You can also go the 9v battery route plugged into the on-board regulator of the Arduino but the low mAh rating of a 9v won’t allow your project to stay running for very long. [AI] needed a quick ...

This powerful audio-visual alert device is realized using the renowned Arduino platform. The 9V battery powered circuit produces a ... operated on the 12VDC input supply as shown in the basic ...

This is an easy tutorial showing how you can control the brightness of an LED or adjust the speed of a DC fan using Arduino Board, a small BC547 transistor and a potentiometer. In my example the whole ...

I stumbled on [Carlos]’ blog while I was hunting for Arduino ideas ... He stuffed his IR detector inside an old 9V battery case. The TSA probably won’t like it, but it’s a fantastic idea ...