int pirms = 2;
int led = 4;
int value = LOW;
int toggle = HIGH;

void setup() {
  pinMode(pirms, INPUT);
  pinMode(led, OUTPUT);
  Serial.begin(9600);
}

void loop() {
  value = digitalRead(pirms);
  if (value == HIGH) {
    digitalWrite(led, HIGH);
    if (toggle == HIGH) {
      Serial.println("Motion detected!");
      toggle = LOW;
    }
  } else {
    digitalWrite(led, LOW);
    if (toggle == LOW) {
      Serial.println("Motion ended!");
      toggle = HIGH;
    }
  }
}

//  reference = https://wokwi.com/projects/299284655047180808