| int buzzer = D1 ; | |
| void setup () | |
| { | |
| pinMode (buzzer, OUTPUT) ; | |
| } | |
| void loop () | |
| { | |
| digitalWrite (buzzer, HIGH) ; | |
| delayMicroseconds(500); ; | |
| digitalWrite (buzzer, LOW) ; | |
| delayMicroseconds(500); ; | |
| } |
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