Click To View Circuit Diagram
Smart Laptop Security Station
If someone tries to lift your laptop from the docking station, Then it will give you an alarm by audio and visual means to indicate that some one has stolen your laptop. Build this kit and prevent laptop theft.
Things which you can learn:
*Application of CD4060 as binary counter.
*Applicaion of opto sensor CYN70.
*Use of transistors as signal amplifiers.
*Implementation of the Bridge rectifier circuit for AC to DC conversions.
Convert your ordinary docking station to smart docking station with this laptop security station kit. Laptops are very expensive and to prevent theft of it, employ this circuit and get informed whenever someone tries to steal your laptop.
Circuit is built around IC CNY70 (IC1) and IC CD4060 (IC2).
IC CNY70 is an integrated reflective type opto-sensor that contains a phototransistor and an infrared LED. The LED emits infrared light and the transistor works as a receiver. The current flowing through the phototransistor depends on the intensity of the light detected.
IC CD4060 is a 14-stage ripple-carry binary counter. The counter is reset to zero by a gating positive voltage at the reset input independent of clock.
When the laptop is in the docking station, the phototransistor inside IC1 receives the IR light from the LED, reflected by the laptop surface. The phototransistor conducts to make
reset pin 12 of IC2 high, so IC2 does not oscillate.
When someone lifts up the laptop from the docking station, the phototransistor cuts off and pin 12 of IC2 goes low. As a result, IC2 starts oscillating. After a few seconds, delay pin 3 of IC2 goes high to drive transistor T1. The piezo buzzer starts beeping to raise an alert and the LED2 glows to indicate that someone has stolen the laptop from the dockyard.