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pasicr
Joined: 13 Aug 2005
Posts: 249
Helped: 6
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 08 Apr 2008 21:25 Large LED CLOCK display |
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Hi,
I need info or link for made 24 cm high led clock display, with time, date and temperature show,
something like led display used on gas station, for example,
regards
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baron88
Joined: 22 Mar 2008
Posts: 4
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| 11 Apr 2008 17:29 Re: Large LED CLOCK display |
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I think this is part from what you want (clock).
Please find attached
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pasicr
Joined: 13 Aug 2005
Posts: 249
Helped: 6
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| 12 Apr 2008 2:33 Re: Large LED CLOCK display |
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Hi Baron,
thanks for info, but I need good working projects for clock and temperature show like this:
regards
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baron88
Joined: 22 Mar 2008
Posts: 4
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| 13 Apr 2008 0:21 Re: Large LED CLOCK display |
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Pasicr in the attached temperature measuring circuit .I don't know if it help .
Best Regards
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pasicr
Joined: 13 Aug 2005
Posts: 249
Helped: 6
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| 15 Apr 2008 3:13 Re: Large LED CLOCK display |
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Hi for all,
can somebody suggest me how can I connect (between) this led's 5 mm red diode's (picture show diode arrangement for one segment in 7 segment display),
If someone have a experience with led constant current driver, divide with me,
regards
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blueroomelectronics
Joined: 17 Sep 2006
Posts: 1141
Helped: 56
Location: Toronto, Canada
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| 15 Apr 2008 15:34 Large LED CLOCK display |
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You don't need constant current, just use the same number of LEDs per segment.
You've got 26 LEDs so you'll need 2x13 rows (or carefully do the math for different combinations)
So 1.8V * 13 = 23V per set + 0.7V drops if you use bipolar drivers + some overhead for the resistor, lets say 2.3V so 26V supply will need a 150ohm resistor (this will give each LED about 15ma so nice and bright)
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kosta
Joined: 25 Jan 2002
Posts: 37
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| 01 May 2008 9:38 Re: Large LED CLOCK display |
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250 and 500mm Large LED dispay:
http://www.elcom.co.yu/led_7seg.htm
Last edited by kosta on 01 May 2008 20:47; edited 1 time in total |
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Sayem Ahmed
Joined: 07 Apr 2008
Posts: 48
Helped: 3
Location: Dhaka,Bangladesh
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| 01 May 2008 10:17 Re: Large LED CLOCK display |
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<<<>>><<<>>><<<>>><<<>>><<<>>><<<>>><<<>>>
Now I add all my hobby project about clock for your help
================ENJOY THIS==================
<<<>>><<<>>><<<>>><<<>>><<<>>><<<>>><<<>>>
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blueroomelectronics
Joined: 17 Sep 2006
Posts: 1141
Helped: 56
Location: Toronto, Canada
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| 01 May 2008 19:21 Large LED CLOCK display |
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That MAX7219 is a very nice but not cheap part, also may be hard to source for some.
It's SPI or (Microwire MAX7221) and does most of the work for you.
It's only for simple LED display (less than 3V LEDs) and cannot drive a large HV LED display.
http://www.maxim-ic.com/quick_view2.cfm/qv_pk/1339
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eng.love
Joined: 06 May 2008
Posts: 1
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| 06 May 2008 17:01 Large LED CLOCK display |
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| Thnaks for all
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husni132
Joined: 10 Apr 2008
Posts: 6
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| 08 May 2008 5:37 Re: Large LED CLOCK display |
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soory, can u help me making scoringboard?
I don't have an idea, I'm a newbie
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DE2IS
Joined: 10 Jan 2008
Posts: 10
Helped: 1
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| 22 May 2008 18:29 Re: Large LED CLOCK display |
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| Thanks a lot guys i needed one of these.
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tvthang
Joined: 17 May 2008
Posts: 46
Helped: 5
Location: Ho Chi Minh city, VietNam
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| 23 May 2008 4:56 Re: Large LED CLOCK display |
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This is an example for you:
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