Generally, several home equipment can be controlled by switches. But these days we can observe the home automation to control the appliances using various technologies. This article presents the DTMF based load control system. The term DTMF stands for Dual Tone Multi Frequency is a signalling system for recognizing the DTMF keys on a keypad. The applications of DTMF include telecommunication signalling over analogue telephone lines in the voice frequency band among telephone handsets and communication devices. So, when you make a call for customer care they will request you to push any number. When you push any number on your mobile keypad, one specific action will occur because of DTMF. When a keypad button is pressed in a mobile keypad, instantly it will produce a tone of two frequencies called column and row frequencies. Here, the column frequencies are high frequencies and row frequencies are low frequencies.
At the present time, generally, attendance system in schools, colleges, etc is based on paper. So sometimes this procedure causes mistakes and also time taking process. So the proposed system uses RFID technologies to make a reminder of each student … [Continue reading]
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While driving on highway, traveler should not exceed maximum speed limit allowed for their vehicle. However accidents keep happening due to speed violation since the drivers tends to ignore their speedometers. The speed checker will come for the … [Continue reading]
Nowadays, the rapid development of cell-phones has raised a lot of problems. In addition, public response was rising against the difficulty of cell phones introduced in daily life. Here is a simple project that is “hidden active cell phone detector”. … [Continue reading]