rwaldron/johnny-five

Me again. I'm facing a new problem with the Servo object. I have some code (see full example below), that sweeps the servo for a few seconds and then sends it randomly to 0°, 90° or 180°. The code works perfectly fine... until I add a second parameter to the to() method. With this 2nd parameter present, once in a while, it will go to the wrong destination.

Here's the code, it's a bit long but it's a fully working example. You jsut have to hook up a servo on pin #10 (I have an SG-90 servo).

const five = require("johnny-five");
const SerialPort = require("serialport");

let servo;

getPort().then(init).then(start);

function getPort() {

  return SerialPort.list().then(ports => {
    const device = ports.find(port => {
      return port.manufacturer && port.manufacturer.startsWith("Arduino")
    });
    return device.path;
  });

}

function init(port) {
  return new Promise((resolve, reject) => {
    const board = new five.Board(port);
    board.on("ready", resolve);
    board.on("fail", reject);
  });
}

function start() {

  servo = new five.Servo({
    pin: 10,
    center: true
  });

  setInterval(go, 6000);

}

function go() {

  servo.sweep();

  setTimeout(() => {
    servo.stop();
    const target = Math.floor(Math.random() * 3) * 90;
    console.log(target);
    servo.to(target, 1000); // If I remove 2nd param, it works every time!
  }, 4000);

}

Ideas?