The system operates off mains power but swaps to a 1000mAH 9V backup battery during a power outage, logging the time and sending out the SMS alerts. A second message informs the contacts when ...

In case of an intrusion attempt, a warning message is being transmitted by the system (as an sms ... call” alert, incase of an intrusion attempt. The circuit is highly-flexible so that you can use any ...

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.