74*245 Motor Driver

H-Bridge Driver

Simple PWM Gen.

Handy Method Measuring RPM

Measuring RPM via Photo reflector

Introduction to Robotic

DC, Stepper,and Servo Motor

Microcontroller Tutorial

Computer Interface
Tutorial
.............more links

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Source Code

// Özkal Özsoy Aug 2005
// PWMbug Robot Bug with PWM
// (Pulse Width Modulation)
// DC motor Speed control

#include <16F627.h>
#use delay(clock=4000000,RESTART_WDT)
#fuses INTRC_IO,NOPROTECT,NOBROWNOUT,NOLVP,NOCPD,NOWDT

#define TONE_PIN PIN_B0
#define bekl 500

int pwm ;
int pwmval ;

void beep(period){
while((period--) != 0)
{
output_high(TONE_PIN);
delay_ms(1);
output_low(TONE_PIN);
delay_ms(1);
}
}

void bekle(period){
while(period > 0)
{
period--;
delay_ms(1);
}
}

void dur(period){
output_low(PIN_A3);
output_low(PIN_A2);
output_low(PIN_A1);
output_low(PIN_A0);
delay_ms(period);
}

#int_rtcc // This function is called every time
clock_isr() { // the RTCC (timer0) overflows (255->0).
//if(pwmval<100) pwmval++;
//else pwmval=1;
pwmval++;
}

void sola(period){
output_high(PIN_A3);
output_low (PIN_A2);
output_low (PIN_A1);
output_high(PIN_A0);
delay_ms(period);
dur(1);
}

void saga(period){
output_low (PIN_A3);
output_high(PIN_A2);
output_high(PIN_A1);
output_low (PIN_A0);
delay_ms(period);
dur(1);
}

void ileri(period){
output_low (PIN_A3);
output_high(PIN_A2);
output_low (PIN_A1);
output_high(PIN_A0);
delay_ms(period);
}

void geri(period){
output_high(PIN_A3);
output_low (PIN_A2);
output_high(PIN_A1);
output_low (PIN_A0);
delay_ms(period);
dur(1);
}

main() {

byte start;

set_rtcc(0);
setup_counters( RTCC_INTERNAL, RTCC_DIV_1);
enable_interrupts(INT_RTCC);
enable_interrupts(GLOBAL);

dur(0);
beep(100);

pwm=0;

while(1){

if(pwmval>=pwm) dur(0);
else ileri(1);

if(!input(PIN_B2)) {
dur(500);
beep(10);
geri(bekl);
saga(bekl);
}

if(!input(PIN_B1)) {
dur(500);
beep(10);
geri(bekl);
sola(bekl);
}

if((!input(PIN_B4)) && (pwm>0)) { // geri Tuþu = Hýz azaltma
beep(5);
pwm--;
}

if((!input(PIN_B3)) && (pwm<255)) { // Ýleri Tuþu = Hýz arttýrma
beep(5);
pwm++;
}

}

}

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