Design an Automatic Power on OFF system using Arduino Uno and Relay module

[cksajil]

1. Connect rain sensor and relay module to the Arduino Uno board
2. Sample Arduino script would look like the following

[cksajil]

const int relayPin = 3;       // Pin connected to the relay module

void setup() {
  pinMode(rainSensorPin, INPUT);
  pinMode(relayPin, OUTPUT);
  digitalWrite(relayPin, LOW); // Ensure the relay is initially off
}

void loop() {
  int sensorValue = digitalRead(rainSensorPin);

  if (sensorValue == LOW) { // Rain detected
    digitalWrite(relayPin, HIGH); // Turn on relay (and thus the Raspberry Pi)
  } else {
    // Add delay functionality so that the Pi turns off itself based on inference values after some time
    digitalWrite(relayPin, LOW); // Turn off relay (and thus the Raspberry Pi)
  }

  delay(1000); // Check every second
}