A Unity MonoBehaviour implimentation of the Low Pass Filter as originally described by Thom Nichols

SimpleLowPassFilter.cs

using UnityEngine;
using System.Collections;

public class SimpleLowPassFilter : MonoBehaviour 
{
    // time smoothing constant for low-pass filter 0 ≤ alpha ≤ 1
    // a smaller value basically means more smoothing.

    public float ALPHA = 0.15f;  

    // See: http://en.wikipedia.org/wiki/Low-pass_filter#Discrete-time_realization
    // see http://en.wikipedia.org/wiki/Low-pass_filter#Algorithmic_implementation

    // Store for current/smoothed values to apply on the next 
    // iteration

    private float[] compassVals = new float[3];

	void Start () 
    {
	
	}

    void Update()
    {
        // Generate some dummy values

        float[] currentVals = new float[3] { Random.Range(0, 255), Random.Range(0, 255), Random.Range(0, 255) };

        // Apply the filter

        compassVals = LowPassFilter(currentVals, compassVals);

        print(compassVals[0].ToString() + "," + compassVals[1].ToString() + "," + compassVals[2].ToString());
    }

    public float[] LowPassFilter(float[] input, float[] output)
    {
        if (output == null) return input;

        for (int i = 0; i < input.Length; i++)
        {
            output[i] = output[i] + ALPHA * (input[i] - output[i]);

            // output[i] = Mathf.Round(output[i]);
        }

        return output;
    }
}

// <copyright file="SimpleLowPassFilter.cs" company="dyadica.co.uk">
// Copyright (c) 2010, 2014 All Right Reserved, http://www.dyadica.co.uk
 
// This source is subject to the dyadica.co.uk Permissive License.
// Please see the http://www.dyadica.co.uk/permissive-license file for more information.
// All other rights reserved.
 
// THIS CODE AND INFORMATION ARE PROVIDED "AS IS" WITHOUT WARRANTY OF ANY
// KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND/OR FITNESS FOR A
// PARTICULAR PURPOSE.

// </copyright>
 
// <author>SJB</author>
// <email>contact via facebook.com/adropinthedigitalocean</email>
// <date>29.10.2014</date>
// <summary>A Unity MonoBehaviour implimentation of the Low Pass Filter as originally described by Thom Nichols.
// Based on and using code from: http://blog.thomnichols.org/2011/08/smoothing-sensor-data-with-a-low-pass-filter.
// all kudos to Thom Nichols!
// </summary