Friday, July 10, 2015

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
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
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 . 

Microcontroller Project : Water Tank Controller using pic18f2550 Microcontroller
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 :


Microcontroller Project : Water Tank Controller using pic18f2550 Microcontroller
Water Tank Controller Project using Microcontroller
Microcontroller Project : Water Tank Controller using pic18f2550 Microcontroller
Water Tank Controller Project using Microcontroller

Thank You!


Battery Charge Level Indicator (5volt) using Microcontroller



Battery Charge Level Viewer is a microcontroller based small project which shows charge level of battery using 5 LEDs . Generally battery becomes full at 5volts . Remember that an ADC channel of pic18f2550 can count from 0 to 1023 . Because it's ADC channel register is 10bits. As we like to  measure 5volt  . We will read the value of adc channel and will convert it to voltage . After converting into voltage we get a understandable value and we shows it through 5 green LEDs. It's the basic concept .

ADC(Analog to Digital Converter ) :

We need a basic knowledge about ADC . Let's  take a look at here :
Thief Detector using PIC Microcontroller & PIR Motion SensorThief Detector using PIC Microcontroller & PIR Motion Sensor
Thief Detector using PIC Microcontroller & PIR Motion Sensor
ADCON1 Register


Basically ADC is like as voltage divider . According to voltage It produce output .

bit 5 : VCFG0: Voltage Reference Configuration bit (VREF- source)
1 = VREF- (AN2)
0 = VSS or 0 volt


bit 4 :VCFG0: Voltage Reference Configuration bit (VREF+ source)
1 = VREF+ (AN3)
0 = VDD or 5volt


We will set  VCFG0[bit 5]=0and VCFG0[bit4]=0 . So we will get highest value 5volt[1023] and lowest value 0volt[0].The ADCON1 is a 10 bit register that means  2 to the power 10  is it's highest counting capacity and result is 1024 . So this register can count from 0 to 1023 . When 0 volt , we get reading at RA0 pin  0 .When 5 volt , we get reading at RA0 pin 1023. It means 5volt equivalent to 1023 .

 If  1023 reading value    equal   to 5 volt.
So 1      reading value    equal   to  5/1023 volt
So 'read_val'  reading  value   equal  to (5/1023)*read_val volt

 Source Code :







void main() {
 int source=0;
 int read_val=0;
 int read=0;
   ADCON1=0x0E;                 // Configuring RA0 pin as input
   CMCON=7;
   TRISB=0x00;
  ADC_Init();                        // Initialize ADC
  PORTB.F0=0;
  PORTB.F1=0;
  PORTB.F2=0;
  PORTB.F3=0;
  PORTB.F4=0;

 while(1){
  source=ADC_Read(0);

  read_val=(source*5.50)/1023;
  read=read_val;
   if(read==1){
  PORTB.F0=0;
  PORTB.F1=0;
  PORTB.F2=0;
  PORTB.F3=0;
  PORTB.F4=1;
   }
    if(read==2){
  PORTB.F0=0;
  PORTB.F1=0;
  PORTB.F2=0;
  PORTB.F3=1;
  PORTB.F4=1;
   }
    if(read==3){
  PORTB.F0=0;
  PORTB.F1=0;
  PORTB.F2=1;
  PORTB.F3=1;
  PORTB.F4=1;
   }
    if(read==4){
  PORTB.F0=0;
  PORTB.F1=1;
  PORTB.F2=1;
  PORTB.F3=1;
  PORTB.F4=1;
   }
    if(read==5){
  PORTB.F0=1;
  PORTB.F1=1;
  PORTB.F2=1;
  PORTB.F3=1;
  PORTB.F4=1;
   }
 }
}

Circuit :

Microcontroller Project :Battery Charge Level Viewer using PIC18F2550 Microcontroller
circuit

Microcontroller Project :Battery Charge Level Viewer using PIC18F2550 Microcontroller
Microcontroller Project :Battery Charge Level Viewer using PIC18F2550 Microcontroller
Microcontroller Project :Battery Charge Level Viewer using PIC18F2550 Microcontroller


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Digital Voltmeter project Using Microcontroller


Digital Voltmeter measure voltage between two point in circuit . Now we are going to make a digital voltmeter which can measure 50 volt maximum . We will use pic18f2550 microcontroller and it's ADC pin . Remember that an ADC channel of pic18f2550 can count from 0 to 1023 . Because it's ADC channel register is 10bits. As we like to  measure 50 volt , we need to apply a simple technique . So we have to convert 50 volt to 5 volt  and we get reading 1023 at adc channel  for 50 volt .
For converting we will connect 68k ohm, 22k ohm and 10k ohm resistors in serial so that during applying 50 volt it makes 5 volt drop at 10k ohm resistor . It's the main theme .

ADC(Analog to Digital Converter ) :

We need a basic knowledge about ADC . Let's  take a look at here :
Thief Detector using PIC Microcontroller & PIR Motion SensorThief Detector using PIC Microcontroller & PIR Motion Sensor
Thief Detector using PIC Microcontroller & PIR Motion Sensor
ADCON1 Register


Basically ADC is like as voltage divider . According to voltage It produce output .

bit 5 : VCFG0: Voltage Reference Configuration bit (VREF- source)
1 = VREF- (AN2)
0 = VSS or 0 volt


bit 4 :VCFG0: Voltage Reference Configuration bit (VREF+ source)
1 = VREF+ (AN3)
0 = VDD or 5volt


We will set  VCFG0[bit 5]=0and VCFG0[bit4]=0 . So we will get highest value 5volt[1023] and lowest value 0volt[0].The ADCON1 is a 10 bit register that means  2 to the power 10  is it's highest counting capacity and result is 1024 . So this register can count from 0 to 1023 . When 0 volt , we get reading at RA0 pin  0 .When 5 volt , we get reading at RA0 pin 1023. It means 5volt equivalent to 1023 .

 If  1023 reading value    equal   to 50 volt.
So 1      reading value    equal   to  50/1023 volt
So 'read_val'  reading  value   equal  to (50/1023)*read_val .

 Source Code :






sbit LCD_RS at LATB7_bit;
sbit LCD_EN at LATB6_bit;
sbit LCD_D4 at LATB5_bit;
sbit LCD_D5 at LATB4_bit;
sbit LCD_D6 at LATB3_bit;
sbit LCD_D7 at LATB2_bit;

sbit LCD_RS_Direction at TRISB7_bit;
sbit LCD_EN_Direction at TRISB6_bit;
sbit LCD_D4_Direction at TRISB5_bit;
sbit LCD_D5_Direction at TRISB4_bit;
sbit LCD_D6_Direction at TRISB3_bit;
sbit LCD_D7_Direction at TRISB2_bit;
      char volt[]="        ";
        char mv[]="v";
void main() {
 double source=0;
 float calv=0;
 float sum=0;
 float mult=0;
  ADCON1=0x0E;                 // Configure RA) pin as input
  CMCON=7;
  ADC_Init();                        // Initialize ADC
  Lcd_Init();                        // Initialize LCD
  Lcd_Cmd(_LCD_CLEAR);               // Clear display
  Lcd_Cmd(_LCD_CURSOR_OFF);
  Lcd_Out(2,15,mv);
 while(1){
  source=ADC_Read(0);
  calv=(source*50.50)/1023;
  floattostr(calv,volt);
  Lcd_Out(1,1,"Volt Meter");
   Lcd_Out(2,1,"V=");
   Lcd_Out(2,4,volt);
 }
} 

Circuit :


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