9 LEVEL OVERHEAD WATER TANK NDICATOR Submitted by

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 Bridge rectifier 5v Regulator 230 V AC 50 Hz 5V DC Filter(470µf) 12V step down transformer

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).

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 Functional Diagram

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

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