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This article describes a microcontroller Based automatic bottle filling system which senses the presence of bottle and level of liquid in it and than fills it accordingly up to a fixed level. In this project, the infrared proximity sensors are used for detecting the presence of the bottle and LDR and voltage comparators are used for sensing the level of liquid in the bottle. Fuzzy logic is used for controlling the filling of the liquid in the bottle. sample input to the computer is provided by the microcontroller . The control signal for solenoid tap is generated by the matlab program taking the sample input from the microcontroller as the input.
The block diagram of the system consists of the PC, MAX232, microcontroller 89c51, level sensor, proximity sensor, solenoid valve, bottle filling machine.

Description of Microcontroller
The microcontroller used for the project is AT89C52 which is a low-power, high performance 8 bit microcontroller. Atmel’s high-density nonvolatile memory technology goes into the manufacture of this device.It is compatible with the industry-standard 80C51 instruction set and pinout.

Get the details of the project here:
http://www.scribddoc/23273863/Bottle-Filling-System

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INTRODUCTION:
The aim of this project is to design an microcontroller Based automatic bottle filling system that sense the presence of bottle and level of liquid in it and than fills it accordingly up to a fixed level. In this project we developed proximity sensor using infrared sensor that detects the presence of bottle and for detecting level of liquid we used Light dependent resistors and voltage comparator to sense the level of liquid in bottle.
Here we used Fuzzy logic to control the filling of liquid in bottle. Microcontroller provides the sample input to the computer and with these input Matlab program generates control signal for solenoid tap and that can be accessed by it through microcontroller.
Description of Microcontroller:
89s52: The AT89S52 is a low-power, high-performance CMOS 8-bit microcontroller with 8K bytes of in-system programmable Flash memory. The device is manufactured using Atmel’s high-density nonvolatile memory technology and is compatible with the industry-standard 80C51 instruction set and pinout. The on-chip Flash allows the program memory to be reprogrammed in-system or by a conventional nonvolatile memory programmer. By combining a versatile 8-bit CPU with in-system programmable Flash on a monolithic chip, the Atmel's AT89S52 is a powerful microcontroller which provides a highly-flexible and cost-effective solution to many embedded control applications. The AT89S52 provides the following standard features: 8K bytes of Flash, 256 bytes of RAM, 32 I/O lines, Watchdog timer, two data pointers, three 16-bit timer/counters, a six-vector two-level interrupt architecture, a full duplex serial port, on-chip oscillator, and clock circuitry. In addition, the AT89S52 is designed with static logic for operation down to zero frequency and supports two software selectable power saving modes. The Idle Mode stops the CPU while allowing the RAM, timer/counters, serial port, and interrupt system to continue functioning. The Power-down mode saves the RAM con-tents but freezes the oscillator, disabling all other chip functions until the next interrupt
The hardware is driven by a set of program instructions, or software. Once familiar with hardware and software, the user can then apply the microcontroller to the problems easily.
The pin diagram of the 8051 shows all of the input/output pins unique to microcontrollers:
The following are some of the capabilities of 8051 microcontroller.
 Internal ROM and RAM
 I/O ports with programmable pins
 Timers and counters
 Serial data communication
The 8051 architecture consists of these specific features:
 16 bit PC &data pointer (DPTR)
 8 bit program status word (PSW)
 8 bit stack pointer (SP)
 Internal ROM 4k
 Internal RAM of 128 bytes.
 4 register banks, each containing 8 registers
 80 bits of general purpose data memory
 32 input/output pins arranged as four 8 bit ports0-P3
 Two 16 bit timer/counters: T0-T1
 Two external and three internal interrupt sources
 Oscillator and clock circuits