Submitted by brad on Mon, 2006-02-13 13:50.
Note 1: NBC doesn’t have nearly enough HD cameras for the Olympics, and I can’t really blame them for not having one for every section of luge track to show us something for half a second.
But it seems in many areas they are showing us a widescreen image from an SD camera, and it looks more blurry than the pillarboxed SD footage they show of past scenes. I wonder, are they taking a cropped widescreen section out of their 4:3 SDTV camera? If so, that’s not what I want. Or are there a lot of 16:9 SD cameras out there?
Note 2: I haven’t researched much how people are using broadcast HD cameras for live events, but notes I have found suggest the camera crews shoot in 16:9 and compose the frame so that the 4:3 frame in the middle will look good for downconvert.
I propose a fancier scheme. Sometimes you want HD to get more detail on the same scene. Sometimes you want it to get the same detail and a bigger view, especially in sports. It would be good if somebody (camera operator or directors in control room) could set the crop box dynamically. It could just be a 4:3 box in the middle, or panned left and right, but it could and should also be a smaller box anywhere in the frame, perhaps 2/3rds of the frame height (a 480 line section of a 720 line field) or even a 480 line section of a 1080 line field.
The camera operator would have to see a clearly marked box in their viewfinder, to show what the current 4:3 SDTV view is like, and compose to assure the main action is in that box. In the meantime HD viewers would see the whole scene. When it makes more sense to show both viewers a similar view, the box would pull out. In theory, the box could pull out all the way so the SDTV viewers see a letterboxed view, though I doubt many networks would use that.
It would be confusing for the camera operator to do this at first, and it might make sense for the control room folks to do this at least some of the time.
This would also be a sort of digital zoom for the SDTV viewers, and the UI might be integrated into the zoom control. Possibly a button would control whether an optical zoom was done, or the SDTV view was shrunk.
Anybody know if they’re doing it this way? I’ve certainly seen TV shows like SNL recently that are clearly composed for 16:9. Are we seeing a crop of the 4:3, or are the 4:3 people seeing letterbox? I would have to tune both programs to find out.
Submitted by brad on Mon, 2006-01-02 14:14.
I’ve written before about the desire for a new universal dc power standard. Now I want to rethink our systems of household and office power.
These systems range from 100v to 240v, typically at 50 or 60hz. But very little that we plug in these days inherently wants that sort of power. Most of them quickly convert it to something else. DC devices use linear and switched mode power supplies to generate lower voltage DC. Flourescent lights convert to high voltage AC. Incandescent bulbs and heating elements use the voltage directly, but can be designed for any voltage and care little about the frequency. There are a dwindling number of direct 60hz AC motors in use in the home. In the old days clocks counted the cycles but that’s very rare now.
On top of that, most of what we plug in uses only modest power. The most commonly plugged in things in my house are small power supplies using a few watts. Most consumer electronics are using in the 50-200w range. A few items, such as power tools, major appliances, cooking appliances, heatters, vacuum cleaners and hairdryers use the full 1000 to 1800 watts a plug can provide.
So with this in mind, how might we redesign household and office power… read more »
Submitted by brad on Sat, 2005-12-31 14:03.
I’ve written before about automatic self-driving cars, both their risks (overregulation due to fear of their use by terrorists) and possible driving forces (oil companies excited by people taking longer trips) and more.
Generally, except for a few specialized applications (such as the automatic parking lot) such cars, if they are to be used where people or cars that may not under network control are present, must start with a basic ability to avoid accidents. In a vigourous debate with friend Charles Merriam last night, the question came up about where the value will lie. Charles is a big proponent of worrying first about crash-avoiding cars.
Right now we all pay from $250 to $500 per year, and often much more, for insurance to cover the risk of accidents. Of course, that’s just the financial cost, and financial proxies for suffering, so the real value we would put on an accident resistent car might be much higher. Perhaps $5,000 to $10,000 over the life of the car.
That seems like a highly lucrative market on its own. While the self-driving car has many other long term merits (because you can do other work while moving, and you don’t have to park it, and it can appear on demand as a taxi for you) we should be very close to financially justifying the accident-avoiding car today… read more »
Submitted by brad on Thu, 2005-09-22 21:31.
The reason that eBay paid such a huge price for Skype has now become clear. There were several companies competing to buy Skype, and just before the bidding closed, eBay decided the best way to win was to place a giant bid just a few seconds before the end. (This might be known as bid skyping.)
On a serious note, it has long been eBay policy, it is reported, to not want to facilitate communications between buyers and sellers, because they will just arrange to avoid eBay fees by selling outside eBay. Either this has changed, or the “obvious” parts of the plan — Skype presence on eBay auctions, “Skype the seller” buttons and so on, are not part of the value for eBay.
Submitted by brad on Tue, 2005-09-13 18:43.
Every time I take an RV trip (ie. each Burning Man) I come up with more observations. The biggest one is that it cost $360 in gasoline to go from the bay area to the black rock desert, about 800 miles. And that’s at a price still well below world price. The RV owner said he was planning to get out of the business, people no longer want to pay the gas price.
So why is it taking so long to produce a hybrid RV? Hybrid cars are great of course, but trucks and RVs are what really suck gas and need the improved efficiency. And they have the room for larger and more unusual engine configurations. Most of all, RVs also mostly come with expensive generators and batteries, and a hybrid RV would of course have a super duper power plant and batteries and inverters, presuming the engine was efficient at lower revs. The Hybrid RV’s power plant could also be a backup generator when parked at the non-moving home. Probably make the most sense with diesel fuel, or as I have suggested before, even the highly efficient stirling engine. (Stirlings are big, and take time to warm up, but an RV with batteries is fine with this.)
Every RV’s shower has this hose based showerhead with an on-off dial with a slight leak. Our camp built a much nicer shower using a standard kitchen sprayer. A kitchen sprayer with a lock-on would be much better and would make it easier to conserve water by letting you pulse water where you need it when rinsing.
Cleaning the RV, especially when back from the desert, is hard. RV renters charge fat cleaning deposits and fees. Why doesn’t some company that hires out housekeepers do an RV service. You could come to them. Drive in, and a team of 5 attacks your RV, cleaning it in minutes. Do it at a car wash to also handle the outside if needed. Espcially after Burning Man there’s a business here.
I’ve said these before: Paper towel racks, built-in soap dispensers, inverters, flourescent lights. Why aren’t these everywhere in the RV world, instead of being rare?
Stabilizers jacks are great, but how about something simpler, some way to lock the springs or shocks (of course with an interlock to prevent starting the vehicle!) And while slide-outs are great, why do we never see flip out beds the way pop-top campers have, or a pop-up on the cab-over bed? (Most RVs don’t have any spare wall space except in the master bedroom, which does limit the flip-out bed concept. You also almost never see murphy beds.) Flip-out beds don’t take away your dinette or couch as do the extra beds commonly found. And how about a seat belt design for use on the beds for safe sleeping while driving? You can do this now but it doesn’t seem super safe.
Submitted by brad on Thu, 2005-09-08 11:32.
If you noticed a long break in the blogging, it’s because I was at Burning Man. And while people do blog from Burning Man, it’s not what you want to spend your time doing. I will have more entries in the future, but let me relate some stories of the network and the phone booth first.
Last year, we erected a free phone booth in the desert to great results. This year, it was going to be even better because of a plan for a new internet connection. In the past, John Gilmore had brought his satellite dish, which had all the latency and bandwidth limits of satellite. This year he splurged on getting a microwave link in, which will be even faster next year. Sadly, much of that money was wasted because we never got the “first mile” — the on-playa 802.11 network — operating at a satisfactory level. There was huge packet loss and jitter in most places, when it was up at all. Next time some of the money will go into better equipment and planning for the local network.
As such, the phone booth, located in our camp on 7:30, only worked intermittently and rarely with great voice quality. We eventually decided to sacrifice the aesthetic purity of a booth sitting in the desert, connected to nothing, and moved it on its wagon by trike to the center camp, home of the incoming microwave link. The we set it up on the street, with an ethernet wire snaking in. We were no longer wireless, but the voice quality was top notch. I wasn’t able to spend much time with it but reports were that the line got very long at times.
In our own camp, you could tell if it was working or not based on whether there was a line. Even waiting for it to work was better than the 2-3 hour time investment of taking the bus to the phone booth in Gerlach.
Last year, I recounted the emotional experience people had using an unexpected and impossible phone to hear the voices of loved ones. This year, this was magnified by Katrina. I learned of Katrina, in fact, when people came to ask to use the phone to contact their relatives in NOLA. (Read on…) read more »
Submitted by brad on Sat, 2005-08-20 01:30.
I’ve called before for a system of Universal DC Power and I still want it, but there is a partial step we could take.
I have a laptop power supply that comes with a variety of tips. The tips tell (through something as simple as a resistor) the power supply how much voltage and current to supply for the laptop they are designed for. I bought mine for use in an airplane, others are sold that do both 12v and AC power.
I would like to see one designed for the corporate market, rather than the carry-around market. Ones to be left in offices and under conference tables, so that when somebody visits with a laptop, they can plug it in. No need to get out their own supply or eventually no need to bring it.
Unlike the carry-around where you pick your tip and leave the rest, this would have an array of tips, possibly rotating on a click-wheel, or all connected to a switch where one can dial the voltage/polarity/etc.
Some companies take more drastic steps. At Google for example, I notice they have standardized on thinkpads, and so all desks and conference tables have think pad supplies. Everybody is able to roam the building and be sure of laptop power. These supplies, while a bit more expensive, could solve the same problem.
An alternate would be to standardize the special tip that describes the power needed. Everybody could get a tip or pigtail for their laptop and carry just that around. Conference rooms could in fact have single supplies that let you plug in several of the pigtail. Of course that is halfway to my original proposal.
Now it turns out a considerable majority of laptops take either 16 volts or 19 volts. The main rebel is Dell, which uses funny plugs and often over 20v. Some need more current than others, I don’t know if any need current limiting or if simply making the PS capable of 100w would do the trick. Anyway, in this case, we could develop a standard 16v plug (the thinkpad one) and a different standard 19v plug (probably an HP one), in two different shapes and colours, and people with laptops could carry a cheap converter to plug their laptop into it. Over time, laptops might come directly able to use this, if they aren’t already — on our path to a smarter power bus. Then people could say, “Oh, you have the orange plug. Great, I can plug my laptop into that.” Vendors who make laptops that won’t plug into one of these two will probably think about switching.
Submitted by brad on Mon, 2005-08-15 01:01.
As some will know, I got heavily into the Hugo awards 13 years ago during my efforts at becoming an eBook publisher in the SF field. The Hugo award is voted on by the fans who attend the annual World Science Fiction Convention, or Worldcon, a moderately small voting pool (under 1000 of the typical 4000 to 7000 attendees will vote.)
The most important award and 2nd most voted on is the one for best Novel. The least important, but most voted on award is the one for best movie.
But still, for a long time, though both SF and Fantasy qualified for the award, the best Novel went exclusively to Science Fiction (with one dab into alternate history by Phillip K. Dick) and usually to hard, ideas-based SF. This went on until 2000 when the superb hard-SF novel “A Deepness in the Sky” won. The drama award was also heavily into SF, though it had some deviations, such as the coverage of Apollo XI and a few films in the 80s.
But in 2001, for the first time, a Fantasy novel won the best novel Hugo. Not just any fantasy novel, but a children’s novel, Harry Potter 4. Of course, the Harry Potter series is the most remarkable success not just in fantasy, but in publishing, so this is not too shocking. What’s surprising is that in 2002, 2004 and 2005 a fantasy novel would win best novel. At the same time, fantasies won all the best movie awards and all of the new best TV episode award until 2005. (Read on…) read more »
Submitted by brad on Mon, 2005-06-27 10:54.
Last year at Burning Man, I built a free phone booth out on the desert. Using VoIP, 802.11, batteries and a satellite uplink, it sat there on the playa floor and let you make free calls anywhere in the world. I blogged about that story, but there was an untold part of the story.
The phone had a number that outsiders could call, and they did, and sometimes people there answered. If not they left voice mail. The voice mail told them to describe the target of their message and offer a bribe to the listener to deliver it. Alas, due to technical problems, we never really got an active system in place to deliver the voice mails, but people still left some. Recently I pulled them out and listend, and they are great fun, especially if you know Burning Man.
Within the mails are calls of love from moms, little kids, dads, lovers and
friends. There’s a joke (I hope) firing from a boss and a proposal of
marriage. There’s a hurricane warning and many descriptions that
could never have found their target in our giant city (“She’s a blonde
camped along 4:30 I think.”) Also fun are the offered bribes to
deliver the messages.
Since everybody knew they were leaving a message for any random stranger to hear, I think it’s fine to have them on the web.
I don’t think you have to be an ember to enjoy these. Just imagine the context of an entire city of 40,000 people with one phone, one voice mail, and people trying to get messages in.
They can be heard at this page of Burning man voice mails. You can either read the short summaries to pick the best voicemails, or like me, just listen to them raw from the combined file or ZIP archive.
Submitted by brad on Thu, 2005-06-16 23:08.
I’ve written a few times about Peerflix the P2P DVD trading system similar to some of my own ideas. After trying it for a few months, I have to report trouble.
As I feared, as a DVD drops in popularity, it means somebody will be stuck with it. I feel it should be the original contributor but in Peerflix, it’s whoever happens to have traded for it most recently. Back in April, I got in 4 DVD trades for high quality movies 1-2 years in age. In particular for Momento, Mystic River, School of Rock and A Mighty Wind. I have been slow to getting to watch these, so I’ve gotten to see just how many chances there have been to return them.
In 2 months, we’ve seen just a couple of requests for Momento and Mystic River. In all those cases, if I didn’t respond to the request within a short time, a few hours at most, somebody else would send off their copy of the disk and I would remain stuck with it. Of course since I have not yet watched Mystic River, I may have just not been motivated enough to say yes. Today I got my first request to send off A Mighty Wind and did not agree in time. I have not ever gotten a chance to send off School of Rock.
Now for “new releases” this is not the case. The DVDs I contributed that were recent and in high demand did get requested quite quickly. But the lesson quickly learned is that if you want to watch a slightly older DVD, you truly are buying it rather than borrowing it. If rapid watching is your goal, trading off a recent DVD for an older one will leave you in the lurch.
Now it’s true that at video stores, they say that only new releases really draw the volume, so this perhaps is no surprise. But it’s also not a very workable system. I was debating recommending my family in Canada join up, but with the smaller membership group there, I fear it could be even worse. The cheaper plans from Netflix or other competitors make more sense.
Update: I don’t watch DVDs very often due to my MythTV always having good HD shows in it (once you have HD it’s hard to go back to regular TV or even DVD) so I’ve seen frightening patterns. Peerflix put out a recommendation for Memento on their blog, so I now get requests for it moderately often. However, in the past 8 months, I have barely seen any requests for Mystic River, School of Rock or A Mighty Wind, all top-rated films if a few years old. And none of the couple of requests I have seen for these films have come when I was around — and I’ve only been away perhaps 15% of the time at most.
Update2: School of Rock was finally requested in December, I got the Pianist in exchange. Probably another long-term camper.
Submitted by brad on Thu, 2005-04-07 11:36.
Earlier I reported on Peerflix, which is implementing a P2P DVD sharing system with similarities to some of my own ideas. I have tried it out a bit now, and learned a bit more. I also have updated experiences with Peerflix.
The web site is marked beta and still very buggy, which is bad, but my first try on the service was first-rate. I mailed off my first DVD, Eternal Sunshine of the Spotless Mind, on Wednesday to somebody in San Jose (who almost surely got it today) and got the replacement for it — by strange coincidence another memory-related movie called Memento in the mail today. That is faster than most of the services, though people like Netflix could be this fast if they decided to take the same step and trust you when you said you mailed a disk, rather than waiting for it to arrive.
All this is good, but there’s still a killer flaw in the idea of actually selling the DVDs. All DVDs will have a limited lifetime of high-demand. As demand drops below supply, somebody holding the DVD at that time will get “stuck” with it, though you can fix that by being fast on the draw in agreeing to be the one to mail any new requesters that do come along. read more »
Submitted by brad on Tue, 2005-03-22 06:12.
For the past couple of years, I've been mulling over an idea for a different kind of DVD "rental" company, similar in ways to the popular NetFlix. Now I have encountered a new company called Peerflix which is doing something similar. Is it annoying or vindicating to see somebody else run with something? :-)
So instead I will comment on Peerflix, which I am going to try out, and what I planned to do differently.
The rough idea is a movie network that doesn't own the movies. The members do. The members declare what disks they have that are available to go out (key in or scan UPC codes or just put disks in drives) and, just like netflix, they also browse the list of DVDs and pick what they would like to rent. For each disk you have out, you are entitled to one in (approximately), and somebody close to you, who has the disk you want, is told to mail it to you.
Once scaled up, it's faster than netflix (the disk is mailed to you directly from the last person to have it, rather than going through the warehouse) but mainly it's vastly cheaper. In theory it could even run for free, with postage and mailers being the only cost -- plus of course the initial disks you introduce into the system. Netflix 3-at-a-time is $216/year, the one at a time is $120 per year.
There are, however, a number of interesting problems to solve in doing this, and some special factors you may not know about Netflix. read more »
Submitted by brad on Wed, 2005-02-16 11:35.
Earlier, I wrote some proposals for improving ebay style feedback, including not having feedback revealed until both have left it. That has some flaws, but the main reason eBay is unlikely to do this is that eBay likes feedback to be positive, they want to convince buyers it is safe to shop there.
So here’s an alternate idea to prevent revenge feedback. Revenge feedback is only vaguely in eBay’s interests, in that the fear of it keeps feedback positive, but the existence of it adds to the negatives.
To solve this, attempt to detect revenge feedback and print statistics on it. What would be detected is negative feedback left by a seller on a buyer after the buyer has left negative feedback, but not if the buyer left this feedback immediately.
In theory the buyer has just one duty — to pay promptly. Indeed, since eBay owns PayPal they could also just report about buyers whether they paid promptly with PP and that should be all you need to know. Sellers might want to tag a “troublesome buyer” who has a lot of complaints after getting the item but I think that’s in an entirely different class of feedback anyway.
So really, a seller should leave feedback once the buyer has paid, and negative feedback only if the buyer pays slowly, pays falsely or doesn’t contact the seller.
Under my system above, if the seller waits to give feedback, in particular waits until after the buyer gives feedback, she’s taking a risk that her own negative feedback will get counted in the revenge count. And a high revenge count will scare away deals, deservedly.
More simply, the system could also just count how often the feedback came in the expected order (Seller’s first, then Buyer’s) and how often the other way around. This would strongly encourage sellers to feedback first. You would see when bidding that a seller always or rarely feedbacks on payment, and again, stay away from those who don’t.
Now admittedly, with the fear of revenge feedback gone, buyers would be more honest, and reputations would drop a bit. eBay might still want to avoid this, but with luck it would not be a big change.
Updated thoughts: It may be time for a 3rd party company to begin offering more detailed reputation information. Since eBay has stopped robots it doesn’t like, this would have to be on-client software which extracts results of transactions from eBay to another database that a browser add-on (like ShortShip) can display. All the useful information could be stored — feedback order, possible revenges, feedback based on dollar volume etc. Counting no-feedback transactions is harder and probably requires a blockable spidering operation or some complex shared network. To this one could add more feedback done outside of ebay, including revenge claims and full text stories that eBay doesn’t allow in feedback comments.
Useful hint: eBay doesn’t allow URLs in feedback, but if you invent a random string you can put ‘Search for randomstring’ in the feedback comment, and make a web page with that string in it that Google and the rest will find. Then people wanting to know more than 80 characters can learn it. Of course, the other party can also make a web page with that string so searchers see both sides, which is fine. A good non-random string might be something like eBay followed by the item number, as in ‘eBay130064299000’ — in fact, if such a method became common you could search for it without even needing it in the feedback.
Submitted by brad on Tue, 2005-01-25 17:43.
I love hard disk video recorders because they surprised me by being much more than super-fancy VCRs. They changed the nature of the way people watched TV in ways I didn't expect.
Now I've been working with MythTV which is an open source PVR. I have a new program in development, and if any of the readers out there are using MythTV I wouldn't mind some folks to test it out before I announce it to the Myth community.
This program does many things, including two things that I think could change the nature of how TV is chosen.
The system, called TVWish is in general a wishlist program. It lets you build large lists of TV you're looking to see. If the shows you want come on anywhere on your TV schedule, even years later, it will record them.
For example, I have gathered a list of hundreds of top movies, trimmed to what I have not seen and put it in my wishlist. Now if one of those movies shows up, I will see it. Reminds one of netflix perhaps.
The two big changes however are not this, though it's handy.
First, you can import your wishlist from a web URL. That lets you trust somebody else to program what TV your box will record. I call this a "critic" function because you could name the URL of a TV critic who recommends shows. I anticpate one day the same critics who get advanced tapes of shows and write newspaper columns about tonight's TV might create a list so that your box records it.
But it can mean much more than this. A "critic" can be a friend who recommends shows to you. It can be people on the east coast telling west coasters what was good in the lineup. It can be thousands of fans watching shows and rating them on their remote control, causing people to record and not record shows that night or in reruns. It can be people amalgamating the opinions of viewers and professional critics to redirect how you hear about TV.
The second element reflects something I wrote about before in my essays on the future of TV. I now call it Abridging a TV Series
Here, you take a series that is in reruns or syndication. You get a list of the episodes, ranked in order of quality. You put this list into my program and set a quality level. And you only watch the best. You skip the turkeys. Life is too short to watch bad TV. Already many TV show fan sites have episode lists with ratings, either critical or based on fan votes. I've been using these lists to manually abridge series and it's amazingly producitve. A mediocre series turns into a shorter, excellent one. read more »
Submitted by brad on Mon, 2004-10-11 12:10.
Well, a couple of weeks ago when I announced the phone project at Burning Man, I implicitly was linking to my new galleries for Burning Man 2004. However, let me officially announce those galleries now, plus the addition of a new gallery today.
Submitted by brad on Mon, 2004-10-04 07:11.
I'll be speaking at three conferences in the near future, and can offer discounts to blog readers for two of them.
Coming up October 19, I will be speaking on the future of SIP, and whether IAX2 or Skype might kill it, at the Pulver Voice on the Net conference in Boston.
Nanotech and Privacy
Later that week, I will chair day 2 (Sat, Oct 23) of the Foresight Conference on Advanced Molecular Technology in Washington, DC. Friday is about technology, Saturday is about Applications, Sunday is Policy. On Saturday I will deliver a talk on the merits of privacy which will lead into a debate about privacy and surveillance in the nanotech world.
Blog readers who wish to attend this conference can get a 30% discount by using registration code BRAD30-CP.
Debating David Brin on Privacy
Then, on November 6, I will do a similar debate at Accelerating Change 2004, this time with noted Science Fiction author David Brin (who also wrote "The Transparent Society.) Blog readers can get a $50 discount before Oct 20 by using the code AC2004-BRAD.
After that it's off to the Vintage Computer Festival, and Hackers.
Burning Man Decompression
Plus, before all that, this Sunday I will be at the Burning Man Decompression party, a small taste of Burning Man on the city streets. I will display my latest giant photographs, plus my Star Map and with luck we will have the phone booth in operation, though it won't be as out of place on a city street.
EFF Salon on E-Voting
And finally, though I won't be speaking at it, the EFF has restarted our BayFF series of talks and salons on major issues. The next is Tuesday, October 12, 7pm at the 111 Minna Gallery in San Francisco on the subject of e-voting and the upcoming election. Free, but how much would it hurt you to donate?
Submitted by brad on Thu, 2004-09-16 08:56.
One core reason I haven't blogged much in the last while is the flurry of activity regarding my annual trip to Burning Man. I've prepared a page about one of my too-many projects this year, which was to build an incongruous phone kiosk in the middle of the desert which worked and let you call anybody in the world for free. It was battery powered, and used 802.11 and Voice over IP combined with a satellite internet connection.
The reaction was remarkable and I have made a set of pages about phone booth and reaction to it. including pages on the building of it, galleries of photos of people using it (including, of course, naked people) and maps of all the places people called.
(I will probably submit this to slashdot next week to test my server!)
Now my goal was to take some highly familiar technology and put it in a place where it seemed impossible. And indeed, most people refused to believe it was "real" since there are other joke phone booths at Burning Man. Their disbelief and shock were what made it fun, as well as the emotional experiences and gratitude that came when people heard distant voices. It was a taste, in a small way, of what the phone meant when it was new.
I have much more stuff about Burning Man to blog in the days to come.
Submitted by brad on Tue, 2004-09-14 09:25.
I finally watched the closing ceremonies yesterday (did not see them while at Burning Man, obviously.) I liked the blinky balls that the children and audience members had, and the sense that the flame lit the LED ball. But it was just manual, people pushed buttons.
It occured to me it would not be too expensive to make an LED blinky that worked a bit like flame. While it was on, it would transmit a particular signature code in its blinking. If another blinky got close enough to see this brightly enough, it would detect it and turn itself on for some period of time. You could tune the range, it's just a photoresistor.
That way they could "light" their neighbours the way a flame does, and the flame would pass along. With the range tuned to a few feet, the lighting would have propagated through the audience at some speed (you could define what the speed would be.)
This would also be a fun rave/party favour. You might be able to light your own or you could light from somebody else. Perhaps after too long alone the blinky would go out and need to be lighted from somebody else's, encouraging socialization.
Submitted by brad on Mon, 2004-09-13 11:53.
We all would love solar power to work better, but it's hard to have it make economic sense yet, at least if you're near the grid. A solar panel takes 4 years just to give back the energy it took to build it, and it never pays back the money put in if you compare it to putting the money into the stock market. And that's with full utilization. If you use panels and batteries, any time your batteries are near full the power is being discarded, and you also have to replace your batteries every so often and dispose of the old lead-filled ones. Yuk. A grid-tie can use all the power of a panel but that's an expensive, whole-house thing.
But here's a start -- a solar-using PC power supply. My PCs, like many folks', are on all day, including the peak-demand heat of the day. Desktops draw anywhere from 50 to 200 watts even when idling.
So make a PC power supply that has 3 external connections. One for the wall plug. And two optional ones, one for a 12v solar panel and one for a battery. Then sell it with a 50w or 100w solar panel -- most importantly, the panel should not ever generate more power than the PC uses.
Because of that, during the bright part of the day, the panel will be providing most, or just barely all, of the power for the PC. The wall plug will provide the rest. At night, the wall plug would provide all the power. It's a grid-tie but it doesn't feed power back to the grid, it just reduces demand on it. The 100w panel takes 100w off the grid load during the peak demand times. And we use every watt the panel generates, we never throw any away. read more »
Submitted by brad on Thu, 2004-09-09 13:49.
First entry in a while due to trip to Burning Man ... more on that later. This time I returned to RV rental, after 2 years in a tent, so I thought I would make some notes on that.
It amazes me how little attention mainstream RVs pay to what is called "dry camping" -- away from electrical and water connections. Yes, they have batteries, tanks and generators, but it's very rare to see an RV use fluorescent lights, for example, even though they are available in 12v form and take 15% or less of the power of the incandescent lights they currently use. If running off batteries this is a no-brainer.
Inverters are also cheap these days, and more efficient. Some draw almost nothing now when not loaded, so a built in inverter to run 110v gear efficiently off the batteries also makes sense. As noted, a 1kw inverter is today quite cheap, and could even run the microwave, though you would not want to do that much. An automatic system to run mostly from battery but start the generator on-demand during daytime hours if it gets low could make sense.
Solar kits are sold for RVs but are rare and rarely standard. It also amazes me that they don't come standard with built in liquid soap dispensers, paper towel racks and other things to keep the commonly used stuff secure.
We have found it handy to use the rubbermaid (or similar) plastic storage boxes to put multiple boxes in the overhead storage. Pull out drawers would also make sense here. Each time you move you have to "rig for silent running" and some RVs we have rented come with metal blinds that will clank and clank unless you stuff towels into them.
The latest RVs only fill their water tank from a standard pressurized hose. Turns out that's a curse at burning man because the water truck is not allowed to have such a fixture due to the risk of backflow from an unknown tank. Doubt we will see a fix for that as it is an unusual problem.
RVs come with very low precision monitor guages, from before the digital age. They show you that your tanks are at 0, 1/3, 2/3 and full, for example, and likewise for your battery. On the fresh water tank they could measure flow through the water pump to get a much more accurate figure, and if they detected if the toilet was the use, they could also know how much was likely in the gray tanks. The black tank (sewage) sensors have been broken on every RV I have ever encountered, they gum up with toilet paper. You would think after decades of having unusable sensors they would devise some other method, such as a pressure sensor under a heavy membrane, or bouncing sound waves or light off the top of the sewage. You can of course shine a flashlight down the toilet, but that's harder to judge than you might think and of course not very pleasant.
Measuring the battery accurately is of course a much easier task, and I use my voltmeter to do it. You could also do a full coulomb counter like laptops do to really accurately measure charge level and the condition of the battery to find out when it's time to replace. None of this stuff is expensive in the modern digital world, but RV designers still think in 80s technology, I surmise.
It's also common to find just one 12v jack in an RV and at most 2, usually where TVs will go. They assume RV owners will not be using much 12v equipment even though it's quite common nowadays.
In order to protect the batteries when camping off-grid, there should be timers or automatic shut-offs of lights if voltage goes below certain limits. Many an RV camper has left a light on and found their battery drained. If they are there and the timer trips, they can just manually turn it on again.