ESP8266 Community Forum

- Sat Aug 27, 2016 1:21 pm #53924 We have a rather successful setup with an ESPDuino + RFID + relay + I2c display + active buzzer, the only odd thing is that we cannot get the buzzer going again after the setup call for lcd.begin()

See code below : during setup the buzzer beeps loudly for 500 msec, but as soon as the lcd.begin() call is made any digitalWrite call to get the buzzer going ends up in a very soft chirp. Furthermore when counting in a loop and updating the lcd the buzzer chirps softly while the GPIO5 (buzzer) is not addressed at all

The buzzer vcc is hooked up to 3.3 volts. the board is an ESPduino by DOIT

Code: Select allMFRC522 mfrc522(SS_PIN, RST_PIN);

void setup() {
  pinMode(BUZZER, OUTPUT);
  pinMode(RELAY, OUTPUT);
  digitalWrite(RELAY, LOW);
 // USE_SERIAL.begin(115200);
  digitalWrite(BUZZER, HIGH); delay(500);digitalWrite(BUZZER, LOW);
  WiFiMulti.addAP("xxxxxxxxxxxxx", "xxxxxxxxxxxxxx");
  SPI.begin();      // Init SPI bus
  mfrc522.PCD_Init(); // Init MFRC522 card
  digitalWrite(RELAY, HIGH);delay(300);digitalWrite(RELAY, LOW);
  lcd.begin();
  lcd.backlight();
  lcd.setCursor(0, 0);
  lcd.print("Laser 'VERA' ");
}