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Step 1: Things that you will need
6)3 9v batteries
8)Two variable resistors of 10K
Please download the data sheet of LM358 and LM7805 IC.
Link of LM358- http://www.datasheetcatalog.com/datasheets_pdf/L/M/3/5/LM358.shtml
Link of LM7805- http://www.datasheetcatalog.com/datasheets_pdf/L/M/7/8/LM7805.shtml
Step 2: Circuit Diagram
Connect the first terminal of the LDR to positive and second terminal through variable resistor to negative.Then start varying and when you get a vary of example(.58 v to 1.1v).if the vary is of good range ,it will also work.then take a wire in between from LDR and variable resistor and put in the third pin of the LM358 IC.
Please make the circuit given in the diagram.
The circuit should be made in a good light.
Step 4: How it works
And when you put your hand on right LDR the 2nd led starts glowing.
IF you have any problems in this circuit you can comment or mail me at email@example.com.
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