int volt = 0;
int threshold = 160;
void setup() {
  // put your setup code here, to run once:
pinMode(10, OUTPUT);
pinMode(6, INPUT_PULLUP);
}

void loop() {
  // put your main code here, to run repeatedly:
  volt = analogRead(6);
  volt = map(volt,200,400,0,255);
  analogWrite(10, volt);

}