Add a Switch To add a switch you use a standart pull-up or pull-down schematic. I used the arduino pin next to the pin i want as the switch input to get the pull-up Voltage by setting the pin to HIGH ...

-3D printed parts - Top plate - Bottom plate - Walls Four DPDT switches Four screwable LED things 1x"Arduino Pro Micro", which is probably an Arduino Micro Clone. Important is that it has the ...

The security flaws on this common hotel keycard lock are nothing short of face-palmingly stupid. Look closely at the picture above. This is a hotel room door swinging open. The device he holds in h… ...