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pulsating LED dimmer?

 
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arvo
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Joined: 10 Oct 2007
Posts: 9

PostPosted: Wed Oct 10, 2007 6:24 pm    Post subject: pulsating LED dimmer? Reply with quote

Hey! I'flipped through this forum for hours now, I love it! I just started with electronics and want to make some projects...
But I need some help...

The first project is som device that can make one or more LEDS, perhaps two colours, to pulse in a very slow manner...
I find it kinda difficult to explain but bare with me...

I want the LEDs to go from almost off to very bright and back, and loop that sequence. And I want this to be done very slow, perhaps a sewuence could be 1 minute... I don't want any flicker and visual noise... just nice and smooth fading.... When I got this right I want to add another colour to fade as well....

Hope you understand my idea,
Have you got any clue on how to make this happen??

I just invested in a PIC-Programmer (velleman 8076) if that helps....

could you perhaps help with explaining how to program this kind of sequence if I have to use a PIC.... Smile

perhaps a simple diagram? Smile

thank you in advance, Arvid.
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Turd
HG Ruler


Joined: 18 Aug 2007
Posts: 274
Location: Saskatchewan, Canada

PostPosted: Wed Oct 10, 2007 7:29 pm    Post subject: Reply with quote

Theres a simple circuit on this page that should do the trick Very Happy

The only microcontrollers that I know how to use are PICAXE microcontrollers.


eric
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arvo
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Joined: 10 Oct 2007
Posts: 9

PostPosted: Thu Oct 11, 2007 3:46 am    Post subject: Reply with quote

hmmm, That seems to be what I need but a 22μF Capacitator?(!) I could almost pay somebody to sit there and change a voltage regualtor instead.. Smile

thanx for your help, but I'd love to get a little cheaper sollution...
/arvid
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Reverend Jones
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Joined: 15 Aug 2007
Posts: 39
Location: Jonestown, Guyana

PostPosted: Thu Oct 11, 2007 9:59 am    Post subject: Reply with quote

arvo wrote:
hmmm, That seems to be what I need but a 22μF Capacitator?(!) I could almost pay somebody to sit there and change a voltage regualtor instead.. Smile


22μF 10v ceramic capacitors 3/$1.00 USA
I realize that not everybody can afford to waste a dollar for 3 capacitors. Perhaps you could rob some old electronics for parts. I hear that trash cans/dust bins are a good source of old electronics.
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arvo
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Joined: 10 Oct 2007
Posts: 9

PostPosted: Thu Oct 11, 2007 11:22 am    Post subject: Reply with quote

Very Happy

yea, I just realised.... the search sytem for my elektronics store was kinda weird... I could only find capacitators for about 10$ each... at 22uF...
I triead again and found that I probably looked at really acurate capacitators...

so there we go, I'll order the parts and try that glowing eyes thing... Smile


btw, the transistors used in most schimatics I find on the net are out of date here in Sweden, but I don't know that much about electronics (obviously) to know what to do...

how do I know which transistors I can use instead? do I have to do anything else than changing the transistor? like, do I have to add a component to match the original diagram? like a resistor or so..?

thak you for you help!
/arvid
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Alan
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Joined: 29 Jan 2006
Posts: 1399
Location: Winnipeg, MB

PostPosted: Thu Oct 11, 2007 11:27 am    Post subject: Reply with quote

Welcome Arvo,

Have a look at this article
http://hackedgadgets.com/2006/11/27/pic-based-serial-controlled-rgb-led-pwm-driver/

It does way more than you need but the fade code should work for you, or at least give you a good idea of what you need. Look into taking some of your old electronic components apart for spare parts instead of tossing them in the trash, you will find lots of valuable things that way.
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arvo
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Joined: 10 Oct 2007
Posts: 9

PostPosted: Thu Oct 11, 2007 11:48 am    Post subject: Reply with quote

hey Alan! thanx for the link, I'll try to understand it all, it seams very educational . I tried to make the pyramid mood lamp, but failed, so I decided to try something I rather remake if I fail.. Smile
I don't want the RGB sollution though, only one or two colours, like blue and white...

Perhaps we wrote our post at the same time, but if you can help me with the transistor problem I've got (post above), I'd be really thankful!

thanx again! /arvid
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Reverend Jones
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Joined: 15 Aug 2007
Posts: 39
Location: Jonestown, Guyana

PostPosted: Thu Oct 11, 2007 1:52 pm    Post subject: Reply with quote

arvo wrote:
btw, the transistors used in most schimatics I find on the net are out of date here in Sweden, but I don't know that much about electronics (obviously) to know what to do...

how do I know which transistors I can use instead? do I have to do anything else than changing the transistor? like, do I have to add a component to match the original diagram? like a resistor or so..?


HERE is an online Transistor Cross Reference.

Elfa lists both the 2N3904 and 2N3906 under Discrete semiconductors>Transistors>Small signal transistors.

2N3904 is part #71-009-44
2N3906 is part #71-009-69
22μf capacitor is part #65-202-90
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arvo
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Joined: 10 Oct 2007
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PostPosted: Thu Oct 11, 2007 4:03 pm    Post subject: Reply with quote

hey! thanx a lot! Smile
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arvo
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Joined: 10 Oct 2007
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PostPosted: Sun Oct 14, 2007 4:13 pm    Post subject: Reply with quote

hey again!

I'm having trouble with that fading "devils eyes" thing... ( http://ourworld.compuserve.com/homepages/Bill_Bowden/page5.htm#eyes.gif ) I can't make it work... It just lights the LEDs up and nothing is fading.. Sad
I can't seem to find what could be wrong with the diagram, could somebody please help?
thanx in advance.
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Turd
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Joined: 18 Aug 2007
Posts: 274
Location: Saskatchewan, Canada

PostPosted: Sun Oct 14, 2007 5:29 pm    Post subject: Reply with quote

Check to see if the transistor is wired right.
The transistor is used in an abnormal way in this circuit.


eric
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arvo
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Joined: 10 Oct 2007
Posts: 9

PostPosted: Mon Oct 15, 2007 8:34 am    Post subject: Reply with quote

yea, the circuit seems very wierd...
but I think I've got it right... I'm using a BC549 though: ( http://w3.id.tue.nl/fileadmin/id/objects/E-Atelier/doc/Datasheets/Transistoren/BC549_550_4.pdf )

I've connected the emitter to the 100ohm resistor and collector to the +9v and Base to PIN 1 on the LM1458N...
I've got a capacitator at 22uF with the negative end ( - ) at PIN 2 on the LM1458N....
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arvo
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Joined: 10 Oct 2007
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PostPosted: Mon Oct 15, 2007 1:06 pm    Post subject: Reply with quote

yey! I got it to work! thanx all for your help!
/arvid
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Turd
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Joined: 18 Aug 2007
Posts: 274
Location: Saskatchewan, Canada

PostPosted: Mon Oct 15, 2007 1:21 pm    Post subject: Reply with quote

Good job Very Happy


eric
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Mon1018
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Joined: 24 Jun 2008
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PostPosted: Tue Jun 24, 2008 3:43 am    Post subject: Reply with quote

Great. I'm looking forward to this...
It sounds interesting. Let me have a try.
Good jop! Very Happy
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