Changing small PIR light

[Blisk]

I have this small LED and PIR light now when sensor detect motion it turns ON and after 2 minutes it turns OFF.
Now I like to change circuit to Light turn of slowly, like dimm to zero, so it takes about 20 seconds to light turn of by dimming.
But don't know how.
here is circuit
**broken link removed**

 

[betwixt]

The BISS0001 only has an on/off output control so you can't modify it directly, you will have to add extra circuitry that ramps the LED current up and down instead of just turning it on and off. We need to know the LED rating to advise on how to do this.

Brian.

 

[Blisk]

Hi
Don't know what do you mean with LED ratings.
There are 3 white LEDs 5mm. Lamp use 3batteries 1.5V