Elements of a Security System – Part 3, by J.M.
(Continued from Part 2.) There’s another potential option for alerting that could be categorized as ‘mobile centralized’ – it’s possible to set up a radio transmitter connected to a centralized console that would transmit a pre-recorded voice alert (e.g. ‘Alert in zone 3 North’) to a radio that you carry around with you. Some of the sensors I’ll be discussing later have this capability built-in, but you could implement a similar function using a Raspberry PI computer to monitor the sensors, connected to a RTL-SDR software-defined radio to transmit pre-recorded audio alerts. Implementing this would be moderately complicated and is …