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pasicr
Joined: 13 Aug 2005
Posts: 295
Helped: 9
Location: Macedonia
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 15 Oct 2009 8:53 For LED experiences college |
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Hi for all, I need advice from college with experiences in led driving, I have 50 led in series and I need driver with pic micro for example, also I need to light only 3 or 4 leds in same time and this will be shifted, to get moving athom effect in elipse...
regards
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nandhu015
Joined: 11 Feb 2006
Posts: 647
Helped: 47
Location: Tamilnadu, India
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15 Oct 2009 9:56 Re: For LED experiences college |
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| Quote: |
| I have 50 led in series |
If you had connected led in series,
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| I need to light only 3 or 4 leds in same time |
cant do this
Nandhu
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pasicr
Joined: 13 Aug 2005
Posts: 295
Helped: 9
Location: Macedonia
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15 Oct 2009 12:53 Re: For LED experiences college |
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I send three logic 1 and nothing else, only clock and shift with shift register...
regards
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nandhu015
Joined: 11 Feb 2006
Posts: 647
Helped: 47
Location: Tamilnadu, India
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15 Oct 2009 13:23 For LED experiences college |
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Can you post the circuit so that we can help you
Nandhu
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pranam77
Joined: 22 Apr 2008
Posts: 1079
Helped: 102
Location: Mangalore(India)
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15 Oct 2009 13:57 Re: For LED experiences college |
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Instead of using PIC micro for such simple design, Just go ahead with a 10 channel chaser design with 555 and CD4017 and connect 5 led's per channel. You can also decrease the channel outputs by connecting the reset pin 15 to respective outputs where you want the count to reset. Have a look at the 10 channel LED chaser in the given link below. Cheers
http://www.qrp.pops.net/LEDs.asp
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sahu
Joined: 09 Oct 2009
Posts: 43
Helped: 3
Location: india
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15 Oct 2009 16:49 Re: For LED experiences college |
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| pasicr wrote: |
Hi for all, I need advice from college with experiences in led driving, I have 50 led in series and I need driver with pic micro for example, also I need to light only 3 or 4 leds in same time and this will be shifted, to get moving athom effect in elipse...
regards |
i hope its help u.
injoy with it
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kender
Joined: 19 Jun 2005
Posts: 1234
Helped: 88
Location: Stanford, SF Bay Peninsula, California, Earth, Solar System, Milky Way
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20 Oct 2009 21:32 Re: For LED experiences college |
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| pasicr wrote: |
| I have 50 led in series [...] I need to light only 3 or 4 leds in same time and this will be shifted [...] |
Which of the following scenarion do you want to acheive ?
- light 1,2,3,4 then 2,3,4,5 then 3,4,5,6 etc
- light 1,2,3,4 then 5,6,7,8 then 9,10,11,12 etc
Another question - how much current do you need to drive?
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pasicr
Joined: 13 Aug 2005
Posts: 295
Helped: 9
Location: Macedonia
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20 Oct 2009 22:03 Re: For LED experiences college |
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scenario light 1,2,3,4 then 2,3,4,5 then 3,4,5,6 etc
I use red 5mm led...
regards
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Google
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20 Oct 2009 22:03 Ads |
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kender
Joined: 19 Jun 2005
Posts: 1234
Helped: 88
Location: Stanford, SF Bay Peninsula, California, Earth, Solar System, Milky Way
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20 Oct 2009 22:33 Re: For LED experiences college |
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| pasicr wrote: |
scenario light 1,2,3,4 then 2,3,4,5 then 3,4,5,6 etc
I use red 5mm led... |
In this scenario, essentially, you need individual drive for each LED. I would recommend common anode* for all 50 LEDs instead of connecting them in series. Cathodes connected to a shift registers. I don't have the part number for the shift register on the top of my head. But I'm sure folks here can suggest specific parts.
- Nick
* Common cathode could work as well. I'll stick with common anode for certainty.
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JARI NETWORKS
Joined: 04 Nov 2009
Posts: 1
Location: Hedalen, Norge
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04 Nov 2009 14:58 Re: For LED experiences college |
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| you can also try to put it in a matrix
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