earckens
Junior Member level 2
Purpose of this design: detect light variation at low intervals (>1 second, up to minutes).
This detection circuit works independent of ambient light.
What I do need is a delay on the output, only when LDR is uncovered, ie when the voltage on the non-inverting input recovers to a high level.
The left design uses two comparators and works well. I would however like to reduce this to a design with one comparator only, if possible.
I am in a bind how to introduce a delay circuit for the voltage on pin 9 (non-inverting): voltage going up on that pin needs to be delayed.
This detection circuit works independent of ambient light.
What I do need is a delay on the output, only when LDR is uncovered, ie when the voltage on the non-inverting input recovers to a high level.
The left design uses two comparators and works well. I would however like to reduce this to a design with one comparator only, if possible.
I am in a bind how to introduce a delay circuit for the voltage on pin 9 (non-inverting): voltage going up on that pin needs to be delayed.