Communicating between NodeJS and Arduino through SerialPort

Question

I'm trying to get a message from my Arduino to NodeJS using SerialPort. Here is my NodeJS code:

var SerialPort = require('serialport');
var port = new SerialPort('/dev/tty.usbmodem1421',{
  baudRate: 9600
});

port.on('data',(data) => {
  console.log(data);
});

And here is my Arduino code:

void setup() {
    Serial.begin(9600);
}

void loop() {
    Serial.println("Message");
    delay( 1000 );
}

It's working. However, the message I am receiving looks like this:

<Buffer 4d 65 73>
<Buffer 73 61 67 65>
<Buffer 0d 0a>

I've tried a lot of different things to try and read the message properly. If it makes a difference I would eventually like my message to be JSON. Here are a few things I have tried:

I've added this:

parser: SerialPort.parsers.readline('\r\n')

I think that might be out dated, as I get readline is not a function errors messages.

I have tried using a Readline object:

var parser = new Readline();
parser.on('data', function(data){console.log( data );});

Any help would be very much appreciated!

HumberSean · Accepted Answer · 2024-09-24 20:21:51Z

2

For version 12, the new docs say:

const { SerialPort } = require('serialport')
const { ReadlineParser } = require('@serialport/parser-readline')
const port = new SerialPort({ path: '/dev/ROBOT', baudRate: 14400 })

const parser = port.pipe(new ReadlineParser({ delimiter: '\r\n' }))
parser.on('data', console.log)

https://serialport.io/docs/api-parser-readline

answered Sep 24, 2024 at 20:21

HumberSean

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Adam · Accepted Answer · 2018-02-16 11:33:46Z

1

Ends up I was looking at the wrong documentation. The version of SerialPort I was using is 6.x, most of the help out there is for a much older version. The solution was in the GitHub most recent examples:

const SerialPort = require('serialport');
const parsers = SerialPort.parsers;

const parser = new parsers.Readline({
  delimiter: '\r\n'
});

const port = new SerialPort('/dev/tty-usbserial1', {
  baudRate: 9600
});

port.pipe(parser);

parser.on('data', console.log);

The process of parsing has changed dramatically.

https://github.com/node-serialport/node-serialport/blob/master/examples/readline.js

answered Feb 16, 2018 at 11:33

Adam

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