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Shubham Tiwari, profile picture
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Automatic light sensor system ( s p project)

1) The document describes an automatic light sensor system created by students to save electricity. 2) The system uses an LDR sensor, IC NE555 circuit, and resistances on a PCB to automatically turn lights on when it gets dark and off again when another light source is detected, needing no manual operation. 3) The components used include an LDR light sensor, NE555 IC, LED, resistances, PCB board, and the system could be applied to street lights, home appliances, or inverters.

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Automatic Light Sensor System Submitted By : Submitted To : Shubham Tiwari (2011ecs35) Manish Singh (2011ecs34) Rajesh Pathak (2011ecs42) Ahmed Raza (2011ecs35) Dr. Ajay Kaul
Why This Project ????? Save Electricity
Project Description We are using LDR,IC NE555 and some resistances on a PCB. When darkness rises to a certain value above LDR then sensor circuit gets activated and switch is ON and when there is other source of light then switch gets OFF. For High power switching one can connect Relay (electromagnetic switch) at the output of pin 3 of I.C 555. Needs no manual operation for switching ON and OFF.
Component Used : 1: 2: 3: 4: 5: 6: 7: 8: 5v Battery using Nokia Charger Switch L.D.R (Light Depending Resistance) I.C NE555 with Base L.E.D (Light Emitting Diode) Resistance 10k P.C.B (Printed Circuit Board of 555 or Vero board. BJT
Basic Ckt. Diagram
Applications In Street Lights In Home Appliances using relay cicuit. In Invertor as a switch.
Automatic light sensor system ( s p project)