int i=1;
int p=1;
unsigned long previousMillis=0;
void setup() {
pinMode(3, OUTPUT);
Serial.begin(115200);}
void loop() {
unsigned long currentMillis=millis();
if(currentMillis-previousMillis>=1){
p=(i==255 || i==0?-p:p);
i=i+p;
analogWrite(3,i);
previousMillis=currentMillis;
}
Serial.println("ahoj "+String(i));}