Thursday 13 September 2012

SELF RESETING INTRUDER ALARM

This project has unique facility by which it automatically shuts OFF after sounding an alarm for about 10 seconds. IC 555 has been used with in stable mode. As long as light continues to fall on the LDR IC pin no.2 continues receiving positive volts and the output remains  zero. As soon as the light falling on the LDR is interrupted then the pin no.2 gets negative pulses and the IC works for 10 seconds. After this the circuit is automatically reset.

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