He thus set about working on a burglar alarm that would fit his unique requirements. An ESP32 is the heart of the operation, paired with a long-range LoRa radio module running at 868 MHz.

In 1877, Holmes established the first network of alarms monitored by a central station. The Holmes Burglar business was bought by the American Telephone and Telegraph Company (AT&T) in 1905, which ...

[Jeff Sandberg] demonstrates that ably with his project to use ancient 1990s burglar alarm sensors in his modern smarthome setup. The sensors in question are from an old GM Interlogix security system.

Combination supervised alarm/relay module that offers surface mount technology and flash memory. The AIO-168 alarm and relay processor module provides 16 zones which meet UL Grade A analogue line ...