Interfacing Stepper Motor with Starter AVR Using A4988 Revision as of 13:13, 14 April 2016 by Vaibhav Katkar (Talk | contribs) (diff) ← Older revision | Latest revision (diff) | Newer revision → (diff)

In this tutorial we'll interface stepper motor with Starter AVR board using A4988 driver. For driving one stepper motor, one A4988 driver is required. A4988 has inbuilt translator so we can control this driver by just two pins, one for direction and one for controlling the steps.

Basic

Hookup

Code

	#include <avr/io.h>
	#include "delay.h"
	#define stepPin PD7 //Define Step pin
	#define dirPin PD6 //Define Direction pin
	#define Enable PD5 //Define Enable pin
	int main(void)
	{
	int x,y;
	DDRD |= (1<<5)|(1<<6)|(1<<7); // Configure PORTD5, PORTD6, PORTD7 as output
	PORTD &= ~(1<<5); // Enable driver
	while (1)
	{
	PORTD |= (1<<6); //Make PORTD6 high to rotate motor in clockwise direction
	for(x=0; x<4; x++) //Give 50 pulses to rotate stepper motor by 90 degree's in full step mode
	{
	for(y=0; y<50; y++)
	{
	PORTD |=(1<<7);
	DELAY_us(700);
	PORTD &=~(1<<7);
	DELAY_us(700);
	}
	DELAY_ms(1000);
	}
	PORTD &= ~(1<<6); //Make PORTD6 high to rotate motor in anti-clockwise direction
	for(x=0; x<4; x++) //Give 50 pulses to rotate stepper motor by 90 degree's in full step mode
	{
	for(y=0; y<50; y++)
	{
	PORTD |=(1<<7);
	DELAY_us(700);
	PORTD &=~(1<<7);
	DELAY_us(700);
	}
	DELAY_ms(1000);
	}
	}
	}

view raw stepper.c hosted with ❤ by GitHub

Demo

For full demo video visit our youtube channel https://www.youtube.com/watch?v=fYsiDZhr1ZU&feature=youtu.be