MEMS BASED HOME APPLIANCE CONTROL

ABSTRACT:

Microelectromechanical systems (MEMS) (also written as micro-electro-mechanical, MicroElectroMechanical or microelectronic and microelectromechanical systems) is the technology of very small mechanical devices driven by electricity and it merges at the nano scale into nano electromechanical systems (NEMS) and nanotechnology.

            MEMS are separate and distinct from the hypothetical vision of molecular nanotechnology or molecular electronics. MEMS are made up of components between 1 to 100 micrometers in size (i.e. 0.001 to 0.1 mm) and MEMS devices generally range in size from 20 micrometers (20 millionths of a meter) to a millimeter. They usually consist of a central unit that processes data, the microprocessor and several components that interact with the outside such as micro sensors.

            This project consists microcontroller, MEMS sensor and RF communication. MEMS give different coordinates according to its moments. It gives X, Y, Z coordinate values when it was moving in 3 Dimensional areas. This MEMS works on i2c protocol and having SDA, SCL pins. Here microcontroller acts as master and MEMS acts as a slave.  

The main aim of this project is to control the home appliances using MEMS with RF wireless technology. The MEMS will be interfaced to microcontroller with RF transmitter which acts as transmitter section. On the other we will have receiver section which is interfaced by RF receiver connected with relays. Whenever the MEMS in hand moves in any direction, the mechanical movement of the hand will be recognized by MEMS. MEMS convert this mechanical hand movement into equivalent electrical signals and send it to the microcontroller. The microcontroller receives these signals and sends them to the PC. Here PC will be interfaced to the controller through serial communication. As per the gesture according to the hand movements, the MEMS sends coordinate values to microcontroller and the controller sends data through RF transmitter which is interfaced with HT12E.

On the receiver section, the data received by the RF receiver interfaced through HT12D will activate/enable the relays as per the gesture values transmitted by the RF transmitter. The Relays are connected with AC loads. This project uses regulated 5V, 500mA power supply. Unregulated 12V DC is used for relay. 7805 three terminal voltage regulator is used for voltage regulation. Full wave bridge rectifier is used to rectify the ac output of secondary of 230/12V step down transformer.

TECHNICAL SPECIFICATIONS:

HARDWARE:

Micro controller         :           AT89x series                          

Crystal                        :           11.0592 MHz                            

RF transmitter                                                                        

RF receiver                                                                            

HT12E

HT12D

MEMS                         :           I2C MEMS                          

Power supply

Transformer: 12V step down 

Filter: 1000uf/25V

Voltage Regulator: 7805, 7812

SOFTWARE:

Keil IDE

VB dotnet frontend

UC flash

Proteus

APPLICATIONS

  • Industrial applications
  • Automatic control systems
  • Wheel chair for PHC
Categories: MEMS