plan to spend about $1,300 for DIY alarm systems. That’s still about half of what a professional alarm company would charge. Monitoring service, which notifies the police or fire department ...

There’s a huge market for 433 MHz alarm system hardware out there ... From there, the code on the ESP can fire off using whatever API works for your purposes. In this case [Aaron] is using ...

A manual fire alarm system consists of notification appliances throughout, activated by manual pull stations at every exit ...