basic_send.ino

uint8_t value = 0;
const int LEDPIN = 11;

void setup() {
  // put your setup code here, to run once:
  Serial.begin(9600);
  pinMode(LEDPIN, OUTPUT);
  pinMode(LED_BUILTIN, OUTPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
  value = (value + 10) % 255;

  analogWrite(LEDPIN, value);
  Serial.write(value);
  
  delay(100); 

  if (millis() % 1000 > 900) digitalWrite(LED_BUILTIN, HIGH);
  else digitalWrite(LED_BUILTIN, LOW);
}