moving-average-filter.ino

/*
* Project moving-average-filter
* Description: Filters out noise
* Author: Brett Balogh
* Date: April 29, 2017
* Copyright: CC-BY-SA-NC
*/
#define SENSOR_PIN 0

const int numValues = 100

int values[numValues];

int sensorValue = 0;

int sumValues = 0;

int averageValue = 0;

void setup(){
    // Start serial port for debugging
    Serial.begin(9600);

    // Initialize values of array
    for(int i = 0; i < arraySize(values); i++){
        values[i] = 0;
    }
}

void loop(){

    // Read the sensor
    sensorValue = analogRead(SENSOR_PIN);

    // pop the new value on the front of the array
    values[0] = sensorValue;

    // Shift values in array 1 position to the right
    // Pops oldest value (highest index) in array off
    for(int i = arraySize(values)-1; i > 0; i--){
        values[i]=values[i-1];
    }

    // Sum all values inthe array
    sumValues = 0;
    for(int i = 0; i < arraySize(values); i++){
        sumValues = sumValues+values[i];
}

    // Calculate average
    averageValue = sumValues/arraySize(values);

    // Debug
    Serial.print("sensorValue: ");
    Serial.print(sensorValue);
    Serial.print(" averageValue: ");
    Serial.println(averageValue);
}