/**
   HC-SR04 Distance Sensor Example
   https://wokwi.com/arduino/projects/304444938977804866
*/

#define PIN_TRIG 3
#define PIN_ECHO 2
#define TONE_USE_INT
#define TONE_PITCH C3. 1000
#define TONE_PITCH C5. 1000

int red = 12; //COMMENT Establish red as my led.

void setup() {
  Serial.begin(115200);
  pinMode(PIN_TRIG, OUTPUT);
  pinMode(PIN_ECHO, INPUT);
   pinMode(red, OUTPUT); //red is an output
   pinMode(5, OUTPUT);
}

void loop() {
  // Start a new measurement:
  digitalWrite(PIN_TRIG, HIGH);
  delayMicroseconds(10);
  digitalWrite(PIN_TRIG, LOW);
digitalWrite(red, LOW);
tone(5, A3, 1000);
delay(1000);
  // Read the result:
  int duration = pulseIn(PIN_ECHO, HIGH);
  Serial.print("Distance in CM: ");
  Serial.println(duration / 58);
  Serial.print("Distance in inches: ");
  Serial.println(duration / 148);
  digitalWrite(red, HIGH);
  tone(5, A5, 1000);

  delay(1000);
}
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