i wanted to try something more practical so today in this blog, we will learn how to make motion activated security system for your home or garage. we will wire this system, build our android / ios app which will receive notification and see this system in action. we basically need a system that can be activated on motion, later on we will generate a very high pitch irritating sound as alarm and finally we will add ability to switch the alarm onn / off and get notified on app whenever alarm is triggered. for buzzer or alarm system, i used this industrial alarm which is generally used in atm’s and other industrial applications. it works on 230v ac and has knob to adjust the pitch, which we will set to maximum irritation level for maximum efficiency. “the doppler effect (or the doppler shift) is the change in frequency of a wave in relation to an observer who is moving relative to the wave source.
this module basically sends an em wave and whenever there is motion, due to doppler effect the em waves either get compressed or decompressed which is observed by shift in frequency. in either case the mixer will sense difference and indicate an output for 2 seconds. we will also add software button to basically switch the system on or off while not in use. once the rcwl output and out app switch is active, we will strobe patterns of sound alerts and also send email and app notifications along with a wonderful tweet. by this time our circuit and project is almost done, but like always i don’t like to see my circuit as a mess so i will enclose it inside an electrical box of dimension 102 x 102 x 48 mm ( 4″ x 4″ x 2″ ). i hope you guys learnt something from this blog and hopefully enjoyed learning, if so hit the like button and share this post with your friends, also consider subscribing to our social handles, it’s free.
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