WIRELESS FUEL LEVEL

SENSOR USING RF

FREQUENCY

R.Sri Teja(10K91A0490)

R.Sharath Kumar(10K91A0487)

V.Murali Krishna(10K91A04B0)

Internal guide: Mr.G.V.Subba Rao

Introduction

What did we do

Hardware and software

Transmission section

Receiver section

AT89S52

Regulated Power Supply

RF module

LCD

Advantages & Disadvantages

Fuel or liquid level needs to be maintained in various

situations and places, as in domestic purposes i.e., in water

storage tanks, Industrial maintenance like cooling mechanism

etc.

The liquid level needs to be maintained to a particular constant

level to avoid complications.

The fuel level indication system in the Previous generations

would be like as shown in the

figure.

These type of systems are very

bulky and tough to make.

These are valid only up to few

meters.

So the technology has been

increasing rapidly, everything

has made wireless.

The Fuel level indicator is said to be one of the important part

In the fuel systems. As per the previous technology, the petrol

level indication used in fuel systems are wired and are very

bulky.

So, as per the development of technology, The Fuel level

sensing techniques used in petrol tanks are wireless.

The petrol level sensor mainly consists of two blocks i.e.,

transmission and receiver sections which uses Radio frequency.

This reduces the complexity of the level indication.

Hardware and Software

Hardware we used ? ?

• AT89S52 Microcontroller

• Power supply

• RF Transmitter and Receiver

• Encoder and Decoder

• Liquid Crystal Display (LCD)

Software we used ??

• Embedded ‘C’

• ISP to burn Chip

• RIDE to write code

Transmitter Section

What's happening??

The Probes of Sensors are placed in the tank and are

connected to ports (P3.0- P3.7) of micro controller.

The sensor ports will be enabled when the fuel level touches

the probes .

According to the code given to micro controller and signal of

the sensors, the microcontroller sends the data to the encoder

connected to the ports( P1.0 – P1.3) of micro controller.

The encoder encrypts the data and sends it to RF transmitter,

the RF transmitter sends the given data to RF receiver.

Receiver section

What's happening ??

The data that is sent by RF transmitter is received by RF

receiver.

The RF receiver is connected to decoder which decrypts the

received data. The decoder is connected to Pins(P 1.0- P1.3)

of micro controller.

The micro controller receives the data and processes

according to the code and it sends the respective result to the

LCD which is connected to pins(P 2.0- P2.7) of micro

controller.

The LCD receives the data sent by the micro controller and

displays the respective result .

WHY MICROCONTROLLER? ?• A microcontroller is a single-chip microcomputer which

contains RAM , ROM , CPU , I/O ports , ADC and otherperipherals.

• It has fixed amount of RAM , ROM , I/O ports.

• It is also called embedded microcontroller because it isdesigned for embedded systems performing specific tasksonly.

• Microprocessor only has CPU , ALU, stack pointer,program counter and other registers ,clock timing circuit.

• Microprocessor does not have RAM, ROM and I/O ports

• It requires large space and it’s cost is higher as comparedto microcontroller.

AT89S52

The AT89S52 is a low power high performance 8-bit micro computer, and it

is designed using Atmel’s high-density nonvolatile memory technology.

The main advantages of 89S52 over 8051 are

1.Software Compatibility

2.Program Compatibility

3.Rewritability

The 89S52 micro controller has an excellent software compatibility,

i.e. the software used can be applicable to any other micro controller.

The program written on this micro controller can be carried to any base.

Program compatibility is the major advantage in 89S52. The program can

be used in any other advanced micro controller. The program can be

reloaded and changed for nearly 1000 times.

Regulated Power Supply A regulated power supply is an embedded circuit that converts

unregulated AC into a constant DC.

With the help of a rectifier it converts

AC supply into DC. Its function is to

supply a stable voltage to a circuit or

device that must be operated within

certain power supply limits.

The output from the regulated power supply may be alternating or

unidirectional, but is nearly always DC

Some features of 89S52 are:

8-bit data bus.

16-bit address bus.

32 general purpose register each of 8-bits.

16 bit timers.

3 internal & 2 external interrupts.

16 bit program counter & data pointer.

Bit as well as byte addressable RAM area of 16 bytes

PIN DIAGRAM

RF Module An RF module is a small electronic circuit used to transmit and receive

radio signals.

RF modules are most often used in medium and low volume products

for consumer applications such as garage door openers, wireless alarm

systems, smart sensor applications, and wireless home automation

systems.

They are sometimes used to replace older infra-red communication

designs as they have the advantage of not requiring line-of-sight

operation.

Several carrier frequencies are commonly used in commercially-

available RF modules, including 433.92 MHz, 315 MHz, 868 MHz and

915 MHz .

RF module has Transmitter and Receiver modules.

RF Transmitter and Receiver

RF Transmitter and Receiver with their block diagrams

Liquid Crystal Display

An LCD is a device that is used to display arbitrary images.

It consists of liquid crystals between electrodes.

LCD is connected to Port(0.0 to 0.7 ) of Micro controller.

Transmission section

Receiver section

Advantages and Disadvantages

Advantages:

Automated operation

Low power consumption

Less complexity

Disadvantages:

Transmission is possible

only for short distances.

Complexity is more for

better sensing.

Applications

For level sensing in

Fuel storage centers

Automobiles

Industrial purpose.