Čidlo zvuku
Mohlo by tam být čidlo zvuku?? Např. http://m.ebay.com/itm/Sound-Detection-Detecting-Sensor-Module-PIC-MIC-Controller-Precise-3-3V-5V-/262363559950?hash=item3d1616380e%3Ag%3ACiUAAOSwNphWZ9ZV&_trkparms=pageci%253A80a4f121-a11f-11e6-a28a-74dbd1804696%257Cparentrq%253A2606e3c91580a356d43364c6fffa86bb%257Ciid%253A14 NEBO