arduino-irmeter/SharpDistance_v0.ino

#define sensorPin A1 // Sharp 2Y0A21 sensor (10 to 80 cm)
#define numReadings 10 // Number of readings to average for the moving average

int readings[numReadings]; // Array to store the readings
int readIndex = 0; // Index of the current reading
int total = 0; // Sum of the readings
int average = 0; // Average of the readings

void setup() {
  Serial.begin(9600);
  pinMode(sensorPin, INPUT);
  for (int i = 0; i < numReadings; i++) {
    readings[i] = 0; // Initialize the readings array
  }
}

void loop() {
  // Subtract the last reading
  total = total - readings[readIndex];

  // Read the raw analog value
  int rawValue = analogRead(sensorPin);

  // Calculate distance using the formula
  int distance = 123.221814 * exp(-0.005895 * rawValue);

  // Add the current reading to the total
  total = total + distance;

  // Store the reading in the array
  readings[readIndex] = distance;

  // Advance to the next position in the array
  readIndex = readIndex + 1;

  // If we're at the end of the array, wrap around to the beginning
  if (readIndex >= numReadings) {
    readIndex = 0;
  }

  // Calculate the average
  average = total / numReadings;

  // Print the raw analog value and the averaged distance to the Serial Monitor
  Serial.print("Raw Value: ");
  Serial.print(rawValue);
  Serial.print(", Distance: ");
  Serial.print(average);
  Serial.println(" cm");

  delay(250); // Approximately 250 ms delay
}