int pin = A1;
int last = 0;
bool a = false;
bool b = !a;
void setup(){
pinMode(7,OUTPUT);
pinMode(8,OUTPUT);
}

void loop() {
  int t = analogRead(pin)*5;
  if(millis()-last > t){
    b = a;
    a = !a;
    digitalWrite(7,a);
    digitalWrite(8,b);
    last = millis();
    }
}