int pwmPin = 0;
int analogInPin = A1;
int cutoff = 1;

void setup() {
  // put your setup code here, to run once:
  pinMode(pwmPin, OUTPUT);
  pinMode(analogInPin, INPUT);
  pinMode(cutoff, INPUT);
}

void loop() {
int CutoffValue = (digitalRead(cutoff));

if(CutoffValue == LOW){
    int analogIn = analogRead(analogInPin); 
    if (analogIn > 400){  digitalWrite(pwmPin,HIGH);    }
    else{   digitalWrite(pwmPin,LOW);}
    // analogWrite(pwmPin, analogIn / 4);
}
else
  digitalWrite(pwmPin,LOW);
}