Here is the circuit of an Arduino-based Panic Alarm! The wiring is very simple so that even ... An additional Electro-Magnetic Relay (EMR) is also attached to the interface circuit. With the help of ...

This is a low-level 5VDC 2-channel relay module with a standard interface that can be controlled directly ... If so, remember to connect the VCC pin to 5V of the Arduino board to enable the control ...

[Andrew Sowa] wanted to use an off-the-shelf relay ... interface, which meant that [Andrew] would have to build one, and its input connectors are screw terminals, which meant a lot of wiring.