The device he holds in his hand is an Arduino connected to the OUTSIDE ... Apparently the DC barrel jack on the outside of the lock serves as a one-wire protocol interface. Once communications ...

Comparing the Arduino Uno and the Nano, you'll notice that the former includes an onboard DC barrel jack where you can conveniently connect your supply. Because of the Nano's small form factor ...

Musicians, makers and Arduino enthusiasts may be interested in a new project created by Max Danilin, showing a DIY automatic barrel piano, powered by an Arduino micro-controller and capable of ...

The Arduino Uno Rev3 is the third revision of ... Behind the R4 WiFi's barrel jack is a set of three headers labeled OFF, GND, and VRTC. The OFF pin is designed to turn off the board when it's ...