This usually takes not less than 30 seconds. So a 30 seconds delay is intentionally included in the sketch. For other type of sensors this is not necessary, thence remember to delete the line delay(30 ...

There’s a huge market for 433 MHz alarm system hardware out there, from PIR motion detectors to door and window sensors. If you want to put them to work, all you need is a receiver, a network ...

Alarm systems are complicated affairs. ... Build a Simple, Photo Snapping Alarm System with an Arduino. Thorin Klosowski. December 8, 2015 Alarm systems are complicated affairs.