testmotor.ino
int m1_1 = 4;
int m1_2 = 5;
int m1_pwm = 6;
int m2_1 = 7;
int m2_2 = 8;
int m2_pwm = 9;

int speed1 = 100;
int speed2 = -100;


void setup(){
	pinMode(m1_1,OUTPUT); 
	pinMode(m1_2,OUTPUT); 
	pinMode(m1_pwm,OUTPUT); 
	pinMode(m2_1,OUTPUT); 
	pinMode(m2_2,OUTPUT); 
	pinMode(m2_pwm,OUTPUT); 

	Serial.begin(9600);
}

void loop(){

  if(speed1>255) {
  	speed1=255;	
  	} else if(speed1<-255){
  	speed1=-255;	
  	} else if(speed1==0){
  	speed1=0;	
  }

  if(speed2>255) {
  	speed2=255;	
  	} else if(speed2<-255){
  	speed2=-255;	
  	} else if(speed2==0){
  	speed2=0;	
  }

  analogWrite(m1_pwm,speed1);
  analogWrite(m2_pwm,speed2);

  if(speed1>0){
	  digitalWrite(m1_1,HIGH);
	  digitalWrite(m1_2,LOW);
  } else if(speed1<0){
	  digitalWrite(m1_1,LOW);
	  digitalWrite(m1_2,HIGH);
  } else if(speed1==0){
	  digitalWrite(m1_1,LOW);
	  digitalWrite(m1_2,LOW);
  }
  
  if(speed2>0){
	  digitalWrite(m2_1,HIGH);
	  digitalWrite(m2_2,LOW);
  } else if(speed2<0){
	  digitalWrite(m1_1,LOW);
	  digitalWrite(m2_1,LOW);
	  digitalWrite(m2_2,HIGH);
  } else if(speed2==0){
	  digitalWrite(m2_1,LOW);
	  digitalWrite(m2_2,LOW);
  }
 
}