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 Problems about Controlling DC motor
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milk1995
New Member

3 Posts

Posted - Aug 23 2017 :  04:16:36 AM  Show Profile  Reply with Quote
Greetings~
I am confusing about controlling DC motor by L298N. My program is as following:
#include <reg51.h>
#define uchar unsigned char†
#define uint unsigned int
sbit ENA=P1^2;
sbit IN1=P1^3;
sbit IN2=P1^4;
sbit ENB=P1^5;
sbit IN3=P1^6;
sbit IN4=P1^7;

uint MA=0;††
uint speedA=50;
int flag=0;

void timeinit()
{
† † TMOD=0x01;
† † TH0=(65536-10000)/256;
† † TL0=(65536-10000)%256;
† † EA=1;
† † ET0=1;
† † TR0=1;
}

void Ques1()
{
† † switch(flag/10)
† † {
† †† †††case 0: TR0=0;
† †† †† †† †† †† †† †† †if(MA<speedA)
† †† †† †† †† †† †† †† †{
† †† †† †† †† †† †† †† †† †† †††ENA=1;ENB=1;
† †† †† †† †† †† †† †† †† †† †††IN1=1;IN2=0;
† †† †† †† †† †† †† †† †† †† †††IN3=0;IN4=1;
† †† †† †† †† †† †† †† †}
† †† †† †† †† †† †† †† †else
† †† †† †† †† †† †† †† †{
† †† †† †† †† †† †† †† †† † if(speedA<=MA<100)†
† †† †† †† †† †† †† †† †† † {
† †† †† †† †† †† †† †† †† †† †† †† †ENA=0;
† †† †† †† †† †† †† †† †† †† †† †† †ENB=0;
† †† †† †† †† †† †† †† †† † }
† †† †† †† †† †† †† †† †† † else† †
† †† †† †† †† †† †† †† †† † {
† †† †† †† †† †† †† †† †† †† †† †† †MA=0;† †
† †† †† †† †† †† †† †† †† †† †† †† †flag++;† †† †† †† †† †† †† †† †† †† †† †† †† †† †† †† †† †† †† †† †† †† †† †
† †† †† †† †† †† †† †† †† † }† †† †† †† †† †† †† †† †† †
† †† †† †† †† †† †† †† †}
† †† †† †† †† †† †† †† †TR0=1;
† †† †† †† †† †† †† †† †break;
† †† †††case 1: TR0=0;
† †† †† †† †† †† †† †† †if(MA<speedA)
† †† †† †† †† †† †† †† †{
† †† †† †† †† †† †† †† †† †† †††ENA=1;ENB=1;
† †† †† †† †† †† †† †† †† †† †††IN1=0;IN2=1;
† †† †† †† †† †† †† †† †† †† †††IN3=1;IN4=0;
† †† †† †† †† †† †† †† †}
† †† †† †† †† †† †† †† †else
† †† †† †† †† †† †† †† †{
† †† †† †† †† †† †† †† †† † if(speedA<=MA<100)†
† †† †† †† †† †† †† †† †† † {
† †† †† †† †† †† †† †† †† †† †† †† †ENA=0;
† †† †† †† †† †† †† †† †† †† †† †† †ENB=0;††
† †† †† †† †† †† †† †† †† † }
† †† †† †† †† †† †† †† †† † else
† †† †† †† †† †† †† †† †† † {
† †† †† †† †† †† †† †† †† †† †† †† †MA=0;† †
† †† †† †† †† †† †† †† †† †† †† †† †flag++;† †† †† †† †† †† †† †† †† †††
† †† †† †† †† †† †† †† †† † }† †
† †† †† †† †† †† †† †† †}
† †† †† †† †† †† †† † TR0=1;
† †† †† †† †† †† †† †† †break;
† †† †††default : flag=0;
† †† †† †† †† †† †† †† †† † break;
† † }
}

void time0() interrupt 1
{
† † TH0=(65536-10000)/256;
† † TL0=(65536-10000)%256;
† † MA++;† †
}

void main()
{† †
† † timeinit();
† † while(1)
† † {
† †† †††Ques1();
† † }
}
This is the datasheet of L298N: http://www.kynix.com/uploadfiles/pdf9675/L298N.pdf .
Why canít this program control positive and negative rotation of motor at the same time. Now my question is the motor controlled by IN1 and IN2 work after pressing RESET,and the motor controlled by IN3 and IN4 will stop rotating after 5 seconds. Why? ? #65311;
Your help will be appreciated!

Aaron Cake
Administrator

Canada
6699 Posts

Posted - Aug 24 2017 :  09:03:48 AM  Show Profile  Visit Aaron Cake's Homepage  Send Aaron Cake an ICQ Message  Send Aaron Cake a Yahoo! Message  Reply with Quote
What microcontroller is this for?

You can't rotate a motor positive and negative at the same time. That would just lock the shaft.
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