![]() When light falls on the LDR, the electrons in the valence band of the material are ready to move to the conduction band. A material’s conductivity increases when light is absorbed by it. LDRs work based on photoconductivity, which is an optical phenomenon. Working Principle of Light Dependent Resistor This LDR circuit is based on the LDR’s working and is quite simple. To use it as a dark detector alarm, we can also use a buzzer or speaker instead of LEDs. If the circuit fails to detect light, it triggers the IC and illuminates the LED attached to it. A copy of the license is included in the section entitled GNU Free Documentation License.In this circuit, we have demonstrated a Dark/Light Detector using a LM741 Op-Amp and LDR (Light Dependent Resistor). Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.2 or any later version published by the Free Software Foundation with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. CC BY-SA 3.0 Creative Commons Attribution-Share Alike 3.0 true true share alike – If you remix, transform, or build upon the material, you must distribute your contributions under the same or compatible license as the original.You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use. ![]() attribution – You must give appropriate credit, provide a link to the license, and indicate if changes were made.to share – to copy, distribute and transmit the work.
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