintenance for your PC. Get a free 90-day
> >> trial!http://www.windowsonecare.com/purchase/trial.aspx?sc_cid=wl_wlmail
> >>
> >> _______________________________________________
> >> dorkbotpdx-blabber mailing list
> >> dorkbotpdx-blab... at dorkbot.orghttp://music.columbia.edu/mailman/listinfo/dorkbotpdx-blabber
> > _______________________________________________
> > dorkbotpdx-blabber mailing list
> > dorkbotpdx-blabber at dorkbot.org
> > http://music.columbia.edu/mailman/listinfo/dorkbotpdx-blabber
>
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> ------------------------------
>
> Message: 5
> Date: Tue, 31 Mar 2009 22:08:26 -0700 (PDT)
> From: Simran Gleason <fermatslasttheremin at yahoo.com>
> Subject: [dorkbotpdx-blabber] Haunted Garden installation: opening
> this thursday
> To: pdx dorkbot blabber <dorkbotpdx-blabber at dorkbot.org>
> Message-ID: <264089.98561.qm at web30701.mail.mud.yahoo.com>
> Content-Type: text/plain; charset=us-ascii
>
>
> Haunted Garden is a room that listens to you, figures out what notes are in your conversation, and composes
> ambient music with them. Thanks to Don's help, I got the light controller talking to my mac, so there will
> be lights (the system does a statistical analysis of the notes in short, medium, and long note windows,
> determines the key of those windows, and changes the lights according to the key).
>
> It's installed at ON Gallery this April, and the opening is this week, at First Thursday.
>
> ON Gallery
> 321 NW 6th Ave #101 between Everett & Flanders
> in the Everett station lofts
> Thursday April 2, 6-10pm
>
> If you haven't been to First Thursdays, it's a lot of fun. All the galleries around there
> are open, and people just wander down the streets stopping in to the various galleries,
> chatting & eating cookies.
>
> later in the month we're planning a Dorkbot Mixer at ON Gallery. I'll give a little
> talk about Haunted Garden, we'll get to play with it, and cetera.
>
> Simran
>
>
>
>
>
> ------------------------------
>
> Message: 6
> Date: Wed, 01 Apr 2009 02:39:29 -0700
> From: Paul Stoffregen <paul at pjrc.com>
> Subject: Re: [dorkbotpdx-blabber] Re: solor powered Dorkboard, fact or
> fiction?
> To: "A discussion list for dorkbot-pdx (portland, or)"
> <dorkbotpdx-blabber at dorkbot.org>
> Message-ID: <49D33651.20008 at pjrc.com>
> Content-Type: text/plain; charset=ISO-8859-1; format=flowed
>
>
> > Volts * Farads / amps = the amount of time it can put out that amount
> > of amps.
>
> This is the correct equation, but the "Volts" is not the voltage you've
> charge the cap up to, but rather the amount of voltage it will drop
> during that time.
>
> The really bad news is might be a small voltage. If you start at 3.0
> but your chip stops working near 2.7, then you can drop only 0.3 volts,
> so that 1F cap at 20 mA only lasts 15 seconds. It will actually last a
> little longer if your current decreases as the voltage decreases.
>
> You can increase the volts in the equation by charging the cap up to a
> higher voltage, and making your design run until the lowest possible
> voltage. If you're using the 16 MHz resonator, the chip isn't specified
> to work below 4.5 volts. Though it will "overclock" and run to lower
> voltages, if you can drop the clock to 8 MHz or less, you can safely run
> all the way down to 2.7 volts. If you charge the cap up to 5 volts,
> then you've increased the "volts" to 2.3.
>
> If the cap can handle higher voltage, you could try charging it up to 12
> volts and use a low power linear regulator like a LP2950 to get 3.0
> volts. Then you can drop from 12 down close to 3, which is 9 volts.
>
> Getting the current lower helps a lot, and Jared is right, using the
> powerdown mode really saves a lot. The only other thing you can do is
> make the cap bigger.
>
> Also, be careful charging the cap. A solar cell often puts out much
> more than its rated voltage if the current is low. You will probably
> need a zener diode or some other voltage limiting circuit in parallel
> with the capacitor if you're charging it up close to its maximum rated
> voltage.
>
>
>
>
>
> ------------------------------
>
> ........................................................................
> .........dorkbot: people doing strange things with electricity..........
> ......................... http://dorkbot.org ...........................
> ........................................................................
>
> End of dorkbotpdx-blabber Digest, Vol 34, Issue 1
> *************************************************
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