CODEWITHSUNDEEP
javascriptnode.jsreal-time
ahmedkhabkhab
ahmedkhabkhab

Reputation: 43

Real-time data acquisition from serial port with node.js

I am working on a project that requires real-time data acquisition from the serial port. Data flow is really fast and it's basically a list of points measured in real time. I am working with serialport in order to handle the communication part, socket.io to communicate with the client (A web page that contains a chart where points should be plotted). When I send 1 point per second, it works fine but when the data flow is fast (like 1 point/10ms) node.js shows this error:

MaxListenersExceededWarning: Possible EventEmitter memory leak detected. 11 data listeners added. Use emitter.setMaxListeners() to increase limit

My question is:Is there a solution to handle such a fast flow in real-time? My first thoughts where about using a producer consumer algorithm and a queue to collect data from serial port. What I would like to know if there is more optimized solutions.

The scenario is like this:

Node:js: GET_VALUE
Microcontroller: 1234
Node:js: GET_VALUE
Microcontroller: 5678

My code:

function readFromUART() {
        chosenPort.write(cmdGetValue, function(err) {
        if (err) {
            return console.log('Error on write: ', err.message);
        }
        });
            console.log('NODE: GATHER DATA');
        parser.on('data', function(data){
            console.log(data);

This function is called every X ms

setInterval(readFromUART, 1000);

Upvotes: 1

Views: 1125

Answers (1)

ahmedkhabkhab
ahmedkhabkhab

Reputation: 43

I found a solution. It's better to use eventemitter3 rather than eventemmiter. It has high performance in real-time applications.

var EventEmitter = require('eventemitter3');

var eventEmitter = new EventEmitter();

Upvotes: 0

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