Bill, And if google gives too many hits, also try eBay: LED segment bar graph For $10 and up you get beautiful, almost irresistible hits like:
http://www.ebay.com/itm/160986263849 http://www.ebay.com/itm/160996095451 http://www.ebay.com/itm/151007627810 http://www.ebay.com/itm/160996948941 http://www.ebay.com/itm/160996949241 /tvb ----- Original Message ----- From: "Tom Van Baak" <[email protected]> To: "Discussion of precise time and frequency measurement" <[email protected]> Sent: Monday, April 01, 2013 4:45 PM Subject: Re: [time-nuts] Time shown as two horizontal bars > Hi Bill, > > Before you go digital consider a retro solution -- use two loops of 1/4 inch > tape (as in magnetic recording tape, or even dymo label tape). Put a tension > pulley on one end and a small stepper drive on the other. Step at the > appropriate rotation rate to create the desired snail's pace linear velocity. > You can imprint numbers or just a color line on the tape. Sort of like a > strip-chart flip-clock. > > If you use LEDs it might be easier to use a collection of LED bars (as in the > .1x10 in DIP package). Google for LED bar graph. For driving, look at the > MAX7219 if you want far fewer wires (and your eyes can tolerate multiplexed > LED's). Finally, see http://www.primeled.com/ > > /tvb > > ----- Original Message ----- > From: "Bill Hawkins" <[email protected]> > To: "'Discussion of precise time and frequency measurement'" > <[email protected]> > Sent: Monday, April 01, 2013 3:06 PM > Subject: [time-nuts] Time shown as two horizontal bars > > >> 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 -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
