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741 Photovore?

Does anyone know of a photovore made with some Cds Cells (light dependent Resistors) and a 741 Op-Amp? I have been looking for one, but have been unable to find them.

A photovore is a small robot that goes towards the britest spots ( look up Lm386 Herbie)

rickharris5 years ago
http://goavr.blogspot.co.uk/p/light-controlled-robot.html

http://www.rachelselectronics.com/2010/04/ac-coupling-wtf/

Do you understand how the operational amp (741) works?

http://en.wikipedia.org/wiki/Operational_amplifier

The output is proportional to the DIFFERENCE between the inputs.

Therefore if you connect your LDR's to the inputs and make sure they have a narrow field of view by putting them in a tube, then the output will reflect the respective amount of light falling on each detector.

I suggest a bread board a hand full of resistors and some experimentation is called for here.

Note the 741 supply should be +/-