#define led A1
#define pir 10
#define relay 4
#define  cbas A0
void setup() {
  // put your setup code here, to run once:
  pinMode(led, OUTPUT);
  pinMode(pir, INPUT);
  pinMode(relay, OUTPUT);
  pinMode(cbas, INPUT);

}

void loop() {
  // put your main code here, to run repeatedly:
  int cb = digitalRead(pir);
  int cbas1 = analogRead(cbas);
  if(cb == 1){
    analogWrite(led, cbas1/4);
    digitalWrite(relay, HIGH);
  } else{
    analogWrite(led, 0);
    digitalWrite(relay, LOW);
  }

}