Measurements and calculations complete table below v

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Unformatted text preview: e switch is closed, there would be a lot of false alarms. On the other hand, once the alarm is on, it should stay on for some time after the motion stops and the switch opens, to encourage the bad guys to leave. In this design, the manual switch will simulate the motion sensor. (A real motion sensor would probably make intermittent contact while moving, while the manual switch will stay open or closed when switched, so the manual switch is an approximation.) Most switch ­type sensors are single throw, that is, they are either open or closed, rather than having two contacts like the manual switch in the lab kit. That's because SPST is cheaper than SPDT. You can use the lab kit SPDT switch as an SPST switch by not connecting one of the contacts. The part of car alarm, will be played by a comparator circuit (Figure P3 ­1). A comparator compares two voltages (hence the name). If the first voltage is higher than the second, the comparator output saturates high, near +Vcc. If the second voltage is higher than the first...
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This note was uploaded on 11/12/2012 for the course EE 215 taught by Professor Davis during the Spring '12 term at University of West Georgia.

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