How can i obtain 5V and 0V output from LDR??

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#1 21671977 18 Jul 2014 23:37

jay reyes jay reyes

Anonymous

Post #1
21671977 18 Jul 2014 23:37

How can i obtain 5V and 0V output from LDR??or make it DIGITAL OUTPUT??. please give advice.. tnx
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#2 21671978 18 Jul 2014 23:58

John Schmitz John Schmitz

Anonymous

Post #2
21671978 18 Jul 2014 23:58

I don't understand what you are asking?
Do you want a logic level output or a regulated output?
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#3 21671979 06 Aug 2014 12:23

Syed Shadab Syed Shadab

Anonymous

Post #3
21671979 06 Aug 2014 12:23

yes you can use a simple transistor to do your job. connect the LDR along with a potentiometer at the base of a transistor (refer image attached). potentiometer you need to adjust the trigger point based on light intensity.
Resistor connected at base must be 10 times greater than resistor at collector to operate transistor as a switch this is a rule of the thumb. I have uploaded image please refer to it.
#4 21671980 06 Aug 2014 12:45

John Schmitz John Schmitz

Anonymous

Post #4
21671980 06 Aug 2014 12:45

LDR - I thought you meant low dropout regulator. I you mean a photo sensor, use a SFH5140, it has everything you need.
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How can i obtain 5V and 0V output from LDR??

How can i obtain 5V and 0V output from LDR??

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