Simple Tone Arduino-ESP8266

Simple tone using Arduino ESP8266

Using digital pin D3 and D4

void setup() {
// initialize digital pin as an output.
pinMode(D3, OUTPUT);
pinMode(D4, OUTPUT);
}

void loop() {
digitalWrite(D3, HIGH);
tone(D4,1000, 500);
delay(500); // wait for a second
digitalWrite(D3, LOW);
noTone(D4);
delay(500); // wait for a second
}