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Interactive LED Circuit

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slwthr

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I saw lot of Interactive LED designs and tables made with that design.

LED's activate for the any object moving through the IR beam(IR sender/Receiver) then LED's get lighted like fade in effect and when thres no object Led's slowly off like fade out effect and ripple effect.

I really need to build that circuit and use it for the table.

Is there any Circuit for Interactive LED design?
 

I think you need 3 devices looking into the same direction:
  • an IR LED sending the beam
  • an (only) IR-sensing photodiode/transistor
  • a visible LED
... and some simple logic which switches the LED. Fading can be realized by constant current and a large capacitor, I'd think.
 

You will need to have a slow rise and slow fall to illustrate fading in and fade out of the LED.
This also requires a trigger to start the slow charge buildup.
As such you need to detect a beam interrupt ,,trigger a 555 in monoshot mode to charge a big tank capacitor .
The mono remains ON for the retention period by which time the charging pulse dies off.
The LED discharges the charged capacitor very slowly to swich off.and fade out
 

You correct.I have some design of circuit.Its working well.And also Activate the LED's when I move any object or hand on the IR LED and IR photodiode.But I don't know how to make the LED's fade in/out switching.Or if the hand on sensor for some time I want to blink those LED's like,when Object soo close with the sensor LED's are so bright and when object moving out from the sensor LED's get slowly fade out.

I will post a Circuit and please If you can do this effect for this circuit tell me how to do.

 

Re. fading: I'd try a ≈50F GoldCap® or a tiny 2.4V NiMH accu in parallel to the green marked (visible) LEDs.
 

what is that "tiny 2.4V NiMH accu" ? and I will try using capacitor..

actually this is what I want to make.Check this video.You will get some idea.


If you have any new idea let me know..I think this is use PWM for LED effects.
 

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