ChainsawControl.ino

float pulsewidth = 10; // 1/100 a second
long count = 0;
long goal = 1024;

void setup() {
  pinMode(13, OUTPUT);
}

void loop() {
  delay(pulsewidth);
  count = 0;
  
  do {
    if(analogRead(A2) > 500) {
      goal = analogRead(A0);
    }
    delay(pulsewidth);
    count += 15;
  } while(count < goal);
  
  digitalWrite(13, HIGH);
  delay(pulsewidth);
  digitalWrite(13, LOW);
}