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.
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.