int pwmPin1 = 0; 
int pwmPin2 = 1;
int pot = A1; // assigns analog input A1 to variable pot
int c1 = 0;   // declares variable c1
int c2 = 0;   // declares variable c2
//int min=108;
//int max=139;

void setup()  // setup loop
{
  pinMode(pwmPin1, OUTPUT); 
  pinMode(pwmPin2, OUTPUT); 
  pinMode(pot, INPUT);  
}

void loop()
{
 // c2= map(analogRead(pot), min, max, 0,1000); 
  c2=analogRead(pot);
  c1= 1000-c2;         // subtracts c2 from 1000 ans saves the result in c1
  digitalWrite(pwmPin1, HIGH); 
  digitalWrite(pwmPin2, HIGH); 
  delayMicroseconds(c1);   
  digitalWrite(pwmPin1, LOW);  
  digitalWrite(pwmPin2, LOW);
  delayMicroseconds(c2);  
}