Switch devices on and off remotely by call or text without the need for expensive GSM remote control systems. The Velleman MK160 features a brightness sensor which detects the blacklight and switches a NO/NC relay when a sudden increase in brightness occurs. Placing the brightness sensor on the screen of a mobile phone means that when the phone is called or texted and the screen lights up, the relay will be switched. As the phone does not need to be answered by the module, this method of switching is entirely free.
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