Re: [time-nuts] Time shown as two horizontal bars
So all you need is one spinning mirror and two laser pointers side by each? one track for hours and one for minutes. Don Chris Albertson I still like my laser pointer design. I've been thinking about it and the parts count is lower than I first thought. Here is how it works Aim a laser pointer as a spinning hexagonal scanner mirror. These look like the head of a large size bolt, but with mirrored sides. The moter turns the mirror and there is a contact switch that closes once per face or six times per revolution. The contact swich interrupts an Arduino. Then inside the interrupt the software toggle sthe power to the laser. The delays between the interrupt and toggle depend on the time of day. So all you need is the spinning scanner assembly, a laser pointer a transistor to drive it and one Arduino. The size of the display can be adjusted by changing the delay between the toggles and it can be a front or rear projection system. Unlike the fixed LEDS my projecter can have moving dots. Maybe they can look lie a metronome and count off seconds. Or the dot can crawl across the screen.Or you couldspell the numbers on mose code with dots and dashes. Or you make it change the presentation every day and confuse people On Mon, Apr 1, 2013 at 3:38 PM, WB6BNQ wb6...@cox.net wrote: Hi Bill, Interesting idea. One of the problems you are going to have with normal available displays is being able to distinguishing the individual elements as you get further away from the clock. So it sounds like you may have to construct your own display area so that the elements are further apart. Doing so would allow for some embellishments, such as using a different colors for the 10 and 30 minute LEDs. Equally so, you could use 24 LEDs for hour marks using two different colors for day and night. Likewise, you could reduce the number of LEDs by using 9 for the minutes in one row. A second row would have 5 for the 10 minute marks. The third row would be the hours with just the 12 LEDs but by using dual color LEDs you could cover day and night. Just thought I would complicate your project BillWB6BNQ Bill Hawkins wrote: Looking for a long, thin horizontal clock display for use above or below a flat screen TV. Tried searching for bar clock and got a lot of useless hits. What I'd like is a display that is about half an inch (12 mm) high by 12-18 inches long (30-50 cm) that is just two rows of 60 or 120 leds. One row is labeled 0 to 59 (or 60) and the other is labeled 0 to 12. The display does not stay at 12 or 60 but jumps back to zero. Power line frequency is an adequate reference, as long as it always has the same 86,400 seconds per day, except for added leap seconds. There should not be a clock frequency adjustment. 60 seconds worth of line cycles bumps the minute bar (30 if it has 120 leds), and 5 minutes bumps the hour bar (150 seconds for 120 leds). The clock is set (after startup and power outages) by four buttons on the back - minutes, increment, decrement, hours. Have any of you connoisseurs of time seen such a clock? How about a bar of leds that could be used to make a clock? Bill Hawkins P.S. Currently re-reading Terry Pratchett's Thief of Time - a whole new way to look at time in a funny and perceptive story. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. -- Chris Albertson Redondo Beach, California ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. -- Neither the voice of authority nor the weight of reason and argument are as significant as experiment, for thence comes quiet to the mind. De Erroribus Medicorum, R. Bacon, 13th century. If you don't know what it is, don't poke it. Ghost in the Shell Dr. Don Latham AJ7LL Six Mile Systems LLP 17850 Six Mile Road POB 134 Huson, MT, 59846 VOX 406-626-4304 www.lightningforensics.com www.sixmilesystems.com ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Time shown as two horizontal bars
On Tue, Apr 2, 2013 at 1:42 AM, Don Latham d...@montana.com wrote: So all you need is one spinning mirror and two laser pointers side by each? one track for hours and one for minutes. No, Just one laser pointer. It you want two dots you turn it one twice per scan. If you want 100 dots you turn in one 100 times per scan. Feed constant DC current to the laser and you get a solid line all the way across. So basically you turn if off when you don't that part of the line to show. Laser printers do the exact same thing but with much greater precision. You think of this like a CRT tube but with a laser rather then an electron beam. You can draw just about anything on a CRT. The trick is to keep the beam modulation in sync with the scan mirror the scan motor will make a pulse you can use for that. -- Chris Albertson Redondo Beach, California ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Time shown as two horizontal bars
Got that, but i think two separate lines were required, one for hours and one for minutes? Don Chris Albertson On Tue, Apr 2, 2013 at 1:42 AM, Don Latham d...@montana.com wrote: So all you need is one spinning mirror and two laser pointers side by each? one track for hours and one for minutes. No, Just one laser pointer. It you want two dots you turn it one twice per scan. If you want 100 dots you turn in one 100 times per scan. Feed constant DC current to the laser and you get a solid line all the way across. So basically you turn if off when you don't that part of the line to show. Laser printers do the exact same thing but with much greater precision. You think of this like a CRT tube but with a laser rather then an electron beam. You can draw just about anything on a CRT. The trick is to keep the beam modulation in sync with the scan mirror the scan motor will make a pulse you can use for that. -- Chris Albertson Redondo Beach, California ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. -- Neither the voice of authority nor the weight of reason and argument are as significant as experiment, for thence comes quiet to the mind. De Erroribus Medicorum, R. Bacon, 13th century. If you don't know what it is, don't poke it. Ghost in the Shell Dr. Don Latham AJ7LL Six Mile Systems LLP 17850 Six Mile Road POB 134 Huson, MT, 59846 VOX 406-626-4304 www.lightningforensics.com www.sixmilesystems.com ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Time shown as two horizontal bars
On Tue, Apr 2, 2013 at 12:25 PM, Don Latham d...@montana.com wrote: Got that, but i think two separate lines were required, one for hours and one for minutes? Yes. If two lines are needed a second laser is likey cheaper than trying to rig a vertical scan mirror Put if all that is needed is a moving dot, A laser pointer glued to the shaft of a stepper motor would work and be even simpler. -- Chris Albertson Redondo Beach, California ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Time shown as two horizontal bars
Well, if you want to do it, I have 5 old Brush penmotors Don Chris Albertson On Tue, Apr 2, 2013 at 12:25 PM, Don Latham d...@montana.com wrote: Got that, but i think two separate lines were required, one for hours and one for minutes? Yes. If two lines are needed a second laser is likey cheaper than trying to rig a vertical scan mirror Put if all that is needed is a moving dot, A laser pointer glued to the shaft of a stepper motor would work and be even simpler. -- Chris Albertson Redondo Beach, California ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. -- Neither the voice of authority nor the weight of reason and argument are as significant as experiment, for thence comes quiet to the mind. De Erroribus Medicorum, R. Bacon, 13th century. If you don't know what it is, don't poke it. Ghost in the Shell Dr. Don Latham AJ7LL Six Mile Systems LLP 17850 Six Mile Road POB 134 Huson, MT, 59846 VOX 406-626-4304 www.lightningforensics.com www.sixmilesystems.com ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Time shown as two horizontal bars
One needs to think of better resolution here. How about a mirror galvanometer? http://www.ebay.com/itm/Leeds-Northrup-Mirror-Galvanometer-/121086073505?pt=LH_DefaultDomain_0hash=item1c314adaa1 http://www.ebay.com/itm/Cambridge-Technology-6810P-517-Moving-Magnet-Optical-Scanner-Galvanometer-/190766443040?pt=LH_DefaultDomain_0hash=item2c6a90ea20 Or, scrap an old hard drive and use the linear motor from the head servo. http://www.youtube.com/watch?v=qPX6Sfj8YKw Bob L. From: Chris Albertson albertson.ch...@gmail.com To: Discussion of precise time and frequency measurement time-nuts@febo.com Sent: Tue, April 2, 2013 3:54:23 PM Subject: Re: [time-nuts] Time shown as two horizontal bars ... if all that is needed is a moving dot, A laser pointer glued to the shaft of a stepper motor would work and be even simpler... ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Time shown as two horizontal bars
Hi: If I remember correctly this is to go above a wide screen TV. That means there's no space in front for a projector. It also means the light level needs to be fairly dim when the TV is being watched at night and fairly bright in the daytime (but the latter is of much less importance). The rectangular shaped individual LEDs or the 10 segment bar graph type would work. But some cleverness would be needed to make the time obivious and get the brightness correct. I have the Nixie Tube Four Letter Word GPS disciplined clock visible in my TV room and it often gets comments. http://www.prc68.com/I/timefreq.shtml#FLW When you see for underlines the characters displayed are HH:MM. Have Fun, Brooke Clarke http://www.PRC68.com http://www.end2partygovernment.com/2012Issues.html ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
