hey the barrier is wooden plank . but the prblem is that when the barrier is away more than 3 cm it shopuldnt detect. well there is a way of adjusting that using pot but that doesnt work for changing ambient light. both the detector and transmitter will be fixed on same plane
"David D. Rea" wrote:
"David D. Rea" wrote:
What is the barrier material? If it is metallic, a simple damped LC tank
circuit could easily handle <=3cm detection.
DDR
On Wed, 2004-12-22 at 04:57, rajesh parwani wrote:
> hi friends,
> im searching for the sensors which can detect barrier
> at a distance of upto 3 cm and not more . well my working
> condition have lot of ambient light . i would prefer to fix the
> setting once for any lighting so that need not change it from place to
> place. please suggest me some way . should i go for ultrasonic sensor
> or the normal opto. if possible send me some circuit
>
> regards,
> rajesh
>
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