PROJECT TITLE9 LEVEL OVERHEAD WATER TANK NDICATOR

Submitted byGuriya RaniRoll No. :ECE Department

ABSTRACT

This is the circuit designed for overhead tank digital water level indicator.

It is built around priority encoder, BCD-to-7-segment decoder, 7-segment display and a few discrete components.

Due to high input impedance, priority encoder senses water in the container from its nine input terminals.

The inputs are connected to +5V. The ground terminal of the sensor must be kept

at the bottom of the container (tank).

PROJECT BLOCK DIAGRAM

HARDWARE REQUIREMENTS

POWER SUPPLY BLOCK

74HC147

CD4511

TRANSISTOR

7-SEGMENT DISPLAY

LED

1N4007

RESISTOR

CAPACITOR

POWER SUPPLY

230 V AC 50 Hz

5V DC

12V step down transformer

Filter(470µf)

5v RegulatorBridge rectifier

10-TO-3 LINE PRIORITY ENCODER (74HC147)

The 74HC/HCT147 are high-speed Si-gate CMOS devices

and are pin compatible with low power Schottky TTL

(LSTTL).

The devices provide the 10-line to 3-line priority encoding

function by use of the implied decimal “zero”. The “zero”

is encoded when all nine data inputs are HIGH, forcing all

four outputs HIGH.

The 74HC/HCT147 9-input priority encoders accept data

from nine active LOW inputs (A0 to A8) and provide a

binary representation on the four active LOW outputs

(Y0

to Y3).

Functional Diagram

FEATURES

• Encodes 10-line decimal to 3-line BCD

• Useful for 10-position switch encoding

• Used in code converters and generators

• Output capability: standard

ICC category: MSI

BCD-TO-7 SEGMENT DECODER/DRIVER (CD4511)

The CD4511BC BCD-to-seven segment

latch/decoder/ driver is constructed with

complementary MOS (CMOS) enhancement

mode devices and NPN bipolar output drivers in

a single monolithic structure.

The circuit provides the functions of a 3-bit

storage latch, an 8321 BCD-to-seven segment

decoder, and an output drive capability.

It can be used with seven-segment light

emitting diodes (LED), incandescent, fluorescent,

gas discharge, or liquid crystal readouts either

directly or indirectly.

FEATURES

Low logic circuit power dissipation

High current sourcing outputs (up to 25 mA)

Latch storage of code

Blanking input

Lamp test provision

Readout blanking on all illegal input

combinations

Lamp intensity modulation capability

Time share (multiplexing) facility

Equivalent to Motorola MC13511

BC547

The BC547 transistor is an NPN Epitaxial

Silicon Transistor.

The BC547 transistor is a general-purpose

transistor in small plastic packages.

It is used in general-purpose switching and

amplification BC847/BC547 series 45 V, 100

mA NPN general-purpose transistors.

Whenever base is high, then current starts

flowing through base and emitter and after

that only current will pass from collector to

emitter 

RESISTOR

Resistor is a two terminal passive electrical component that implements electrical resistance as a circuit element.

Resistors limits or regulate the flow of electrical current in an electronic circuit.

Resistors are available in a range of different resistance values which are used as per the requirement.

CAPACITOR

Capacitor is a two terminal passive electrical component used to store the electrical energy electrostatically in an electrical field

Capacitors are two types electrolytic and ceramic.

Ceramic capacitors are unpolarized. These capacitors have negligible internal inductance or resistance.

Electrolytic capacitors are polarized and if connected backwards are likely to explode.

1N4007

Diodes are used to convert AC into DC these are used as half wave rectifier or full wave rectifier. Three points must he kept in mind while using any type of diode.

LED LEDs are semiconductor devices are made out of silicon

When current passes through the LED, it emits photons as a

byproduct. Normal light bulbs produce light by heating a

metal filament until its white hot

LEDs present many advantages over traditional light sources

including lower energy consumption, longer lifetime,

improved robustness, smaller size and faster switching

BIBILOGRAPHY

www.beyondlogic.org

www.wikipedia.org

www.howstuffworks.com

www.alldatasheets.com

QUERIES ?

THANKYOU