 | | | 55 pages | | | 29-04-2010 | | |  |
| | Not evaluated | | |
|
Outline of the aims of this design project:
1. Design a Cell Phone Operated Devices System that can be operated using DTMF technology to overcome the limited working range of remote control and to provide larger coverage area.
2. We designed a cell phone operated devices system which can be operated where the area is available and we can use this circuit in most of the places.
3. You can control the number of devices. It may be any electric or electronic appliance or device ranging from simple to heavy appliances. Each device is given a unique code.
4. It makes accurate switching, any false switching of device are not done.
5. There is no risk of false switching.
6. To perform any operations through a remote phone line, the user needs to dial the mobile phone (to which the interfacing circuit is connected) then the respective code of the device is dialled.
7. This circuit does not require any complex IC, so anyone with little knowledge of electronics can construct this circuit, because it does not need any programmable IC's or programming.
1.2) WHAT THE SYSTEM DOES
Controlling devices using switches are common. From a few decades controlling devices using remote control switches like infra-red remote control switch, wireless remote control switches, light activated switches are becoming popular. But these technologies have their own limitations. Laser beams are harmful to mankind.
Some technologies like IR remote control are used for short distance applications. In such case if we have system which does not require any radiations or which is not harmful, long remote control switch!! Yes here is the solution. Here I am introducing such a system which does not require any radiations, any laser beam which has no limitation of range, I mean it can be used from any distance from meters to thousand kilometers using a simple telephone line or mobile phone.
Here I am using a mobile phone as a media, which serves main part of this system, by using mobile phone as a local phone and remote phone as well.
Mobile phones today became an essential entity for one and all and so, for any mobile based application there is great reception. In this scenario making a mobile phone operated devices system is good idea.
Conventionally, Wireless controlled devices use RF circuits, which have the drawbacks of limited working range, limited frequency range and limited control. Use of a Mobile Phone for Device control can overcome these limitations.
It provides the advantage of robust control, working range as large as the coverage area of the service provider, no interference with other controllers and up to twelve controls.
The control of circuit involves three distinct phases: PERCEPTION, PROCESSING and ACTION.
1. PERCEPTION: - Perception is decoder mounted on the circuit.
2. PROCESSING: - Processing is done by the on-board microcontroller.
3. ACTION: - Action (task) is performed using relays or with other actuators[...]
1. Introduction
1.1 Aims
1.2 What the system does
1.3 System block diagram
1.4 Tables
1.4.1 Table 1: Tones and Assignments in a DTMF system
1.4.2 Table 2: DTMF data output
1.4.3 Table 3: Actions performed corresponding to the keys pressed
2. Methodology
2.1 Design & Implementation
2.2 Concept and Implementation
2.2.1 PCB designing
2.2.2 Layout design
2.2.3 Etching process
2.2.4 Component assembly
2.2.5 Soldering
2.2.6 Circuit diagram
2.2.7 PCB layout
2.2.8 Flow chart
2.2.9 Literature survey
3. Component details
3.1 Power supply
3.2 DTMF decoder (mt8870)
3.4 Pin configurations of mt8870
3.5 Micro-controller (at89s52)
3.6 pin configuration of at89s52
3.7 Liquid crystal display
3.8 Pin description
3.9 Pin diagram of 2x16 line LCD
3.9.1 Table : pin description of the LCD
3.10 Relays
3.11 List of components
4. Future works
5. Applications
6. Advantages & Limitations
Conclusion
Bibliography
Appendix (Data Sheets)
|
Design Project: Cell Phone Operated Device using DTMF Technology | 55 pages | | | €9.00 |
|| | Add to cart |
