As we work on projects we’re frequently upgrading our tools. That basic soldering iron gives way to one with temperature control. The introductory 3D printer yields to one faster and more cap… ...

I just received my RC522 RFID reader and made this simple Arduino access control system that uses the reader, a buzzer for the alarm and a relay shield for the security system. The relay can be used ...

He managed to build his own monitor using an Arduino. The trick of this build has to do with how the system works. The panel includes an LED light that blinks 1000 times for each kWh of electricity.

The next stage was to create the Arduino code which I created by modifying code already available from the website to record mph rather than m/s and added extra code to support the 16×2 LCD display.

You can adjust the spinning speed with a potentiometer and you can also set a minimum and maximum speed in the code. You will need an Arduino board, a potentiometer (I have used a 50K one), ... (#21).