The PCB must be mounted floated, otherwise key presses don't work reliable. Connect pins 3 and 4 on connector P1 for 16-pin button mode. Smaller keypads with less pins may work, but are not tested.

The BNC Shield for Arduino is a very simple way to reliably connect an Arduino to one or more BNC cables. Especially in science, it is very common to use an Arduino to trigger a camera or behavioral ...

Abstract: This system presents the design and implementation of a password-based door lock system integrated with LED light control for enhanced security. The proposed system allows password entry ...