// Minimal sketch from Arduino "Ping" example
// Modified for separate trig and echo pins
// Same pins used for all three examples
// Most recent cores as of April 4, 2014
// Arduino 1.8.13 on Linux Mint
const int trigPin = PIN_PA2;
const int echoPin = PIN_PA3;
long duration, inches, cm;

void setup() {
  Serial.begin(115200);
  delay(5000);  //  time to toggle display
  Serial.println("\n\n\n\t\tStartup AVR64DD14");
  //Serial.println("\n\n\n\t\tStartup ATTiny1616");
  //Serial.println("\n\n\n\t\tStartup ATtiny402");
  pinMode(trigPin, OUTPUT);
  pinMode(echoPin, INPUT);
}
void loop() {
  for (int n = 0; n < 10; n ++) {
    digitalWrite(trigPin, LOW);
    delayMicroseconds(2);
    digitalWrite(trigPin, HIGH);
    delayMicroseconds(5);
    digitalWrite(trigPin, LOW);
    duration = pulseIn(echoPin, HIGH);
    inches = microsecondsToInches(duration);
    cm = microsecondsToCentimeters(duration);
    Serial.print("\t");
    Serial.print(inches);
    Serial.print(" in\t");
    Serial.print(cm);
    Serial.print(" cm\t");
    Serial.print(duration);
    Serial.print(" duration\n");
    delay(50);
  }
  exit(0);
}
long microsecondsToInches(long microseconds) {
  return microseconds / 74 / 2;
}
long microsecondsToCentimeters(long microseconds) {
  return microseconds / 29 / 2;
}