joppiesaus

Most recent activity

• Espruino Pico: Can I power it via battery instead of USB?

  in General • 9 years, 7 months

  

  Yes
  You don't even need to power it via the USB, you could also power it by connecting it to BAT_IN and the GND pin(the two front pins), as long as the input voltage is ≥ 3.5 & ≤ 16v!

  On-board 3.3v 250mA voltage regulator, accepts voltages from 3.5v to 16v

• Simple (but good) Message Encryption?

  in General • 9 years, 7 months

  

  You are right. But this is actually not a problem if the data is 100% random, because the chance that the message is "Attack from the north" is the same as "Attack from the south", or "I like cats so much!!"
  But your key can be very large! You could pick different or random indexes from the key. Maybe that's a solution.
  Or come up with something else.

• Simple (but good) Message Encryption?

  in General • 9 years, 7 months

  

  Is XOR Encryption with the One-Time pad an option for you?
  If the key you use is random, this encryption will be uncrack-able.
  And the encrypted message isn't longer then the not-encrypted message.

  Here's some pseudo-code:

  var key = <random data>
  var message;
  function encryptMessage()
  {
    message ^= key;
  }
  
  function decryptMessage()
  {
     message ^= key;
  }
  

• Random Number Generator

  in JavaScript • 9 years, 7 months

  

  I'm having the same problem here: The current random generator is based on the state of the machine and time. If you disconnect the power and reconnect it again, the number sequence will be the same, which is for some usages not suitable.
  I've thought about fixes for it: Adding a number of how many times it has booted or analog reading something unused(getting random noise).
  I'm not a RNG expert thought, but randomness should always be unpredictable.

• Multiple timeouts not working?

  @joppiesaus started

  • 7 comments
  • 2,810 views

  @allObjects replied
• Multiple timeouts not working?

  in JavaScript • 9 years, 7 months

  

  Thanks a lot! I often forget those kinds of things. Now it works!

• Multiple timeouts not working?

  in JavaScript • 9 years, 7 months

  

  So I'm still enjoying to work on my fruitmachine, but the way I implement multiple timeouts don't seem to work correctly.
  Basically, I've 3 LED's, or fruits - or wheels, and I stop them one by one in order of time. When I spin the wheel, I tell it when to stop spinning. It works by just setting the velocity of the wheel to 0.

  Wheel.prototype.spin = function(stopt) // stopt = stoptime
  {
    this.vel = (2 + Math.random() * 5) / 40; // give the wheel a velocity
    setTimeout(this.stop, stopt); // tell it when to stop
  };
  

  Then you have the stop function

  Wheel.prototype.stop = function()
  {
    this.vel = 0.0;
  };
  

  The spinning happens when the user clicks the button. At that time, spin is called(not Wheel.spin)

  function spin()
  {
    for (var i = 0; i < N_LEDS;) // loop trough all wheels, spin them
    {
      wheels[i].spin((++i * 500));
    }
    
    setTimeout(function(){
       //... other code. It checks some win conditions and lights and stuff after every wheel stopped.
    }, (N_LEDS + 2.5) * 500);
  

  But, only the last setTimeout seems to be called.
  What am I doing wrong?

  Here's the full code.

• Odd timing behavior

  @joppiesaus started

  • 6 comments
  • 3,060 views

  @allObjects replied
• Odd timing behavior

  in General • 9 years, 7 months

  

  It works! It really works! Too bad I accidentally override reset(). Thanks!
  EDIT: Maybe a warning in the Web IDE when you override reset() or any of the core functions?

• Odd timing behavior

  in General • 9 years, 7 months

  

  Interesting, but I don't think that's the issue. I changed onInit() to init(), but that didn't help.