void setup() {
pinMode(LED_BUILTIN, OUTPUT);
Serial.begin(115200);
// initialize the measurement
TCCR1B = bit(CS10);
TCNT1 = 0;
digitalWrite(LED_BUILTIN, HIGH);
// take the measurement
unsigned int cycles = TCNT1;
// print the result
Serial.println(cycles);
}
void loop() {
// delay(1000);
//digitalWrite(LED_BUILTIN, LOW);
//delay(1000);
}