help a poor beginner

Forum 2005-2010 (read only) Software Syntax & Programs
1

I have an arduino romeo with 1 elektro motor and I would ask for help about if you could point me to how I can make this code from 2 motors that are requiered to 1.What I am trying to achieve is that when I press on my keyboard A or D for the motor to rotate left or right but I failed to make it work so here is a sample code

Sample Code:

int E1 = 5; //M1 Speed Control
int E2 = 6; //M2 Speed Control
int M1 = 4; //M1 Direction Control
int M2 = 7; //M1 Direction Control

void stop(void) //Stop

digitalWrite(E1,LOW);
digitalWrite(E2,LOW);
}
void advance(char a,char b) //Move forward
{
analogWrite (E1,a); //PWM Speed Control
digitalWrite(M1,HIGH);
analogWrite (E2,b);
digitalWrite(M2,HIGH);
}
void back_off (char a,char b) //Move backward
{
analogWrite (E1,a);
digitalWrite(M1,LOW);
analogWrite (E2,b);
digitalWrite(M2,LOW);
}
void turn_L (char a,char b) //Turn Left
{
analogWrite (E1,a);
digitalWrite(M1,LOW);
analogWrite (E2,b);
digitalWrite(M2,HIGH);
}
void turn_R (char a,char b) //Turn Right
{
analogWrite (E1,a);
digitalWrite(M1,HIGH);
analogWrite (E2,b);
digitalWrite(M2,LOW);
}
void setup(void)
{
int i;
for(i=6;i<=9;i++)
pinMode(i, OUTPUT);
Serial.begin(19200); //Set Baud Rate
}
void loop(void)
{
char val = Serial.read();
if(val!=-1)
{
switch(val)
{
case 'w'://Move Forward

advance (100,100); //PWM Speed Control
break;
case 's'://Move Backward
back_off (100,100);
break;
case 'a'://Turn Left
turn_L (100,100);
break;
case 'd'://Turn Right
turn_R (100,100);
break;
}
delay(40);
}
else stop();
}

2

Does the hardware work? In other words, have you tried a simple sketch that simply spins the motor one way, then the other?

3

I don't see how this even compiles:

void stop(void)                    //Stop




digitalWrite(E1,LOW);    
         digitalWrite(E2,LOW);       
       }
4

well the main problem is that I don't know from where to begin.I know that I should go for something simpler but I have a few day till deadline to build an automatic slide door and the code is the only thing that troubles me

5

A simple sketch to turn the motor on going one way, then turn it off should be easy enough. When that works, add a few more statements to make it turn the other way, then stop.

How are you powering the electric motor? Are you using some kind of shield? An H-Bridge?

Moving a door, unless it's a small cardboard door, is going to require a good size motor, which is not going to be driven bi-directionally using just the Arduino. It will require some additional hardware.

6

Setting the correct pins to be outputs would be a start.

Take a deep breath, slow down and work on powering just one motor.
Work out how you did it, and the second will come easily.