unsigned long now;
unsigned int counter;

# define RATE 10000

void setup() {
//  Serial.begin(115200);
//  Serial.println("hi Mom!");

}

void loop() {
  static unsigned long lastTime;
  now = millis();
// loop rate


// once per
  if (now - lastTime < RATE) return;
  lastTime = now;

//  Serial.println(counter); counter++;
}