int motor1=7;
int motor2=8;  

int pote=A1;   
 
int valorpote;     
int pwm1;          
int pwm2;          
 
void setup()
{
  
  pinMode(motor1,OUTPUT);
  pinMode(motor2, OUTPUT);
}
 
void loop()
 {
  
 
  
  valorpote=analogRead(pote);
  pwm1 = map(valorpote, 0, 1023, 0, 255);
  pwm2 = map(valorpote, 0, 1023, 255, 0); 
 
  
  analogWrite(motor1,pwm1);
  analogWrite(motor2,pwm2);
 
}