twitch-plays-plotter/app.js

const { SerialPort } = require('serialport')
const express = require('express')
const bodyParser = require('body-parser')
const app = express()
const movement = 1000;

// Create a port
const port = new SerialPort({
    path: '/dev/ttyUSB0',
    baudRate: 9600,
})

// app.use(bodyParser.json());

const toPlotter = (message) => {
    console.log("i will write to plotter ", message);
    port.write(message, function (err) {
        if (err) {
            return console.log('Error on write: ', err.message)
        }
        console.log('message written: ', message)
    })
}

// Open errors will be emitted as an error event
port.on('error', function (err) {
    console.log('Error: ', err.message)
})

port.on("open", function () {
    console.log('open');
    port.on('data', function (data) {
        console.log(data);
    });
});

app.post('/init', (req, res) => {
    toPlotter(`IN;SC0,0,100,0,100;SP1;PA60,60;PU`)
    res.send('Initialise the plotter')
})

app.post('/pen-up', (req, res) => {
    toPlotter(`PU;`);
    res.send("Sending a message to the plotter about PU;",)
});


app.post('/pen-down', (req, res) => {
    toPlotter(`PD;`);
    res.send("Sending a message to the plotter about PD;",)
});


app.post('/move-left', (req, res) => {
    toPlotter(`PR-${movement},0;`);
    res.send("Sending a message to the plotter about PR-10,0;",)
});


app.post('/move-right', (req, res) => {
    toPlotter(`PR${movement},0;`);
    res.send("Sending a message to the plotter about PR10,0;",)
});


app.post('/move-up', (req, res) => {
    toPlotter(`PR0,${movement},0;`);
    res.send("Sending a message to the plotter about PR0,10;",)
});


app.post('/move-down', (req, res) => {
    toPlotter(`PR0,-${movement};`);
    res.send("Sending a message to the plotter about  PR0,-10;",)
});


// GET /text?message={message}
app.post('/text', (req, res) => {
    toPlotter(`SI0.5,0.8;LB${req.query.message};`);
    res.send(`SI0.5,0.8;LB${req.query.message};`)
});

// GET /direct?message={message}
app.post('/direct', (req, res) => {
    toPlotter(`${req.query.message}`);
    res.send(`${req.query.message}`)
});

app.use(express.static('public'))

app.listen(3000, () => {
    console.log(`Example app listening on port`)
})

const tmi = require('tmi.js');

const client = new tmi.Client({
	channels: [ 'twitchplaysplotter' ]
});

client.connect();

client.on('message', (channel, tags, message, self) => {

	console.log(`${tags['display-name']}: ${message}`);

  switch ( message.toLowerCase() ) {
    case 'pu':
    console.log("Performing a PU");
    break;
    case 'pd':
    console.log("Performing a PD");
    break;
    case 'up':
    console.log("Performing a move UP");
    break;
    case 'down':
    console.log("Performing a move DOWN");
    break;
    case 'left':
    console.log("Performing a move LEFT");
    break;
    case 'right':
    console.log("Performing a move RIGHT");
    break;
    default:
    console.log("Message not recognized");
    toPlotter(`IN;SC0,0,100,0,100;SP1;PA60,60;PU`)
    break;

  }

});