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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:<br><font style="font-size: 10pt;" size="2">
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<p style="font-size: 10px;"><font style="font-size: 10pt;" size="2">Reception for the Artists: 3 p.m. to 5 p.m., Sunday, April 5, 2009 </font><font style="font-size: 10pt;" size="2"><br></font><font style="font-size: 10pt;" size="2">Exhibition continues through May 14, 2009 </font><font style="font-size: 10pt;" size="2"><br></font><font style="font-size: 10pt;" size="2">Gallery talk noon, Thursday, April 23 </font><font style="font-size: 10pt;" size="2"><br></font><font style="font-size: 10pt;" size="2">Closed Easter Weekend (Friday – Sunday, April 10-12) </font><br></p><p style="font-size: 10px;"><font style="font-size: 10pt;" size="2">Marylhurst University</font><font style="font-size: 10pt;" size="2"><br></font><font style="font-size: 10pt;" size="2">17600 Pacific Highway (Hwy 43)/ Marylhurst, OR 97036-0261</font><font style="font-size: 10pt;" size="2"> (just south of Lake Oswego)<br></font><font style="font-size: 10pt;" size="2">Phone: 503.636.8141 / Toll-free: 800.634.9982 <br></font></p>More information at<br><br>http://www.marylhurst.edu/theartgym/2009srovideo.php<br><br>Hope to see you there; if we haven't already met, come on up and introduce yourself.<br><br>Dan Gilsdorf<br><br>> From: dorkbotpdx-blabber-request@dorkbot.org<br>> Subject: dorkbotpdx-blabber Digest, Vol 34, Issue 1<br>> To: dorkbotpdx-blabber@dorkbot.org<br>> Date: Wed, 1 Apr 2009 05:39:44 -0400<br>> <br>> Send dorkbotpdx-blabber mailing list submissions to<br>> dorkbotpdx-blabber@dorkbot.org<br>> <br>> To subscribe or unsubscribe via the World Wide Web, visit<br>> http://music.columbia.edu/mailman/listinfo/dorkbotpdx-blabber<br>> or, via email, send a message with subject or body 'help' to<br>> dorkbotpdx-blabber-request@dorkbot.org<br>> <br>> You can reach the person managing the list at<br>> dorkbotpdx-blabber-owner@dorkbot.org<br>> <br>> When replying, please edit your Subject line so it is more specific<br>> than "Re: Contents of dorkbotpdx-blabber digest..."<br>> <br>> <br>> Today's Topics:<br>> <br>> 1. solor powered Dorkboard, fact or fiction? (scott winner)<br>> 2. Re: solor powered Dorkboard, fact or fiction? (Laen)<br>> 3. Re: Re: solor powered Dorkboard, fact or fiction? (Jared Boone)<br>> 4. Re: Re: solor powered Dorkboard, fact or fiction?<br>> (Donald Delmar Davis)<br>> 5. Haunted Garden installation: opening this thursday<br>> (Simran Gleason)<br>> 6. Re: Re: solor powered Dorkboard, fact or fiction?<br>> (Paul Stoffregen)<br>> <br>> <br>> ----------------------------------------------------------------------<br>> <br>> Message: 1<br>> Date: Wed, 1 Apr 2009 01:36:31 +0000<br>> From: scott winner <scott@scenbot.com><br>> Subject: [dorkbotpdx-blabber] solor powered Dorkboard, fact or<br>> fiction?<br>> To: <dorkbotpdx-blabber@dorkbot.org><br>> Message-ID: <BAY125-W50863F448D6C73ABA8E955A88B0@phx.gbl><br>> Content-Type: text/plain; charset="iso-8859-1"<br>> <br>> <br>> <br>> <br>> <br>> <br>> <br>> <br>> <br>> <br>> I am looking for some advice or tips. <br>> Here is my project, <br>> <br>> <br>> I want to run my Dorkboard on solor<br>> power. Don is setting me up with a 3 volt chip. That will help a<br>> lot. I am going to model the control after the Solorbotics voltage<br>> trigger; solor energy is stored in caps then dumped into the<br>> Dorkboard when a critical voltage is reached. <br>> <br>> <br>> So my question for the ether is, what<br>> size caps? How much power needs to be stored to run the Dorkboard? <br>> No motor function, just to blink the light. I know how much to run<br>> the motors that will be on a separate circuit.<br>> <br>> Ok go nuts folks. <br>> <br>> <br>> _________________________________________________________________<br>> All-in-one security and maintenance for your PC. Get a free 90-day trial!<br>> http://www.windowsonecare.com/purchase/trial.aspx?sc_cid=wl_wlmail<br>> -------------- next part --------------<br>> An HTML attachment was scrubbed...<br>> URL: http://music.columbia.edu/pipermail/dorkbotpdx-blabber/attachments/20090401/3043067b/attachment-0001.html<br>> <br>> ------------------------------<br>> <br>> Message: 2<br>> Date: Tue, 31 Mar 2009 19:33:07 -0700 (PDT)<br>> From: Laen <james.neal@gmail.com><br>> Subject: [dorkbotpdx-blabber] Re: solor powered Dorkboard, fact or<br>> fiction?<br>> To: dorkbotpdx-blabber@dorkbot.org<br>> Message-ID:<br>> <0b07be6b-9b2d-4588-9cc1-5fbdb496bc2a@n7g2000prc.googlegroups.com><br>> Content-Type: text/plain; charset=ISO-8859-1<br>> <br>> A running dorkboard on its own (not running any external components<br>> like LEDs) is about 20mA at 5V. I don't know what it would be at 3V.<br>> I think the Atmega168Vs run a bit less, but I haven't hooked them up<br>> to a meter.<br>> <br>> For the capacitor, I _think_ the math goes like this (someone correct<br>> me if I'm wrong!)<br>> <br>> Volts^2 * Farads = Joules of energy storage.<br>> Volts * Farads / amps = the amount of time it can put out that amount<br>> of amps. In practice, it'll be much lower, because the voltage will<br>> drop as you drain power.<br>> <br>> So:<br>> a 3V, 1F supercap would run a Dorkboard for:<br>> 3V*1F / 20 milliamps == 2.5 minutes.<br>> <br>> (By the way, google Calculator handles these conversions really well.<br>> Enter "3V*1F/20 milliamps" into a google search, and you'll get that<br>> answer.)<br>> <br>> -Laen<br>> <br>> On Mar 31, 6:36 pm, scott winner <sc...@scenbot.com> wrote:<br>> > I am looking for some advice or tips. <br>> > Here is my project, <br>> ><br>> > I want to run my Dorkboard on solor<br>> > power. Don is setting me up with a 3 volt chip. That will help a<br>> > lot. I am going to model the control after the Solorbotics voltage<br>> > trigger; solor energy is stored in caps then dumped into the<br>> > Dorkboard when a critical voltage is reached.<br>> ><br>> > So my question for the ether is, what<br>> > size caps? How much power needs to be stored to run the Dorkboard?<br>> > No motor function, just to blink the light. I know how much to run<br>> > the motors that will be on a separate circuit.<br>> ><br>> > Ok go nuts folks. <br>> ><br>> > _________________________________________________________________<br>> > 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<br>> ><br>> > _______________________________________________<br>> > dorkbotpdx-blabber mailing list<br>> > dorkbotpdx-blab...@dorkbot.orghttp://music.columbia.edu/mailman/listinfo/dorkbotpdx-blabber<br>> <br>> <br>> ------------------------------<br>> <br>> Message: 3<br>> Date: Tue, 31 Mar 2009 19:43:08 -0700<br>> From: Jared Boone <jboone@earfeast.com><br>> Subject: Re: [dorkbotpdx-blabber] Re: solor powered Dorkboard, fact or<br>> fiction?<br>> To: "A discussion list for dorkbot-pdx (portland, or)"<br>> <dorkbotpdx-blabber@dorkbot.org><br>> Message-ID: <3E7021AA-5812-4656-8CFA-2364C2A72F1D@earfeast.com><br>> Content-Type: text/plain; charset=US-ASCII; format=flowed; delsp=yes<br>> <br>> The primary difference I'm aware of between the ATmega168 and the <br>> ATmega168V is that the "V" will operate down to 1.8V. I don't think it <br>> consumes any less power than the other part, at a given voltage and <br>> configuration. But as Laen alluded to, the lower the voltage you can <br>> operate at, the more juice you can squeeze out of a discharging <br>> supercap.<br>> <br>> I have spent a lot of time getting my Chronulator power consumption <br>> minimized. Since it's based on an ATmega168V, and is compatible with <br>> the Arduino tools, I have a lot of knowledge and code you can steal. <br>> Most of the tricks I employed are simply a matter of putting the chip <br>> to sleep when it's not doing anything, and making sure the chip never <br>> does anything it doesn't need to. Doing these things, I am able to <br>> operate a Chronulator at 1.8V and less than 200 microamps, which turns <br>> into 360 microwatts. Most of that goes to the meters that indicate the <br>> time. Take those out, and power consumption is maybe 20 microwatts on <br>> average.<br>> <br>> So what's your project, exactly? You have motors and an LED. What do <br>> the motors do, how often do they do it, and for how long? The same <br>> goes for the LED. And what kind of processing/computation will the <br>> Dorkboard be doing -- how often, and for how long? Depending on your <br>> answers, we could conceivably get your *average* current consumption <br>> down into microwatt territory too.<br>> <br>> - Jared<br>> <br>> On Mar 31, 2009, at 7:33 PM, Laen wrote:<br>> <br>> > A running dorkboard on its own (not running any external components<br>> > like LEDs) is about 20mA at 5V. I don't know what it would be at 3V.<br>> > I think the Atmega168Vs run a bit less, but I haven't hooked them up<br>> > to a meter.<br>> ><br>> > For the capacitor, I _think_ the math goes like this (someone correct<br>> > me if I'm wrong!)<br>> ><br>> > Volts^2 * Farads = Joules of energy storage.<br>> > Volts * Farads / amps = the amount of time it can put out that amount<br>> > of amps. In practice, it'll be much lower, because the voltage will<br>> > drop as you drain power.<br>> ><br>> > So:<br>> > a 3V, 1F supercap would run a Dorkboard for:<br>> > 3V*1F / 20 milliamps == 2.5 minutes.<br>> ><br>> > (By the way, google Calculator handles these conversions really well.<br>> > Enter "3V*1F/20 milliamps" into a google search, and you'll get that<br>> > answer.)<br>> ><br>> > -Laen<br>> ><br>> > On Mar 31, 6:36 pm, scott winner <sc...@scenbot.com> wrote:<br>> >> I am looking for some advice or tips.<br>> >> Here is my project,<br>> >><br>> >> I want to run my Dorkboard on solor<br>> >> power. Don is setting me up with a 3 volt chip. That will help a<br>> >> lot. I am going to model the control after the Solorbotics voltage<br>> >> trigger; solor energy is stored in caps then dumped into the<br>> >> Dorkboard when a critical voltage is reached.<br>> >><br>> >> So my question for the ether is, what<br>> >> size caps? How much power needs to be stored to run the Dorkboard?<br>> >> No motor function, just to blink the light. I know how much to run<br>> >> the motors that will be on a separate circuit.<br>> >><br>> >> Ok go nuts folks.<br>> <br>> <br>> ------------------------------<br>> <br>> Message: 4<br>> Date: Tue, 31 Mar 2009 20:13:21 -0700<br>> From: Donald Delmar Davis <ddelmardavis@gmail.com><br>> Subject: Re: [dorkbotpdx-blabber] Re: solor powered Dorkboard, fact or<br>> fiction?<br>> To: "A discussion list for dorkbot-pdx (portland, or)"<br>> <dorkbotpdx-blabber@dorkbot.org><br>> Message-ID: <5B124CCD-DE68-460F-85AA-FE62F78A22A6@gmail.com><br>> Content-Type: text/plain; charset="us-ascii"<br>> <br>> See page 303 of the datasheet.<br>> <br>> <br>> On Mar 31, 2009, at 7:33 PM, Laen wrote:<br>> <br>> > A running dorkboard on its own (not running any external components<br>> > like LEDs) is about 20mA at 5V. I don't know what it would be at 3V.<br>> > I think the Atmega168Vs run a bit less, but I haven't hooked them up<br>> > to a meter.<br>> ><br>> > For the capacitor, I _think_ the math goes like this (someone correct<br>> > me if I'm wrong!)<br>> ><br>> > Volts^2 * Farads = Joules of energy storage.<br>> > Volts * Farads / amps = the amount of time it can put out that amount<br>> > of amps. In practice, it'll be much lower, because the voltage will<br>> > drop as you drain power.<br>> ><br>> > So:<br>> > a 3V, 1F supercap would run a Dorkboard for:<br>> > 3V*1F / 20 milliamps == 2.5 minutes.<br>> ><br>> > (By the way, google Calculator handles these conversions really well.<br>> > Enter "3V*1F/20 milliamps" into a google search, and you'll get that<br>> > answer.)<br>> ><br>> > -Laen<br>> ><br>> > On Mar 31, 6:36 pm, scott winner <sc...@scenbot.com> wrote:<br>> >> I am looking for some advice or tips.<br>> >> Here is my project,<br>> >><br>> >> I want to run my Dorkboard on solor<br>> >> power. Don is setting me up with a 3 volt chip. That will help a<br>> >> lot. I am going to model the control after the Solorbotics voltage<br>> >> trigger; solor energy is stored in caps then dumped into the<br>> >> Dorkboard when a critical voltage is reached.<br>> >><br>> >> So my question for the ether is, what<br>> >> size caps? How much power needs to be stored to run the Dorkboard?<br>> >> No motor function, just to blink the light. I know how much to run<br>> >> the motors that will be on a separate circuit.<br>> >><br>> >> Ok go nuts folks.<br>> >><br>> >> _________________________________________________________________<br>> >> All-in-one security and maintenance for your PC. Get a free 90-day <br>> >> trial!http://www.windowsonecare.com/purchase/trial.aspx?sc_cid=wl_wlmail<br>> >><br>> >> _______________________________________________<br>> >> dorkbotpdx-blabber mailing list<br>> >> dorkbotpdx-blab...@dorkbot.orghttp://music.columbia.edu/mailman/listinfo/dorkbotpdx-blabber<br>> > _______________________________________________<br>> > dorkbotpdx-blabber mailing list<br>> > dorkbotpdx-blabber@dorkbot.org<br>> > http://music.columbia.edu/mailman/listinfo/dorkbotpdx-blabber<br>> <br>> -------------- next part --------------<br>> An HTML attachment was scrubbed...<br>> URL: http://music.columbia.edu/pipermail/dorkbotpdx-blabber/attachments/20090331/cc0c616d/attachment-0001.html<br>> <br>> ------------------------------<br>> <br>> Message: 5<br>> Date: Tue, 31 Mar 2009 22:08:26 -0700 (PDT)<br>> From: Simran Gleason <fermatslasttheremin@yahoo.com><br>> Subject: [dorkbotpdx-blabber] Haunted Garden installation: opening<br>> this thursday<br>> To: pdx dorkbot blabber <dorkbotpdx-blabber@dorkbot.org><br>> Message-ID: <264089.98561.qm@web30701.mail.mud.yahoo.com><br>> Content-Type: text/plain; charset=us-ascii<br>> <br>> <br>> Haunted Garden is a room that listens to you, figures out what notes are in your conversation, and composes<br>> ambient music with them. Thanks to Don's help, I got the light controller talking to my mac, so there will<br>> be lights (the system does a statistical analysis of the notes in short, medium, and long note windows, <br>> determines the key of those windows, and changes the lights according to the key). <br>> <br>> It's installed at ON Gallery this April, and the opening is this week, at First Thursday.<br>> <br>> ON Gallery<br>> 321 NW 6th Ave #101 between Everett & Flanders<br>> in the Everett station lofts<br>> Thursday April 2, 6-10pm<br>> <br>> If you haven't been to First Thursdays, it's a lot of fun. All the galleries around there<br>> are open, and people just wander down the streets stopping in to the various galleries,<br>> chatting & eating cookies. <br>> <br>> later in the month we're planning a Dorkbot Mixer at ON Gallery. I'll give a little<br>> talk about Haunted Garden, we'll get to play with it, and cetera.<br>> <br>> Simran<br>> <br>> <br>> <br>> <br>> <br>> ------------------------------<br>> <br>> Message: 6<br>> Date: Wed, 01 Apr 2009 02:39:29 -0700<br>> From: Paul Stoffregen <paul@pjrc.com><br>> Subject: Re: [dorkbotpdx-blabber] Re: solor powered Dorkboard, fact or<br>> fiction?<br>> To: "A discussion list for dorkbot-pdx (portland, or)"<br>> <dorkbotpdx-blabber@dorkbot.org><br>> Message-ID: <49D33651.20008@pjrc.com><br>> Content-Type: text/plain; charset=ISO-8859-1; format=flowed<br>> <br>> <br>> > Volts * Farads / amps = the amount of time it can put out that amount<br>> > of amps.<br>> <br>> This is the correct equation, but the "Volts" is not the voltage you've <br>> charge the cap up to, but rather the amount of voltage it will drop <br>> during that time.<br>> <br>> The really bad news is might be a small voltage. If you start at 3.0 <br>> but your chip stops working near 2.7, then you can drop only 0.3 volts, <br>> so that 1F cap at 20 mA only lasts 15 seconds. It will actually last a <br>> little longer if your current decreases as the voltage decreases.<br>> <br>> You can increase the volts in the equation by charging the cap up to a <br>> higher voltage, and making your design run until the lowest possible <br>> voltage. If you're using the 16 MHz resonator, the chip isn't specified <br>> to work below 4.5 volts. Though it will "overclock" and run to lower <br>> voltages, if you can drop the clock to 8 MHz or less, you can safely run <br>> all the way down to 2.7 volts. If you charge the cap up to 5 volts, <br>> then you've increased the "volts" to 2.3.<br>> <br>> If the cap can handle higher voltage, you could try charging it up to 12 <br>> volts and use a low power linear regulator like a LP2950 to get 3.0 <br>> volts. Then you can drop from 12 down close to 3, which is 9 volts.<br>> <br>> Getting the current lower helps a lot, and Jared is right, using the <br>> powerdown mode really saves a lot. The only other thing you can do is <br>> make the cap bigger.<br>> <br>> Also, be careful charging the cap. A solar cell often puts out much <br>> more than its rated voltage if the current is low. You will probably <br>> need a zener diode or some other voltage limiting circuit in parallel <br>> with the capacitor if you're charging it up close to its maximum rated <br>> voltage.<br>> <br>> <br>> <br>> <br>> <br>> ------------------------------<br>> <br>> ........................................................................<br>> .........dorkbot: people doing strange things with electricity..........<br>> ......................... http://dorkbot.org ...........................<br>> ........................................................................<br>> <br>> End of dorkbotpdx-blabber Digest, Vol 34, Issue 1<br>> *************************************************<br><br /><hr />Windows Live™: Keep your life in sync. <a href='http://windowslive.com/explore?ocid=TXT_TAGLM_WL_allup_1a_explore_042009' target='_new'>Check it out.</a></body>
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