fadey_button.ino

#include "InternetButton/InternetButton.h"
#include "math.h"

/*Did you know that the SparkButton can detect if it's moving? It's true!
Specifically it can read when it's being accelerated. Recall that gravity
is a constant acceleration and this becomes very useful- you know the orientation!*/

#define AVG_COUNT 50.0
#define ARR_SIZE 50
int idx = 0;
float xArr[ARR_SIZE], yArr[ARR_SIZE], zArr[ARR_SIZE];
float avgX = 0, avgY = 0, avgZ = 0;

InternetButton b = InternetButton();

void setup() {
    //lastX = lastY = lastZ = 0;
    
    //Tell b to get everything ready to go
    // Use b.begin(1); if you have the original SparkButton, which does not have a buzzer or a plastic enclosure
    // to use, just add a '1' between the parentheses in the code below.
    b.begin();
}

void loop(){
    

    //How much are you moving in the x direction? (look at the white text on the board)
    float xValue = abs(b.readX());

    //How about in the y direction?
    float yValue = abs(b.readY());

    //And the z!
    float zValue = abs(b.readZ());
    
    
    //
    //  Calculate the moving average of the last 50 readings
    //
    
    xArr[idx % ARR_SIZE] = xValue;
    yArr[idx % ARR_SIZE] = yValue;
    zArr[idx % ARR_SIZE] = zValue;
    idx++;
    
    avgX = avgY = avgZ = 0;
    for(int i=0;i<ARR_SIZE;i++) {
        avgX += xArr[i];
        avgY += yArr[i];
        avgZ += zArr[i];
    }
    avgX /= AVG_COUNT;
    avgY /= AVG_COUNT;
    avgZ /= AVG_COUNT;
    
    //
    //  Subtract the average from the current reading.
    //  This should cause the lights to fade to off as the button stops moving
    //
    xValue = avgX - xValue;
    yValue = avgY - yValue;
    zValue = avgZ - zValue;


    //This will make the color of the Button change with what direction you shake it
    //The abs() part takes the absolute value, because negatives don't work well
    b.allLedsOn(abs(xValue), abs(yValue), abs(zValue));

    //Wait a mo'
    // Since we're delaying 50 ms, we're taking 20 readings a second.
    // Since we're holding 50 points, we'll fade over a period of about 2.5 seconds.
    delay(50);
}