specified sequence of digits‚ which is the correct code sequence to unlock the system. The circuit also contains (555) timer IC to lock automatically after certain period of time. Discussion Equipments Used * SPST switches. * CD4013 Dual-D flip-flop ICs. * 74LS147 Decimal to BCD Encoder. * 74LS47 BCD-to-7-Segment Decoder IC. * 7-Segment Display. * 555 timer IC. * Relay. * 12V DC Power Supply. Procedure The Digital Lock Circuit diagram shows that the nine SPST switches
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Visitor counting is simply a measurement of the visitor traffic entering and exiting offices‚ malls‚ sports venues‚ etc. Counting the visitors helps to maximize the efficiency and effectiveness of employees‚ floor area and sales potential of an organization .Visitor counting is not limited to the entry/exit point of a company but has a wide range of applications that provide information to management on the volume and flow of people throughout a location. A primary method for counting the visitors
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ELECTRONICS LOCK A Report of the project for the fulfillment of the requirement of NIRMAAN (Electronic Hardware Model Exhibition) Sankalp-2009 Submitted By PRAGNYASINI PANIGRAHI (EIE) 200860192 SIBANI SAIDARSANI (ECE) 200860316 ANKITA PANIGRAHI (EIE) 200810202 Organized By Electronics Hobby Club‚ NIST |[pic] |[pic]
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Alcohol breathalyzer circuit using 8051 microcontroller. Three digit display 1 of 9 http://www.circuitstoday.com/breathalyzer-circuit-using-8051 Home Forums Datasheets Lab Manual Testing Components Buy Project Kits Custom Search admin June - 5 - 2013 0 Comments Alcohol Breathalyzer circuit using 8051 microcontroller (AT89S51). 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
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8051 Project: Automatic Lighting and Visitor Counter Andrew Herzog Richard Baker December 13‚ 2007 CMPET 211 Executive Summary The objective of the project was to create a circuit with an 8051 microcontroller that sensed when an object passed through an infrared receiver’s receive path to automatically turn on lights and count how many times the receive path was blocked. Discussion To complete the project several smaller circuits were needed to be designed and constructed. The project
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Chapter 1 INTRODUCTION 1.1 Background of the Study Mankind has always tried to use technologies in order to improve his life. The wheel‚ for instance‚ was invented in order to transport goods saving forces and to move more quickly. The discovery of fire helped to heat him and to defend himself from wild animals. From the very beginning man has always looked for a better way of life. Time after time‚ he has continued to improve his environment‚ both at work and at home. The first automations
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References: * http://www.aaroncake.net/circuits/Electronic_Dice_Circuit.asp * http://www.kpsec.freeuk.com/projects/dice.htm * http://clarkson-uk.com/555-timer/projects/dice.html
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the meter and activates the beeper when the fuel tank is almost empty. Its point A is connected to the input terminal of the fuel meter and point B is connected to the body of the vehicle. The circuit consists of an op-amp IC CA3140 (IC1)‚ two 555 timer ICs (IC2 and IC3) and decade counter CD4017 (IC4). Op-amp IC CA3140 is wired as a voltage comparator. Its inverting input (pin 2) receives a reference voltage controlled through VR1. The noninverting input (pin 3) receives a variable voltage tapped
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Rider Lights Circuit Using NE555 timer IC Faryal shoaib (11TC-65)‚ Hafiz M.Haseeb Anwar (11TC-50)‚ M.Haseeb (11TC-32)‚ Ali Husnain (11TC-61)‚ Salman waris (11TC-59)‚ Asfand yar khan (11TC-25). Department of Telecommunication Engineering‚ University College of Engineering & Technology‚ The Islamia University of Bahawalpur‚ Pakistan. Email:engr.haseeb@live.com Abstract— There are many projects of NE555 timer IC available on internet. In which‚ I choose the project
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4017B pin connections The 4017 available from Rapid Online decade counter has ten outputs which go HIGH in sequence when a source of pulses is connected to the CLOCK input and when suitable logic levels are applied to the RESET and ENABLE inputs. 2. What is a decade counter? The counting action of the 4017 can be understood from the graph below: Just one of the individual outputs is HIGH at a time. This is quite different from the behaviour of a BCD counter like the 4510 in which it is the combination
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