int ledpin=5;
int mspin=1;    //ms=motion sensor pin;
int mspresent=LOW;   //motion sensor present state;
int msprevious=LOW;  //motion sensor old state;
void setup() {
Serial.begin(9600);
pinMode(mspin, INPUT);
pinMode(ledpin, OUTPUT);
}

void loop() {
msprevious=mspresent;
mspresent=digitalRead(mspin);

if(msprevious==LOW && mspresent==HIGH){
  Serial.println("Motion Detected");
  digitalWrite(ledpin, HIGH);
}
else
if (msprevious==HIGH && mspresent==LOW){
  Serial.println("Motion stopped");
  digitalWrite(ledpin, LOW);
}
}