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Password Based Circuit Breaker

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Password Based Circuit Breaker Contents  1  Block Diagram: 2  Principle: 3  Circuit Diagram: 4  Circuit Design: 5  Algorithm: 6  Simulation Video: 7  How to Operate? 8  Download Project Code 9  Output Video: 10  Advantages: 11  Applications: 12  Related Articles Now/recently ,  electrical   (sudden unplanned bad events/crashes)   to   the   line   man   are   increasing , while   repairing   the   electrical   lines   due   to   the   lack   of   communication   between   the   electrical substation   and   maintenance   staff .  This   project   gives   a   solution   to   this   problem   to   secure/make sure of   line   man   safety . In   this   proposed   system   the   control ...
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8 Channel Quiz Buzzer Circuit using Microcontroller

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8 Channel Quiz Buzzer Circuit using Microcontroller Quiz buzzers are used often at places like educational institutions where it is required for game shows. Conventional systems require human intervention to decide which team has pressed the button and this system can be erroneous and even biased. Another problem arises when two members pressed the button at a negligible interval and it is difficult to guess who has pressed the buzzer first. Here we designed an automatic quiz buzzer system such that when more than one team presses the buzzer, the delay is accurately taken into account and number is displayed. We build the circuit using a microcontroller which scans the input from push buttons and displays the corresponding number on a display device.  It is a simple circuit with minimum number of components and sans any complexities. The microcontroller takes into account the time delay between two buttons and the accurate number is displayed.  Even though this system is ...
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Air flow detector circuit

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Air flow detector circuit Description. This circuit can give a visual indication of the rate of air flow.It can be also used to check whether there is air flow in a given space. The filament of a incandescent bulb is the sensing part of the circuit.When there is no air flow the resistance of the filament will be low.When there is air flow the resistance drops , because the moving air will remove some of the heat generated in the filament.This variations in the resistance will produce variation of voltage across the filament.These variations will be picked up by the opamp (LM339) and the brightness of the LED at its output will be varied proportionally to the airflow. Circuit diagram with Parts list. Notes. The filament L1 can be made by removing  the glass of a 40W incandescent bulb. The circuit can be powered from a 12 V DC power supply.
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