Project 1 - Controlling a DC motor using PWM and monitoring its Running status
Hello,
I have attached the code for the project as shown below along with the necessary screenshots from the simulide showing the simulation is working.
I have also attached the src file "main.c" which contains the code for the project.
Thank You!
/*
* AVR_Project_01_motor_control.c
*
* Created: 9/14/2024 7:28:26 PM
* Author : Lareb Khan
*/
#include <avr/io.h>
#include "avr/interrupt.h"
#include <util/delay.h>
/*----- MACROS----- */
/* Define the crystal frequency */
#define F_CPU 16000000L
/* d1 pin is declared as push button for direction control */
#define sw_dir (PIND & (1<<1))
/* d2 pin is declared as push button for speed control */
#define sw_dspd (PIND & (1<<2))
/* c3 is declared as push button for power ON/OFF */
#define pw (PINC & (1<<3))
/* PORTB pins are for LCD data */
#define lcd_port PORTB
/* d5 pin is used for Register Select(RS) */
#define RS_high PORTD |= (1<<5)
/* d5 pin is used for RS */
#define RS_low PORTD &=~ (1<<5)
/* d6 pin is used for Enable */
#define EN_high PORTD |= (1<<6)
/* d6 pin is used for En. */
#define EN_low PORTD &=~ (1<<6)
unsigned char i;
/* command for lcd display */
void lcd_cmd(char cmd)
{
/* 4 bits for 4 bit lcd mode */
lcd_port = (cmd & 0xf0);
RS_low;
EN_low;
/* after 1ms disable lcd */
_delay_ms(1);
/* enable the lcd */
EN_high;
lcd_port = ((cmd<<4) & (0xf0));
RS_low;
EN_low;
_delay_ms(1);
/* enable the lcd */
EN_high;
}
/* send the data to lcd */
void lcd_data (char data)
{
/* 4 bits for 4 bit lcd mode */
lcd_port = (data & 0xf0);
/* access data register */
RS_high;
EN_low;
_delay_ms(1);
EN_high;
lcd_port = ((data<<4) & (0xf0));
RS_high;
EN_low;
_delay_ms(1);
EN_high;
}
void lcd_init()
{
/* used for 4 bit lcd mode */
lcd_cmd(0x28);
_delay_ms(5);
/* return home */
lcd_cmd(0x02);
_delay_ms(5);
/* clear screen */
lcd_cmd(0x01);
_delay_ms(5);
/* display on cursor off */
lcd_cmd(0x0C);
_delay_ms(5);
/* increment the display cursor */
lcd_cmd(0x06);
_delay_ms(5);
/* force cursor to begin from 1st line */
lcd_cmd(0x80);
_delay_ms(5);
}
void cursorpos(char x,char y)
{
if((x<1 || x>2) || (y>16 || y<1 )) //condition will checks the 2 rows and 16 columns
{
x=1; //x= row
y=1; //y= column
}
if(x==1)
{
lcd_cmd(0x7F + y); //{ 80-1 = 7F} for starting the 1st line hex decimal value (80) {y we r using the 7F+y means we need to dtart from that column}
}
else //(x==2)
{
lcd_cmd(0xBF + y); //{0C-1 = 0B} for starting the 2nd line, 2nd row.
}
}
void lcd_out(char x, char y, char *str)
{
cursorpos(x,y);
while(*str)
{
lcd_data(*str);
str++;
}
}
/* Reading the ADC channels values */
int adc_read(char channel)
{
unsigned int a, result;
/* here we are going to use which channel we need to select in MUX, here using 2 bit */
ADMUX = channel;
/* control & status register to enable the ADC conversion ,enable the interrupt flag, ADC interrupt. ADEN=1 */
ADCSRA = 0X80;
/* clearing the ADC registers */
ADCH = 0X00;
ADCL = 0x00;
/* Start the conversion 6 bit ADSC high */
ADCSRA |= (1<<6);
/* while loop till the conversion become zero means conversion of ADC (0x40 means interrupted pin ) */
while((ADCSRA & 0x40) != 0);
/* Dummy data type a and is stored the ADCL register (ADC0-ADC7) */
a= ADCL;
/* Store the high value (ADC8-ADC9) */
result = ADCH;
result = result<<8;
/* Adding the ADCL + ADCH to get the 16 bits */
result = result | a ;
return result;
}
int main(void)
{
/* Declaring all 8-pins of PORT B as output. */
DDRB = 0XFF;
/* Declaring A0 & A1 pins as output. */
DDRA |= ((1<<0)| (1<<1));
/* Declaring D1 pin as input. */
DDRD &=~ (1<<1);
/* Declaring D2 pin as input. */
DDRD &=~ (1<<2);
/* Declaring D5 pin as output. */
DDRD |= (1<<5);
/* Declaring D6 pin as output. */
DDRD |= (1<<6);
/* Declaring C3 pin as input. */
DDRC &=~ (1<<3);
/* Enabling internal pull up resistor for D2. */
PORTD |= (1<<2);
/* Enabling internal pull up resistor for D3. */
PORTC |= (1<<3);
/* Initializing to 64 because we are running the motor with 25% duty cycle. */
i=64;
/* Using the Non-Inverting mode, PWM phase correct mode,NO prescalar. */
TCCR0=0X61;
/* Using INT0 for interrupt */
GICR=(1<<INT0);
/* Make interrupt negative edge triggered */
MCUCR=0X02;
/* Enable global interrupt */
sei();
/* Initialize lcd */
lcd_init();
while (1)
{
/* Infinite loop untill the push button is released. */
while(pw==0)
{
/* Check if the direction control push button is released. */
if(sw_dir == 0)
{
/* 1 0 to respective 1A 2A pins to rotate in clockwise direction. */
PORTA = 0b00000001;
/* Running clock wise direction */
lcd_out(1,1,"Motor ON- CL ");
}
else
{
/* 1 0 to respective 1A 2A pins to rotate in Anti-Clockwise direction. */
PORTA = 0b00000010;
lcd_out(1,1,"Motor ON- ACL");
}
/* i increases in ISR, the corresponding value is to be loaded into OCR0. */
OCR0 = i;
}
/* 0 0 to respective 1A 2A pins to Stop rotation. */
PORTA = 0x00;
lcd_out(1,1,"Motor is TURNOFF");
}
}
/* Interrupt service routine */
ISR(INT0_vect)
{
/* as i increases the duty cycle also increases. i increases by 20 in each push */
i=i+20;
}