LDR circuit

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LDR circuit

Postby arivalagan13 » Sun Dec 23, 2012 10:00 pm

Hi
I want to use LDR in one of my circuits. But it is responding to daylight which it is not supposed to do so.
How can I solve this problem using circuit technique?

I provide the application scenario which might help to drive home my problem.
The circuit should work as follows:
I will be having a LDR in an robotic arm(arm 1).The LDR(robotic arm) is continously looking for another robotic arm(arm 2) to pass by its nearest vicinity.
As the second arm is close enough, arm 1 attaches to it.For this to happen we have electromagnetic coil in arm 1 and ferrite rod in arm 2. Based on the distance between arm 1 and arm 2 the coil will be energized

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Re: LDR circuit

Postby bobmarlowe » Mon Dec 24, 2012 1:37 am

You will have to build a band-pass filter that is able to sort out (pass) your desired signals and react on it. It should block 50-60 Hz signals from lamps, and slow changing daylight.

Bob
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Re: LDR circuit

Postby bobmarlowe » Mon Dec 24, 2012 1:39 am

Ah, I just remember to have built a movement detector using 2 LDRs and using the difference between both the signals.

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Re: LDR circuit

Postby arivalagan13 » Mon Dec 24, 2012 4:30 am

Thnx in the first place for reply..

Can you please elaborate on the band pass filter frequency response pertaining to this application?

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Re: LDR circuit

Postby bobmarlowe » Mon Dec 24, 2012 12:16 pm

I think you have to elaborate the specs for the filter yourself, since the mechanism shadowing the LDR is dependent on your machinery. Use a crt skpe and try to capture the pulse you want to react on and calculate its frequency.
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