Page 214 - 최강 아두이노 퍼스트 참고서

/*macro definition of water sensor and the buzzer*/
#define WATER_SENSOR 2
#define BUZZER 3 void
setup()
{
pins_init();
} void loop()
{
if(isExposedToWater()) soundAlarm();
}
void pins_init()
{
pinMode(WATER_SENSOR, INPUT);

pinMode(BUZZER, OUTPUT);
}
/*****************************************************************
*******/
/*Function: When the sensor is exposed to the water, the buzzer sounds */
/* for 2 seconds.
*/
void soundAlarm()
{
for(uint8_t i = 0;i < 20;i ++)
{
digitalWrite(BUZZER, HIGH); delay(50);
digitalWrite(BUZZER, LOW);
delay(50);
}
}
/*****************************************************************
*******/
/*Function: Determine whether the sensor is exposed to the water */
/*Parameter:-void
*/
/*Return: -boolean,if it is exposed to the water,it will return true. */ boolean
isExposedToWater()
{
if(digitalRead(WATER_SENSOR) == LOW)
return true; else return false;
}

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