const int moistureAO = 0;
int AO = 0; // Pin connected to A0 on the controller
int tmp = 0; // Value of the analog pin
int buzzPin = 11; // Pin connected to the piezo buzzer
int LED = 13; // Pin connected to the LED
void setup () {
 Serial.begin(9600); // Send Arduino reading to IDE
 Serial.println("Soil moisture sensor");
 pinMode(moistureAO, INPUT);
 pinMode(buzzPin, OUTPUT); // Set pin as output
 pinMode(LED, OUTPUT); // Set pin as output
}
void loop () {
 tmp = analogRead( moistureAO );
 if ( tmp != AO ) {
 AO = tmp;
 Serial.print("A = "); // Show the resistance value of the sensor
 // in the IDE
 Serial.println(AO);
 }
 delay (1000);
 if (analogRead(0) > 900) { // If the reading is higher than 900,
 digitalWrite(buzzPin, HIGH); // the buzzer will sound
 digitalWrite(LED, HIGH); // and the LED will light
 delay(1000); // Wait for 1 second
 digitalWrite(buzzPin, LOW);
 digitalWrite(LED, HIGH);
 }
 else {
 digitalWrite(buzzPin, LOW); // If the reading is below 900,
 // the buzzer and LED stay off
 digitalWrite(LED, LOW);
 }
}