LEVEL CONTROL SYSTEM USING MICROCONTROLLER (8051)

OBJECTIVE OF THE PROJECT In order for the project to success and to be implemented The following objectives have to be achieved are as follows : To build automatic level control which can be Use for learning tools in control To maintain the water in the certain level To design the programming using microcontroller(8051) The systems have variable settings in input and display the level in seven segment display.

SIGNAL CONDITIONING UNIT BLOCK DIAGRAM OF THE SYSTEM PROCESS VARIABLE CONTROLLING DEVICE SYSTEM SENSOR SIGNAL CONDITIONING UNIT MICROCONTROLLER ADC DAC

SYSTEM LAYOUT ADC FLOAT DAC PUMP MICROCONTROLLER RESERVOIR TANK DISPLAY MICROCONTROLLER

Components Required Tank ADC ( 0808 chip ) Level Sensor (Float) DAC Pump 89C51 microcontroller 40 pin zip socket 11.0592 MHz oscillating crystal 9V battery 2 pin pulse switch LEDs Vero Board Soldering Iron Control Valve 7 Segment Display

FLOW CHART THE WATER LEVEL FROM THE TANK IS SENSED BY THE LEVEL SENSOR POTENTIOMETER CONVERTS THE LEVEL SENSOR OUTPUT INTO VOLTAGE FORM AND FED TO ADC DIGITAL OUTPUT FROM ADC IS SENT TO THE MICROCONTROLLER PUMP ON ? YES NO THE WATER LEVEL FROM THE TANK IS SENSED BY THE LEVEL SENSOR POTENTIOMETER CONVERTS THE LEVEL SENSOR OUTPUT INTO VOLTAGE FORM AND FED TO ADC DIGITAL OUTPUT FROM ADC IS SENT TO THE MICROCONTROLLER PUMP ON ? YES NO

DIGITAL OUTPUT FROM ADC IS SENT TO THE MICROCONTROLLER POTENTIOMETER CONVERTS THE LEVEL SENSOR OUTPUT INTO VOLTAGE FORM AND FED TO ADC DIGITAL OUTPUT FROM ADC IS SENT TO THE MICROCONTROLLER PUMP ON ? YES NO ADC O/P > MAX VALUE ? ADC O/P < MIN VALUE ? POTENTIOMETER CONVERTS THE LEVEL SENSOR OUTPUT INTO VOLTAGE FORM AND FED TO ADC DIGITAL OUTPUT FROM ADC IS SENT TO THE MICROCONTROLLER YES NO PUMP ON ? ADC O/P > MAX VALUE ? ADC O/P < MIN VALUE ?

DIGITAL OUTPUT FROM ADC IS SENT TO THE MICROCONTROLLER PUMP ON ? YES NO ADC O/P > MAX VALUE ? ADC O/P < MIN VALUE ? PUMP OFF PUMP ON NO ACTION DIGITAL OUTPUT FROM ADC IS SENT TO THE MICROCONTROLLER PUMP ON ? YES NO ADC O/P > MAX VALUE ? ADC O/P < MIN VALUE ? PUMP OFF PUMP ON NO ACTION

Circuit diagram of interfacing between the microcontroller and the ADC

WORK SO FAR

DISCUSSION In our project, we tried our best to perform some practical work. When doing this we faced some problems and we have overcome all problems after calculating a repeated number of times. First problem we have faced is soldering the circuit. Secondly ,we face another problem when we are going to solder the microcontroller chip. This problem is solved by installing the zip sockets. Thirdly, we faced problem while trying to install 8-pin elements and 2-pin elements.We damaged some of LED while testing and we forced to buy other good LED replacing those damaged ones. Fourthly ,we faced problem while soldering the elements in the Vero board.

Scope of the project The scope of the project is very large and market demand is quite high. It is very useful for every process in industry as well as in research center and industrial laboratories . It is also useful for Chemical industries and factories which pack drinks and medicines.

Environmental Impact The components used are very less harmful to the environment . The gas formed due to unknowingly burning of wire is very less. Only the burning gas from battery and the motor coil cause a little harm but it is also negligible. Thus designed control system has almost no bad effect on the environment, except if the subjects remaining of building the prototype are to be thrown in the environment

Future Aspect The unused port of the µC can be implemented for future use. The whole schematic , that is the level control loop can be designed in a computer so that the total system can be viewed & operated manually when required from a distant location.

Conclusion Software experience is to be gained throughout working on this project on different scale. By doing the project we have got a chance to implement our knowledge we have gained so far in our engineering carrier. Different skills like Team working capabilities, time managing and work managing skill are to be cultured during the project sessions. Learned ethics and lessons .