RE: [AVR-Chat] Time sources in Australia
2006-06-15 by John Samperi
Back on the list!! At 05:47 PM 15/06/2006, you wrote: >make sure you pick the beam angles of the >LED's you use for the display very carefully. Don't know the angle yet. I'm looking at a pre built 7 segment block. It has some 90 leds each segment but I will need to find that out. >20 degrees is a lot narrower than >you think, and you could hardly see it unless you were dead in line. I did some work on led traffic lanterns in the past and I understand that, however some of the optical engineers that were specifying the leds would go down to 7.5 deg!! so that they could get the brightness. That was quite a while ago and leds have come a long way now. >My sign has an RS485 link to the manager's PC inside the building where >he can correct the time. It uses a Philips PCF8583 real time clock That is one of the options I was thinking of. I'm using a Dallas DS1305 with the DS32KHz precision clock driver. >It does daylight saving adjustments >automatically (add 1 hour at 1am on last Sunday in March, back 1 hour at >2am on last Sunday in October). It would have to be programmable as some states don't have it at all and others may start/stop at different dates i.e. Tasmania starts 1st Sunday of October, QLD doesn't believe in it, NSW last Sunday of October etc :-( Regards John Samperi ******************************************************** Ampertronics Pty. Ltd. 11 Brokenwood Place Baulkham Hills, NSW 2153 AUSTRALIA Tel. (02) 9674-6495 Fax (02) 9674-8745 Email: john@ampertronics.com.au Website http://www.ampertronics.com.au *Electronic Design * Custom Products * Contract Assembly ********************************************************