Javascript Setup

Prerequisite MATRIX HAL

Make sure you have installed MATRIX HAL, before continuing.

JavaScript Setup

Install Node.js 

curl -o- https://raw.githubusercontent.com/creationix/nvm/v0.33.11/install.sh | bash
. ~/.bashrc
nvm install 13

Create a project folder. 

mkdir lite_js
cd lite_js
npm init -y
touch index.js

Download the matrix-lite-js package. 

npm install @matrix-io/matrix-lite --save

Creating An Application

Copy our Hello World example below into index.js to test your installation.

const matrix = require("@matrix-io/matrix-lite");

let everloop = new Array(matrix.led.length);

let ledAdjust = 0.0;
if (everloop.length == 35) {
    ledAdjust = 0.51; // MATRIX Creator
} else {
    ledAdjust = 1.01; // MATRIX Voice
}

let frequency = 0.375;
let counter = 0.0;
let tick = everloop.length - 1;

setInterval(()=>{
    // Create rainbow
    for(i = 0; i < everloop.length; i++) {
        let led = {};
        led.r = Math.round(Math.max(0, (Math.sin(frequency*counter+(Math.PI/180*240))*155+100)/10));
        led.g = Math.round(Math.max(0, (Math.sin(frequency*counter+(Math.PI/180*120))*155+100)/10));
        led.b = Math.round(Math.max(0, (Math.sin(frequency*counter)*155+100)/10));

        counter += ledAdjust;

        everloop[i] = led;
    };

    // Slowly show rainbow
    if (tick != 0) {
        for (i = tick; i > 0; i--) {
            everloop[i] = {};
        }
        tick--;
    }

    matrix.led.set(everloop);

},35);

Running index.js

Once you have index.js ready, use the following command to run our rainbow Hello World. 

node index.js

Result


Next Steps

With your device now setup, you can visit our Reference page to get started with MATRIX Lite.

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