Plant watering automation

plantwater.pde

#define MOTOR_PIN 3
#define SENSOR_VCC 9
#define SENSOR_MOISTURE A2
#define MOISTURE_THRESHOLD 700
#define SENSOR_WARMUP 1200
#define SAMPLE_DELAY 8000

void setup() {
  pinMode(SENSOR_VCC, OUTPUT);
  pinMode(MOTOR_PIN, OUTPUT);
  pinMode(SENSOR_MOISTURE, INPUT);
  Serial.begin(9600);
}

void loop() {
  digitalWrite(SENSOR_VCC, HIGH);
  delay(SENSOR_WARMUP);
  int mv;
  while(( mv = analogRead(SENSOR_MOISTURE)) > MOISTURE_THRESHOLD){ 
    Serial.print("Status: DRY\tmv: ");
    Serial.println(mv);
    digitalWrite(MOTOR_PIN, HIGH);
    delay(700);
    digitalWrite(MOTOR_PIN,LOW);
    delay(700);
  }
  digitalWrite(SENSOR_VCC, LOW);
  
  delay(SAMPLE_DELAY);
  Serial.print("Status: OK\tmv: ");
  
  Serial.println(mv);

}