//PWM frequency gneretor with different BAUD RATE 26_09_2016 10:09am unsigned int pin = 3; unsigned int pinA = 6; void setup() { pinMode(3, OUTPUT); pinMode(6, OUTPUT); Serial.begin(9600); } void loop() { tone(pin, 150); delay(4000); noTone(pin); delay(200); tone(pinA, 300); delay(2000); noTone(pinA); delay(2000); if (pin > 200) { Serial.flush(); Serial.begin(57600); delay(400); } else if (pinA <= 200) { Serial.flush(); Serial.begin(19200); } else { } delay(400); }