Water Level Indicator Project using Microcontroller

Water tank controller  is an embedded project where motor switch automatically controlled by a microcontroller .When tank's water level is very low , the microcontroller system turns on the motor switch , Until the water level is full or 100% and the motor switch remains on . When microcontroller get notification tank is full , it turns off the switch of motor . Until the tank is empty this stage remains on . 

Now the question is , how can we get notification about water level ? We will apply a technique . Look at the picture given below .

Microcontroller Project : Water Tank Controller using pic18f2550 Microcontroller

Here microcontroller pins (RA0-RA4)  are connected to VDD through five 10k Ohm resistors . Five cables are connected to the points between resistors first end points and mcu (RA0-RA4)pin points . Those five (A,B,C,D,E) cables are hanged  into the tank at different five levels(A,B,C,D,E) so that each cable represents each of five levels individually .

Microcontroller Project : Water Tank Controller using pic18f2550 Microcontroller

Once water level goes to E level , it makes enable the connection between GND and 'E' level cable . So , it makes the RA4 pin GND(logical 0) and we get notification the tank is empty . Consequently the system turns on the motor of switch . 

Water Tank Controller Project using Microcontroller

When it's full, all the mcu pins(RA0-RA4) goes to low or 0 . We get the notification tank is full the motor needs to be turned off . That's the working process of this system.

Souece Code :

void main() {
   ADCON1=0x0F;                 // Configure RA) pin as input
   CMCON=7;
   TRISC.F0=0;
   TRISA.F0=1;
   TRISA.F1=1;
   TRISA.F2=1;
   TRISA.F3=1;
   TRISA.F4=1;
   TRISB=0x00;
 while(1){
  if(PORTA.F4==0 && PORTA.F3==0 && PORTA.F2==0 &&  PORTA.F1==0 && PORTA.F0==0){
      PORTB.F0=1;
      PORTB.F1=1;                                         // 100% full
      PORTB.F2=1;
      PORTB.F3=1;
      PORTB.F4=1;
      PORTC.F0=0;   //motor turned off
       }
   if(PORTA.F4==0 && PORTA.F3==0 && PORTA.F2==0 &&  PORTA.F1==0 && PORTA.F0==1){
      PORTB.F0=0;
      PORTB.F1=1;                                        // 80% full
      PORTB.F2=1;
      PORTB.F3=1;
      PORTB.F4=1;}
   if(PORTA.F4==0 && PORTA.F3==0 && PORTA.F2==0 &&  PORTA.F1==1 && PORTA.F0==1){
      PORTB.F0=0;
      PORTB.F1=0;
      PORTB.F2=1;                                            // 60% full
      PORTB.F3=1;
      PORTB.F4=1;

       }
   if(PORTA.F4==0 && PORTA.F3==0 && PORTA.F2==1 &&  PORTA.F1==1 && PORTA.F0==1){
      PORTB.F0=0;
      PORTB.F1=0;                                            // 40% full
      PORTB.F2=0;
      PORTB.F3=1;
      PORTB.F4=1;
 }
  if(PORTA.F4==0 && PORTA.F3==1 && PORTA.F2==1 &&  PORTA.F1==1 && PORTA.F0==1){
      PORTB.F0=0;
      PORTB.F1=0;
      PORTB.F2=0;
      PORTB.F3=0;                                              // 20% full
      PORTB.F4=1;
      PORTC.F0=1;   //motor turned on
       }
 }
}

Circuit :

Water Tank Controller Project using Microcontroller

Water Tank Controller Project using Microcontroller

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Thank You!