Cspass
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This document summarizes the Card Swiping and Password Authentication Security System (CSPASS). The system uses an AT89C52 microcontroller, optocoupler, keys, relay, buzzer, and LCD display. It requires a user to swipe their card which is read by the optocoupler, then enter a password on the key matrix which is authenticated before a relay is activated, granting access. Power is supplied through a transformer, rectifier, and voltage regulator to power the various components.
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This document describes a voltage doubler circuit that uses a 555 timer integrated circuit. It consists of two capacitors, two diodes, a 555 timer IC, resistors, and a power supply source. The 555 timer generates a square wave that is input to the voltage doubler circuit. The capacitors and diodes in the doubler circuit charge and discharge to output a voltage that is approximately twice the input voltage. The document explains the components, circuit diagram, and working principle of how the 555 timer and voltage doubler combine to multiply the input voltage.
Integrated circuit
World of ICs provides an introduction to integrated circuits (ICs). It discusses the benefits of ICs such as reduced size and ease of implementation. It then covers the history and development of ICs, including Jack Kilby's invention of the first IC at Texas Instruments. The document teaches basic IC concepts like photolithography and packaging types. It also provides instructions for identifying IC specifications and experimenting with common ICs like the 555 timer and logic gates.
Digital voltmeter using 89c51 microcontroller
Voltmeter is a voltage measuring instrument.
We can measure the potential difference between any two points in an electrical network using voltmeter.
There are two types of voltmeter as analog voltmeter and digital voltmeter.
Analog voltmeter moves pointer on a scale but it has some limitations like accuracy of few percent of full scale.
Digital voltmeter can display numerical value of voltage on a display by use of analog to digital converter (ADC).
All the data processing and manipulating is in digital form, so it is very essential to use ADC.
We have used ADC0804 analog-to-digital converter IC. The range of input voltage is 0-15V. Here the input voltage should be DC voltage so as to get the steady output on the LCD display.
If you give the AC voltage as an input, it will display continuously running numbers as the nature of AC voltage.
Temperature Based Fan Controller
Temperature Based Fan Controller can be used for reducing the power consumption & also to assist people who are disabled and are unable to control the speed of fan.It may also be used for monitoring changes in environment.
digitalvoltmeterusing805112b2-170214173216 (1).pdf
This document describes the design of a digital voltmeter using an 8051 microcontroller and ADC0804 analog-to-digital converter. It includes the circuit diagram and explanations of the main components. The 8051 microcontroller reads the analog input voltage, converts it to a digital value using the successive approximation ADC0804, and displays the reading on an LCD screen. The document provides details on interfacing the ADC0804 and LCD, as well as the pin descriptions and timing diagrams for programming and operation. It aims to explain how to build a digital voltmeter circuit using low-cost microcontroller and ADC components.
DIGITAL VOLTMETER USING 8051 MICROCONTROLLER
This document describes the design of a digital voltmeter using an 8051 microcontroller. It includes the following key points:
- An analog to digital converter (ADC0804) is used to convert an analog input voltage to a digital signal that can be read by the microcontroller.
- The 8051 microcontroller then processes the digital signal from the ADC and displays the voltage reading on a liquid crystal display (LCD).
- The circuit diagram shows how the ADC, microcontroller, and LCD are interconnected. Key components include ports for input/output, a crystal oscillator, and voltage regulators.
- The document provides details on the pin configurations and functions of the 8051 microcontroller and ADC0804
Remotely Secured Device Automation using Infrared
This document describes a remote control system that uses infrared signals to automate and control electrical devices remotely up to 10 meters away. The system uses an HT12E encoder and HT12D decoder, along with a TSOP1738 IR sensor. The encoder generates encoded codes that are modulated with a 38kHz carrier signal from a 555 timer circuit and transmitted via an IR LED. The receiver uses the TSOP1738 sensor to detect the 38kHz IR signals and provides the output to the HT12D decoder. The decoder interprets the address and data signals to control 4 devices by toggling the output pins of a microcontroller. A relay circuit then uses the microcontroller outputs to supply power to the devices being automated.
Pt4115 e
The PT4115 is a step-down LED driver that operates from 6-30V and provides up to 1.2A of output current. It uses high-side current sensing and has a DIM input that allows for PWM or DC dimming from 5000:1 to 25:1. It is available in SOT89-5 and ESOP8 packages and is designed for applications such as lighting, signs, and backlighting.
Speed Control of DC motor using AT89C52 IC
This document describes a project to control the speed of a DC motor using pulse width modulation (PWM) generated by an AT89C52 microcontroller. The document outlines the purpose, components, circuit diagram, programming, and workflow. Key components include an AT89C52 microcontroller, L293D motor driver, DC motor, voltage regulator, and buttons. PWM signals of varying duty cycles control the motor's speed. Code uses timers to generate PWM and buttons to select speed. The summary provides an overview of the goal and approach.
Cockpit White Box
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A SYNOPSIS ON VARIABLE POWER SUPPLY WITH DIGITAL CONTROL
This document is a synopsis for a variable power supply with digital control submitted by four students. It describes a circuit built around regulators, counters, and a timer that provides adjustable and stable positive and negative DC voltages. The circuit steps down AC mains voltage before rectifying and regulating it. A timer and counter are used to sequentially activate presets that set the output voltage level. LEDs indicate the voltage levels, and switches allow resetting the output voltage or turning the power off.
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Cspass
- 1. Report on final year project CARD SWIPING AND PASSWORD AUTHENTICATION SECURITY SYSTEM (CSPASS)
- 2. INTRODUCTION: Card swiping and password authentication security system is a security system involving a card swiping system after which a password is asked for granting access into a particular authorized area.
- 7. PIN DIAGRAM
- 8. POWER SUPPLY