I recently received my first (Chinese) Arduino card. My first circuit is really simple, read a switch state :) However, it's not as obvious as it seems (for me :D). I learned the goal

I received some NPN transistors (2N2222). I hope to use them to power on / off some sensors, requiring too much energy to be supplied by the Arduino card (next step!). But before doing

Now that I have my breadboard, I'm ready to make the easiest circuit of the world : power on a LED :D I choose a blue LED, which allow an input voltage of 2.

Few days ago, I received my first breadboards ! It seems that breadboards are essentials to prototyping electronic circuits. It's important to understand how they work, and even better, how to work with :) After

As I said in my previous post, I don't have much knowledge in electronic. I know some basics as Ohm's law, Kirchhoff's circuit law, I've heard the terms "PNP" and "