Download Water Level Controller Project Source Code | Embedded System
Download Water Level Controller Project Source Code and Circuit Design
This article explains you how to detect and control the water level in an overhead tank or any other container. This system monitors the water level of the tank and automatically switches ON the motor when ever tank is empty. The motor is switched OFF when the overhead tank or container is FULL. Here the water level of the tank is indicated on LCD (Liquid crystal Display). Using this system, we can avoid the overflow of the water. Here we are designing the circuit which is used to detect and control the water level automatically in overhead tank using 8051 microcontroller.
Water Level Controller using 8051 Circuit Principle:
This system mainly works on a principle that “water conducts electricity”. The four wires which are dipped into the tank will indicate the different water levels. Based on the outputs of these wires, microcontroller displays water level on LCD as well as controls the motor.
Components Required:
- 8051 Controller (AT89c51)
- Switches
- 16×2 LCD
- Motor
Water Level Controller using 8051 Circuit Diagram:
Water Level Controller using 8051 Circuit Description:
The main heart of this project is AT89C51 microcontroller. The water level probes are connected to the P3.0, P3.1, P3.2, and P3.3 through the transistors. Port P2 connected to the data pins of LCD and control pins RS, RW and EN of LCD are connected to the P1.0, P1.1, and P1.2 respectively.
Initially when tank is empty, LCD will display the message EMPTY and motor runs automatically. When water level reaches to quarter level, now LCD displays QUARTER and still motor runs. For further levels, LCD displays the messages HALF and ¾ FULL.
When tank is full, LCD displays FULL and motor automatically stops. Again motor runs when tank is empty.
Program for Water Level Controller:
#include
sbit rs=P1^0; //register select pin
sbit rw=P1^1; //read/write pin
sbit e=P1^2; //enable pin
sbit quat=P3^1; //pin connected to quater level of tank
sbit half=P3^2; //pin connected to half level of tank
sbit quat_3=P3^3; //pin connected to three -fourth level of tank
sbit full=P3^4; //pin connected to full level of tank
sbit spkr_on=P3^5;
sbit spkr_off=P3^6; // pin to off speaker
void delay(int k) //delay function
{
int i,j;
for(i=0;i<k;i++)
for(j=0;j<1275;j++);
}
void write(int j) //write function
{
rs=1; //selecting command register
rw=0; //selecting to write
P2=j; //putting value on the pins
e=1; //strobe the enable pin
delay(1);
e=0;
return;
}
void cmd(int j) //command function
{
P2=j; //put the value on pins
rs=0; //selecting command register
rw=0; //selecting to write
e=1; //strobe enable pin
delay(1);
e=0;
return;
}
void puts(char *a) //puts function to print a string
{
unsigned int p=0;
for(;a[p]!=0;p++)
write(a[p]);
}
void lcd_init(void) // function to initialise the LCD
{
cmd(0x38); //setting 8-bit interface, 2 lines, 5*7 Pixels
delay(50);
cmd(0x0e); //turning on underline visible cursor
delay(50);
cmd(0x01); //clearing screen
delay(50);
cmd(0x80); //moving cursor to the begining of line 1 of LCD
}
void main()
{
quat=half=quat_3=full=spkr_off=1; //configuring as input pins
quat=half=quat_3=full=spkr_off=0; //lowering input pins
spkr_on=1; // making speaker on pin high,as it works on negative logic
while(1)
{
while(quat==0&&half==0&&quat_3==0&&full==0&&spkr_off==0) //condition when tank is empty
{
lcd_init(); // initialising LCD
puts("VACANT"); //printing VACANT on lcd
}
while(quat==1&&half==0&&quat_3==0&&full==0&&spkr_off==0) //condition when tank is quater
{
lcd_init();
puts("QUATER"); //printing QUATER on lcd
}
while(quat==1&&half==1&&quat_3==0&&full==0&&spkr_off==0) //condition when tank is half
{
lcd_init();
puts("HALF"); //printing HALF on lcd
}
while(quat==1&&half==1&&quat_3==1&&full==0&&spkr_off==0) //condition when tank is three-fourth
{
lcd_init();
puts("3/4 FULL"); //printing 3/4 FULL on lcd
}
while(quat==1&&half==1&&quat_3==1&&full==1&&spkr_off==0) //condition when tank is full
{
lcd_init();
puts("FULL;CLOSE TAP"); //printing FULL;CLOSE TAP on lcd
spkr_on=0;// Enabling speaker
}
while(quat==1&&half==1&&quat_3==1&&full==1&&spkr_on==0&&spkr_off==1)//enabling high speaker_off pin
{
spkr_on=0;//disabling speaker
}
}
}
Water Level Controller Circuit Advantages:
- Human effort is reduced as the system controls the motor automatically based on the water level.
- This system consumes less power.
- Simple and more reliable.
Kindly include presentation...