Oscar Liang
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Latest Posts

  • Robot

    Build your own IR detector

    by Oscar 15th December 2011
    15th December 2011

    Let’s have a look at the result! Check our my last tutorial to see how it works (theory and example). https://oscarliang.com/infra-red-detection-and-photo-transistor-testing/

  • Robot

    Infra Red detection and Photo Transistor Testing

    by Oscar 14th December 2011
    14th December 2011

    IR is invisible to human eyes.  There are two main frequency IR emitters are used: 850nm and 950nm. however for detector, the detectable range covers both frequencies. As we can’t see IR, one way to …

  • Robot

    Build a Servo Head

    by Oscar 9th December 2011
    9th December 2011

    This one hasn’t got too much technical stuff involved, all the operations are from previous tutorials. The main things would be the turning head that I made purely from cardboard, and a couple of screws.

  • Robot

    Build your own motor driver!

    by Oscar 7th December 2011
    7th December 2011

    What is L293D?  So what’s L293D, and what does motor driver do? The L293D is a H bridge 16-pin chip that takes an external power supply and drive up to two 5V DC motors (suitable for …

  • Robot

    How to control a Servo

    by Oscar 28th November 2011
    28th November 2011

    In this one, servo is programmed to be controlled by two buttons, one turns servo to the left and the other one turns it to the right. When the servo is turning, corresponding LED will …

  • Robot

    IR obstacle detection Robot

    by Oscar 28th November 2011
    28th November 2011

    Today, I happened to come across this website, describing how to build a very simple robot without any electronics knowledge. It’s very interesting and easy. But it suggests a budget of over $110 which is very …

  • Robot

    Learn how to use 4-digit-7-segment LED Display

    by Oscar 23rd November 2011
    23rd November 2011

    In our last project, I shown you how to use one digit 7 segment LED display. In this one, I will show you how to use all 4 digits. I will be using the class …

  • Robot

    Learn how to use 7-Segment LED Display

    by Oscar 21st November 2011
    21st November 2011

    7-Segment LED Display is a very useful component, but also a very confusing and difficult piece to use for beginners. It won’t be difficult once you get it working for the first time. This is what …

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Oscar Liang
  • Shopping List
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