Node.js analogWrite / PWM

machek · September 7, 2018, 1:49pm

Hi *,

I used the C API for controlling my GrovePi based RC-Tank, which worked flawlessly.
No I’m doing a complete rework in Node.js with the Express framework.

Unfortunately I was unable to find the Node equivalent for analogWrite() to send PWM signals.

Is this impossible for now, or am I missing something?

Many thanks in advance.
Bastian

RobertLucian · September 8, 2018, 6:18pm

Hi @machek,

That’s a good question. @marcello-barile, do we have such a method in NodeJS?

Thank you!

marcello-barile · September 10, 2018, 6:24am

hi @machek,
is this what you are looking for?

github.com

marcellobarile/GrovePi/blob/master/Software/NodeJS/libs/sensors/base/analogSensor.js

var util         = require('util')
var Sensor       = require('./sensor')
var commands     = require('../../commands')

function AnalogSensor(pin) {
  Sensor.apply(this, Array.prototype.slice.call(arguments))
  this.pin = pin
}
util.inherits(AnalogSensor, Sensor)
AnalogSensor.prototype = new AnalogSensor()

AnalogSensor.prototype.read = function(length) {
  if (typeof length == 'undefined')
    length = this.board.BYTESLEN

  var writeRet = this.board.writeBytes(commands.aRead.concat([this.pin, commands.unused, commands.unused]))
  if (writeRet) {
    this.board.readByte()
    var bytes = this.board.readBytes(length)
    if (bytes instanceof Buffer) {

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Best,