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/

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 …

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.

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 …

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 …

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 …

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 …

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 …