Use MCS + firmata to control LED

Prerequisite

Please finish [previous chapters]/content/en/cloud/MCSjs.md).

Circuit Diagram

Please connect the hot wire of LED to D13.

Steps

MCU Side

• Open Arduino IDE
• copy the code from this site https://gist.github.com/edgarsilva/e73c15a019396d6aaef2
• Burn the code into Arduino

MPU Side

• Confirm the connection to LinkIt smart 7688.
• ssh into it.
• Replace the previous content of app.js with the following:

var ledPin = 13;
var firmata = require('firmata');
var mcs = require('mcsjs');
var board = new firmata.Board("/dev/ttyS0", function(err) {
    if (err) {
        console.log(err);
        board.reset();
        return;
    }
    console.log('connected...');
    console.log('board.firmware: ', board.firmware);
    board.pinMode(ledPin, board.MODES.OUTPUT);
    var myApp = mcs.register({
        deviceId: 'Input your deviceId',
        deviceKey: 'Input your deviceKey',
    });
    myApp.on('LED_control', function(data, time) {
        console.log('blink');
        console.log(data);
        if(Number(data) === 1){
            board.digitalWrite(ledPin, board.HIGH);
        } else {
            board.digitalWrite(ledPin, board.LOW);
        }
    });
});

• Save file, and run node app.
• Press the switch in MCS, and the LED will change with it.
• We have done here!