Wireless fuel level sensor usng RFID frequency.

1. 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

2.  Introduction
 What did we do
 Hardware and software
 Transmission section
 Receiver section
 AT89S52
 Regulated Power Supply
 RF module
 LCD
 Advantages & Disadvantages

3.  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.

4.  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.

5.  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.

6. 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

7. Transmitter Section

8. 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.

9. Receiver section

10. 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 .

11. WHY MICROCONTROLLER? ?
• A microcontroller is a single-chip microcomputer which
contains RAM , ROM , CPU , I/O ports , ADC and other
peripherals.
• It has fixed amount of RAM , ROM , I/O ports.
• It is also called embedded microcontroller because it is
designed for embedded systems performing specific tasks
only.
• 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 compared
to microcontroller.

12. 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.

13. 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

14.  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

15. 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.

16. RF Transmitter and Receiver
RF Transmitter and Receiver with their block diagrams

17. 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.

18. Transmission section

19. Receiver section

20. 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.

21. Applications
For level sensing in
 Fuel storage centers
 Automobiles
 Industrial purpose.