talkToArduino.js

gistfile1.txt

///////////////////////////////////////////////////INITIALIZE VARIABLES
var express = require('express')
const url = require('url');
var app = express()
var SerialPort = require("serialport");
var path = require('path');
var server = require('http').createServer(app);
var io = require('socket.io')(server);
var port = process.env.PORT || 3000;
const Readline = require('@serialport/parser-readline');
const portSerial = new SerialPort('/dev/cu.SLAB_USBtoUART', { baudRate: 9600 });
///////////////////////////////////////////////////INITIALIZE VARIABLES


///////////////////////////////////////////////////PAGE RENDERING
app.use(express.static(__dirname + '/views'));

server.listen(3000, "192.168.1.161",function listening() {
  console.log('Listening on %d', server.address().port);
});

app.get('/', function (req, res) {
  res.sendFile('index.html');
})
///////////////////////////////////////////////////PAGE RENDERING


///////////////////////////////////////////////////BACKEND SERVER LOGIC
const parser = portSerial.pipe(new Readline({ delimiter: '\n' }));
// Read the port data
portSerial.on("open", () => {
  console.log('serial port open');
});
parser.on('data', data =>{
  console.log('got word from arduino:', data);
});

 io.on('connection', socket => {
   socket.on('1', function(){
     console.log("1 caught");
     portSerial.write('Z', (err) => {
        if (err) {
          return console.log('Error on write: ', err.message);
        }
        console.log('message written');
      });
   });

    socket.on('2', function(){
      console.log("2 caught");
      portSerial.write('B', (err) => {
         if (err) {
           return console.log('Error on write: ', err.message);
         }
         console.log('message written');
       });
    });
    socket.on('3', function(){
      console.log("3 caught");
      portSerial.write('C', (err) => {
         if (err) {
           return console.log('Error on write: ', err.message);
         }
         console.log('message written');
       });
    });
    socket.on('4', function(){
      console.log("4 caught");
      portSerial.write('D', (err) => {
         if (err) {
           return console.log('Error on write: ', err.message);
         }
         console.log('message written');
       });
    });
});
///////////////////////////////////////////////////BACKEND SERVER LOGIC