Advantages:
1. Effective control of home appliances.
2. Home automation using mobile phone.
3. Increases power efficiency.
4. Increases appliances lifetime.
5. Power wastage is reduced.
basic operation of mobile controlled lies with the functioning of DTMF and L293D driver ic. one mobile phone is used to send DTMF tones to Rx mobile phone and DTMF decoder ic is used to decode the dtmf tones and it sends information to to micro controller which produces response according to program and gives control to l293d driver ic.
DTMF board is used to enable or disable options on a repeater or a radio system. They are also used for phone patch (telephonic relay) if the repeater has an interconnect capability. DTMF also serves as an Automatic Number Identification system, or ANI. In handheld and vehicle mounted units the DTMF board can transmit the unit's identifier before or after the unit transmits, or both. This can come in handy for identifying who is talking in larger county 911 systems, or for any system with a large number of units, but can be used regardless of the size of a given system.
yes,any mobile 2day operates on dtmf tech. and sometimes call it as touchtone tech.,.
DTMF means Dual Tone Multi Frequency this is every key on your phone key pad, each key generates two tones over top of each other hence the Dual Tone of DTMF. This also applied to touch tone telephones that are hardwired in homes and businesses, they also use DTMF keying.
not possible !
AT89S52 is a microcontroller based on the Intel 8051 architecture and features. Concerning your question, AT89S52 is the heart of most project involving Dual Tone Multi Frequency (DTMF), that is to say it is the controller IC used in such project.
mujhe nhi pta
it does not have any feed back system
I assumed thats what its designed to be. See the datasheet on usage.
Dual-tone multifrequency A method used by the telephone system to recognise the keys pressed when dialling. Pressing a key on the phone's keypad generates two simultaneous tones, which are decoded by the exchange to determine which key was pressed. Dual-tone multifrequency A method used by the telephone system to recognise the keys pressed when dialling. Pressing a key on the phone's keypad generates two simultaneous tones, which are decoded by the exchange to determine which key was pressed.
DTMF - DUAL TONE MULTI FREQUENCY signalling
mutifrequence signal r given to input it select 2 i.e two frequence signal