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Help with LED combination to make a face. Answered

Hi,

     I am trying to make a face using LEDs.  I have attached an image of what I want to make.  Referring to the image the first set of Led will fade in one by one and then stays on while the next set of LEDs fade in one by one.  This will continue until all the sets for the mouth LEDs have been faded in.  Then the eyes, white LEDs in the outer and yellow LEDs in the center, both will fade in together.  After everything has been on for afew seconds then they will fade out in the reverse direction of fade in.  I would appreciate any help or suggestions as to how to tackle this project.  Thank you

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iceng

3 years ago

Do you want to do this withe a micro-processor or discreet logic ICs like the 555 and the 4017... ?

And what voltage do you plan to use ?

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pepelpue00iceng

Answer 3 years ago

By micro-processor, do you mean computer? If so, I would prefer discreet logic ICs, that way it is a stand alone system. As to the voltage, it would be 9 to 12v, since these would be ultra-bright LEDS. Thank you for your help.

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iceng

3 years ago

Here are the ways to sequence a set of LEDs using TO-92 SCRs from Jameco no slow light rise or fall with discreet logic. When you understand the simple third schematic we can work out how many IC it will take to do all the LEDs you want.

To rise and fall like you describe will take 4 times as many ICs.

http://www.jameco.com/webapp/wcs/stores/servlet/Pr...

SCRsimpSequence.gifSCRsequence.gifSCRSequ.gif
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pepelpue00iceng

Answer 3 years ago

Is that a relay attached to the collector on the 2N2222 transistor? As far as rise and fall, I can do away with that. Thank you

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icengpepelpue00

Answer 3 years ago

Yes it is the collector of the NPN transistor and the arrow pointing down and away is called the emitter.

EBC_TO-92.jpg
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pepelpue00iceng

Answer 3 years ago

Thank you but I was talking about the components attached to the collector. I indicated the components in question on the attached image. Thank you

question.jpg
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icengpepelpue00

Answer 3 years ago

Yes it is a relay with a 12 volt coil and uses the NC Normally Closed contacts.

There is also a 1N4001 diode across that coil to absorb dangerous voltage kick-back spikes to avoid damage to the ICs.

But if you want you could use a P-MOSFET instead.

http://www.jameco.com/webapp/wcs/stores/servlet/Pr...

SCRseqFET.gif
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pepelpue00iceng

Answer 3 years ago

Can this setup be made to come on at random intervals on its own. Thank you for all the schematics.