Keyestudio KS0436 Kit Manual page 70

70
What about active buzzer?
The use method is almost the same.
Think about it and try to make an audible beep from active buzzer.
Test code is showed below:
int buzzer=2;// initialize digital IO pin that controls the buzzer
void setup()
{
pinMode(buzzer,OUTPUT);// set pin mode as "output"
}
void loop()
{
digitalWrite(buzzer, HIGH); // produce sound
}
From the test code, we can know the buzzer's positive lead (long lead)