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LCD based digital alarm clock using 89S51 MC*Circuits Mania

LCD based digital alarm clock using 89S51 MC*Circuits Mania | Embedded projects | Scoop.it
LCD based digital alarm clock using 89S51 MicroController   Circuit Diagram An alarm clock is a clock that indicates a pre-set time by producing sound at that time.
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Multidoor Cordless Alarm*Circuits Mania

Multidoor Cordless Alarm*Circuits Mania | Embedded projects | Scoop.it
Thwart the attempt of burglary by detecting intrusion with this alarm circuit. Each door is protected by a separate circuit built around an independent 555 timer IC in conjunction with reed switch magnet.
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Alcohol Breathalyzer circuit using 8051 microcontroller (AT89S51).*Circuits Mania

Alcohol Breathalyzer circuit using 8051 microcontroller (AT89S51).*Circuits Mania | Embedded projects | Scoop.it
This article is about a breathalyzer circuit using 8051 microcontroller which outputs the blood alcohol content (BAC) from the breath. The BAC is displayed in percentage on a 3 digit seven segment display.
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