In my sketch main loop I used SoftwareSerial in order to read data from gps. void loop() { while (nss.available()) { if (gps.encode(nss.read())) { ... Also I have timer ISR, which is called every second or so, where I engage buzzer ISR(TIMER1_COMPA_vect) { tone(8, 1000, 200); // digitalW…

tone() and reading data from serial

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