Design and construction of cellular phone calling detector
Department of Physics, Faculty of Physical Sciences, University of Calabar, Cross River State.
Research Article
World Journal of Advanced Engineering Technology and Sciences, 2021, 03(01), 034–040.
Article DOI: 10.30574/wjaets.2021.3.1.0047
Publication history:
Received on 09 June 2021; revised on 12 August 2021; accepted on 14 August 2021
Abstract:
Cellular phone detector is an electronic device that when placed some few centimeters away from a mobile phone pulse-blink by a way of lighting a light emitting diode (LED) whenever a call is made to the phone. The ability of the detector to successfully indicate a light on the LED is highly dependent on the distance between the phone and the detector. Accordingly, there is need to improve the distance of separation. The aim of this research project is to design and construct a device that when placed a few centimeters away from a phone lights up a light emitting diode (LED). The signal detected is enabled by a coil used as an antenna which receives signal and then amplified by a transistor which drives the monostable input pin of the IC 555 timer. Thus, a light emitting diode lights up indicating a call made to a phone. This research discovers that as the number of turns of the coil increases and the calling detector is placed far from the phone, the weaker the signal becomes. Future studies will focus on increasing the distance of the separation to any length that is convenient for use.
Keywords:
IC 555 timer; Antenna; Light emitting diode; Pulse-blink; Detector; Coil
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Copyright © 2021 Author(s) retain the copyright of this article. This article is published under the terms of the Creative Commons Attribution Liscense 4.0