SIMPLE RPM MEASUREMENT USING TIMER 0 OF PIC MICRO-CONTROLLER
Description
PIC micro-controllers have most important future like Timers & Counter.
They can be used to perform a variety of time precision functions, such as generating events at specific times, measuring the duration of an event, keeping date and time record, counting events, etc.
The main component of a timer module is a free running binary counter that increments for each incoming pulse. Since it runs independently, it can count pulses concurrently with the main program execution.
A PIC18F4431 micro-controller has built-in hardware timer modules: Timer 0 , Timer 1 , Timer 2 And Timer 5 .
Theory
The Timer 0 module in a PIC18F4431 micro-controller is an 8-bit or 16 - bit synchronous counter that stores the value for the counter in the special function register called T0CON.
First of all Crystel of PIC microcontroller i have use external but also use internal to create accurate delay.
In RPM measurement is most important is take sample and refresh LCD in 1 Second.
So , TIMER 0 count the input signal in 1 Second and and that's time timer 0 value is loaded in Any int variable to multiplies 60 given the RPM. below is the equation Of RPM.
1 Hz = 60 RPM
Initialize Appropriate PORT of PIC18F4431 . Setting Parameter of Timer and Initialize LCD and Hardware. And Bingooooo. project Work . Line by Line Code and Circuit Diagram is Below.
Circuit Diagram
Below Is the Circuit Diagram Of RPM meter . i have designed in Proteus V. 7.0. you have simply transform for you version.
.As in my Project I have a use Opto Senser to read input via on interrupt pin Of micro-controller. below is the opto-Sensor.
Now Every Thing Is About Coding. Simple Count the sample of opto sensor in 1 second And display result on LCD.
Micro C Code
First of all Setting of Configuration Window Tab on Micro c Pro Editor.
Please Press Ctrl + Shift + E to open Below Tab and appropriate Setting.
Description
PIC micro-controllers have most important future like Timers & Counter.
They can be used to perform a variety of time precision functions, such as generating events at specific times, measuring the duration of an event, keeping date and time record, counting events, etc.
The main component of a timer module is a free running binary counter that increments for each incoming pulse. Since it runs independently, it can count pulses concurrently with the main program execution.
A PIC18F4431 micro-controller has built-in hardware timer modules: Timer 0 , Timer 1 , Timer 2 And Timer 5 .
Theory
The Timer 0 module in a PIC18F4431 micro-controller is an 8-bit or 16 - bit synchronous counter that stores the value for the counter in the special function register called T0CON.
First of all Crystel of PIC microcontroller i have use external but also use internal to create accurate delay.
In RPM measurement is most important is take sample and refresh LCD in 1 Second.
So , TIMER 0 count the input signal in 1 Second and and that's time timer 0 value is loaded in Any int variable to multiplies 60 given the RPM. below is the equation Of RPM.
1 Hz = 60 RPM
Initialize Appropriate PORT of PIC18F4431 . Setting Parameter of Timer and Initialize LCD and Hardware. And Bingooooo. project Work . Line by Line Code and Circuit Diagram is Below.
Circuit Diagram
Below Is the Circuit Diagram Of RPM meter . i have designed in Proteus V. 7.0. you have simply transform for you version.
.As in my Project I have a use Opto Senser to read input via on interrupt pin Of micro-controller. below is the opto-Sensor.
Now Every Thing Is About Coding. Simple Count the sample of opto sensor in 1 second And display result on LCD.
Micro C Code
First of all Setting of Configuration Window Tab on Micro c Pro Editor.
Please Press Ctrl + Shift + E to open Below Tab and appropriate Setting.
Now Below Is the Code.
unsigned long RPM_Value;
// Define LCD module connections.
sbit LCD_RS at RB3_bit;
sbit LCD_EN at RB2_bit;
sbit LCD_D4 at RB4_bit;
sbit LCD_D5 at RB5_bit;
sbit LCD_D6 at RB6_bit;
sbit LCD_D7 at RB7_bit;
sbit LCD_RS_Direction at TRISB3_bit;
sbit LCD_EN_Direction at TRISB2_bit;
sbit LCD_D4_Direction at TRISB4_bit;
sbit LCD_D5_Direction at TRISB5_bit;
sbit LCD_D6_Direction at TRISB6_bit;
sbit LCD_D7_Direction at TRISB7_bit;
// End LCD module connection definition
// Define Messages
char message1[] = "RPM Meter";
char *RPM = "00000 RPM";
void Display_RPM(unsigned long num)
{
RPM[0] = num/10000 + 48;
RPM[1] = (num/1000)%10 + 48;
RPM[2] = (num/100)%10 + 48;
RPM[3] = (num/10)%10 + 48;
RPM[4] = num%10 + 48;
Lcd_Out(2,4,RPM);
}
void main()
{
int i = 1;
TRISD = 0x00; // PORTD as a output.
PORTC = 0x00;
TRISC = 0b00001000; // RC3 as a input of Sensor
T0CON = 0b01101000; // TMR0 as 16-bit counter
Lcd_Init(); // Initialize LCD
Lcd_Cmd(_LCD_CLEAR); // CLEAR display
Lcd_Cmd(_LCD_CURSOR_OFF); // Cursor off
Lcd_Out(1,4,message1); // Write message1 in 1st row
while(1)
{
// Below Loop Rotate 4 time means 0.25 x 4 = 1 Second Delay loop
for(i = 0 ; i < 4 ; i++)
{
T0CON.TMR0ON = 1; // Start the timer
TMR0L = 0; // Initialize Default load timer high and low byte to 0.
TMR0H = 0;
Delay_ms(250); // Wait for 0.25 sec
T0CON.TMR0ON = 0; // Stop the timer
RPM_Value += (256*TMR0H + TMR0L);
}
RPM_Value = RPM_Value * 60; // Multiply by 60 to get RPM
Display_RPM(RPM_Value); // Display The RPM
RPM_Value = 0; // RPM_Value to 0 to clear Variable.
}; // Infinite Loop
}
You have also created 1 Sec Delay using Micro C Default library. like below code use
while(1)
{
T0CON.TMR0ON = 1; // Start the timer
TMR0L = 0; // Initialize Default load timer high and low byte to 0.
TMR0H = 0;
Delay_ms(1000); // Wait for 1 sec
T0CON.TMR0ON = 0; // Stop the timer
RPM_Value = (256*TMR0H + TMR0L);
}
Now Complete Source File and Schematic is Below Find Attachment and use your any pic and see what happened with your device.
Download File
https://sites.google.com/site/micronikunjp703/rpmmeter/pic18f4431rpmcounter.rar?attredirects=0&d=1
