Serial giving wrong values

[bomdom69]

const int moisturePin = A1; // Pin connected to the soil moisture sensor
const int relayPin = 7;     // Pin connected to the relay

// Define calibration values
const int dryValue = 700;   // Analog reading when sensor is dry
const int wetValue = 300;   // Analog reading when sensor is wet

void setup() {
  // Initialize serial communication
  Serial.begin(9600);
  
  // Set pin modes
  pinMode(moisturePin, INPUT);
  pinMode(relayPin, OUTPUT);
}

void loop() {
  // Read soil moisture
  int moisture = analogRead(moisturePin);
  
  // Convert analog reading to moisture percentage using calibration values
  int moisturePercentage = map(moisture, dryValue, wetValue, 0, 100);
  
  // Print moisture value to serial monitor
  Serial.print("Moisture Percentage: ");
  Serial.println(moisturePercentage);
  
  // Check if soil moisture exceeds wet threshold
  if (moisture <= wetValue) {
    // If moisture is below wet threshold, turn on relay
    digitalWrite(relayPin, HIGH);
    Serial.println("Soil moisture is high. Turning relay on.");
  } else {
    // Otherwise, turn off relay
    digitalWrite(relayPin, LOW);
    Serial.println("Soil moisture is low. Turning relay off.");
  }
  
  // Delay for stability
  delay(1000);
}

The relay keeps activating even when the sensor isnt connected and the monitor is giving random values. Whats wrong?

[bomdom69]

if i plug it in i get this:

[mancera1979]

What kind of relay are you using?