Optoelectronics – Free preview!

Questions

  • 1

    Ras Bongo Natty Tafari

    Are the other modules coming out?

    • Ian Juby

      All total I will have five modules, producing them over the next year or so. I’m already working on the second module (digital electronics) but it takes time. I just came back from vacation and got called back right to work as well, so time is an issue there.

  • 1

    Jacob

    Hi Mr. Ian .
    So could an infrared LED be used to project a shape in the sky and keep its shape. https://www.youtube.com/watch?v=_CRWE-L45k . I don’t know if I am getting a little to far ahead of my self.
    Jacob 🙂

    • Ian Juby

      Hmm… the youtube link didn’t copy over right, but I probably have an idea of what you’re getting at: Sort of the “Batman signal light”? 🙂 You can use LED’s for that, but you’d have to focus it through a lens because LED light diffuses so fast. Also, infrared is not visible to the human eye, so you’d need infrared night vision to see it. But yes – it could be done. 🙂

  • 0

  • 1

    Jacob

    OK try this link https://www.youtube.com/watch?v=0Ztp4ej5Q_4
    Jacob

    • Ian Juby

      Oohh – you mean the purple circle thingie? Hmmm… Ya, it could be done – but it would be tricky. They do similar things by spinning LED’s in a circle and timing when to turn the LED’s on and off, like this:

      But you can do similar pattern formations with lasers and moving mirrors – usually they just have two mirrors that you can rotate at different speeds, and the mirrors are on subtle angles so they “wobble”. You bounce the laser off of one mirror on to the other, and then on to the wall. Even a cheap laser pointer does pretty good. Then you get different patterns by simply varying the rotation speed of the mirrors, like this:


      That’s cool you’re thinking of stuff to build because that’s what’ll challenge you to learn things. 🙂

  • 1

    Jacob

    Thanks Ian I will try that.
    Also my friend has a BIG bass from an old stereo system and put a mirror on it.

    good job with the course.
    Jacob

    • Ian Juby

      Ah yes – I was going to mention that, but obviously youse guys thought of it already: A lot of speakers have mirrored domes or cones and you can reflect lasers off of them. 🙂