Here is the circuit of an Arduino-based Panic Alarm ... and the Push-ON (push ‘n’ hold) switch (S1) to activate the alarm function. An additional Electro-Magnetic Relay (EMR) is also attached to the ...

[Ed] was tasked with adding push-button degaussing ... to use an SSR to switch the coil, and after making lots of transistor-based designs on paper, grabbed a nearby Arduino.

Thereafter, you should push the reset switch once to make the system fully functional ... That’s all! /* * SIM800L SMS RELAY v1.0 * Arduino Hardware (Author): Nano V3 (ATmega328) * Arduino IDE (Author ...

The alarm only stops when you press the push button connected to the Arduino. For this setup ... the hardware for this setup is pretty minimal: a relay for the bulb, a resistor for the LDR ...

you can replace them with bigger LEDs or even a light bulb (paired with a relay for the Arduino Uno). Try a toggle switch instead, so you won't have to keep your hands on the push button.

An Arduino Nano controls two relays which in turn can turn the car on, start it, and turn it off. Instead of adding a button for “push to start” he opted for a 13.56MHz RFID module.