project water level alarm using p89v51 microcontroller

7/28/2019 Project Water Level Alarm Using P89V51 Microcontroller

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Water Level Alarm Using

P89V51 Microcontroller


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Contents Introduction

Circuit Diagram

Working

P89V51 pin diagram

Components

Preset

Transistor BC547

Piezo Buzzer

P89V51 Microcontroller

LCD

Applications

Conclusions


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Introduction In current scenario mostly High rise buildings Housing

complexes and societies suffer from over flooding of tanks.

By this circuit we can monitor the various levels of the tank

and can avoid spillage of water .

This module or circuit can be installed in big buildings wheremanual monitor of tanks is difficult and its indicator can be

placed at some centralized place.


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Circuit Diagram


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Working Principle: This circuit works on the principle that water

conducts electricity.

A wire connected to VCC and four other wires are dipped in

tank at different levels namely quarter, half, three-fourth, full

Their output are taken on pins P3.0, P3.1, P3.2, P3.3 via a

transistor BC547.

Port P2 is connected to data pins of LCD and P1.0, P1.1, P1.2

are respectively connected to RS, RW, and EN pins of LCD


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Working(contd) Initially when the tank is empty LCD will show the message

VACANT.

As the tank starts filling up wire at different levels get some

positive voltage, due to conducting nature of water. This

voltage is then fed to their corresponding pins on controller.

When level reaches to quarter level, LCD displays the message

QUARTER.On further rise of level, HALF and 3/4 QUARTER

are displayed on LCD.

When tank gets full LCD shows the message FULL CLOSE

TAP. A buzzer is also provided to produce a alert the user when

the tank gets filled.


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Components The components present in this circuit are:

1. Preset

2. Transistor BC547

3.Piezo Buzzer

4. P89V51 Microcontroller

5.LCD


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Preset A preset is a three legged electronic component which can be

made to offer varying resistance in a circuit.

The resistance is varied by adjusting the rotary control over it.

The variable resistance is obtained across the single terminal at

front and one of the two terminals.


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The two legs at back offer fixed resistance which is divided by

the front leg.


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Transistor BC547 BC547 is an NPN bi-polar junction transistor.

A small current at its base controls a larger current at collector

and emitter terminals.

BC547 is mainly used for amplification and switching

purposes.

For amplification applications, the transistor is biased such that

it is partly on for all input conditions.


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For amplification applications, the transistor is biased such that

it is partly on for all input conditions.


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Piezo Buzzer The piezo buzzer produces sound based on reverse of the

piezoelectric effect.

These buzzers can be used to alert a user of an event

corresponding to a switching action.

It consists of piezo crystals between two conductors. When a

potential is applied across these crystals, they push on one

conductor and pull the other. This, push and pull action, results

in a sound wave.


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The buzzer produces a same noisy sound irrespective of the

voltage variation applied to it.

Most buzzers produce sound in the range of 2 to 4 kHz.


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P89V51 Microcontroller P89V51 is an 8-bit and belongs to 8051 family. It has 64 kB

flash and 1024 bytes of data RAM.

5V operating voltage and operating frequency is upto 40 MHz.

In 40 pin P89V51, there are four ports designated as P1,P2,P3

and P0. All these ports are bi-directional ports.

These ports are bit addressable.


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Pin diagram


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Liquid Crystal Display(LCD) LCD screen is an electronic display module. A 16x2 LCD

display is very basic module.

These modules are preferred over seven segments and other

multi segment LEDs.

A 16x2 LCD means it can display 16 characters per line and

there are 2 such lines.

The LCD has two registers namely command and data.


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The command register stores the command instructions given

to LCD while the data register stores the data to be displayed

on the LCD.


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Applications This circuit can be used for indoor or outdoor use, this alarm

system monitors liquid levels in holding tanks, sewage and

other non-potable water applications.


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Conclusions Liquid level alarm can monitor various levels of tank and can

avoid the spillage of water.


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References www.engineersgarage.com/microcontroller/8051projects/liquid

-level-alarm-circuit

en.wikipedia.org/wiki/Liquid_crystal_display

http://en.wikipedia.org/wiki/Preset
http://www.engineersgarage.com/microcontroller/8051projects/liquid-level-alarm-circuithttp://www.engineersgarage.com/microcontroller/8051projects/liquid-level-alarm-circuithttp://en.wikipedia.org/wiki/Liquid_crystal_displayhttp://en.wikipedia.org/wiki/Presethttp://en.wikipedia.org/wiki/Presethttp://en.wikipedia.org/wiki/Liquid_crystal_displayhttp://www.engineersgarage.com/microcontroller/8051projects/liquid-level-alarm-circuithttp://www.engineersgarage.com/microcontroller/8051projects/liquid-level-alarm-circuithttp://www.engineersgarage.com/microcontroller/8051projects/liquid-level-alarm-circuithttp://www.engineersgarage.com/microcontroller/8051projects/liquid-level-alarm-circuithttp://www.engineersgarage.com/microcontroller/8051projects/liquid-level-alarm-circuithttp://www.engineersgarage.com/microcontroller/8051projects/liquid-level-alarm-circuithttp://www.engineersgarage.com/microcontroller/8051projects/liquid-level-alarm-circuit


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Thank you

project water level alarm using p89v51 microcontroller

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