Here is an ultra simple Arduino Night Alarm project wired around a handful of inexpensive and easily available components. One advantage of using Arduino as a security system is the flexibility!

Fig. 1: Author’s prototype Fig. 2: Block diagram of motion sensor alarm Circuit and working. The circuit diagram of the motion sensor alarm is shown in Fig. 3. It consists of a PIR motion sensor (MS1) ...

Fig. 1: Circuit diagram of the Arduino based GSM home automation system. Brain of the circuit is Arduino Uno MCU board (Board 1). PIR sensors (connected across CON4 through CON8) detect motion, and ...

In this Arduino Fingerprint Sensor Project, we have used Fingerprint Sensor Module to take finger or thumb impression as input in the system. Here we are using 4 push buttons to Enroll/back, Delete/OK ...

The system here uses a cheap Arduino board, a few sensors, and a magnetic contact switch. It’s then hooked into the Adafruit IO and connected to IFTTT, so you can set up alerts in any way you like.