30-08-2014, 03:19 PM
In this project, data is sent from keyboard and transmitted & received through RF and the controlling device is ATmega8A. Arduino platform is given to ATmega8A.The 212 encoders are a series of CMOS LSIs for remote control system applications. They are capable of encoding information which consists of N address bits and 12_N data bits. Each address/data input can be set to one of the two logic states. The programmed addresses/ data are transmitted together with the header bits via an RF or an infrared transmission medium upon receipt of a trigger signal. The capability to select a TE trigger on the HT12E or a DATA trigger on the HT12A further enhances the application flexibility of the 212 series of encoders. The HT12A additionally provides a 38kHz carrier for infrared systems .
The 212 encoders are a series of CMOS LSIs for remote control system applications. They are capable of encoding information which consists of N address bits and 12_N data bits. Each address/data input can be set to one of the two logic states. The programmed addresses/ data are transmitted together with the header bits via an RF or an infrared transmission medium upon receipt of a trigger signal. The capability to select a TE trigger on the HT12E or a DATA trigger on the HT12A further enhances the application flexibility of the 212 series of encoders. The HT12A additionally provides a 38kHz carrier for infrared systems .
Arduino is a open source electronics prototyping platform based on flexible, easy-to-use hardware and software. It’s an open-source physical computing platform based on a microcontroller board, and a development environment for writing software for the board.In simple words,Arduino is a small microcontroller board with a USB plug to connect to your computer and a number of connection sockets that can be wired up to external electronics,such as motors,relays,light sensors,laser diodes,loudspeakers,microphones, etc. They can either be powered through the USB connection from the computer or from a 9V battery.They can be controlled from the computer or programmed by the computer and then disconnected and allowed to work independently.The name “Arduino” is reserved by the originalmakers. However, clone Arduino designs oftenhave the letters “duino” on the end of their name,for example, Freeduino or DFRduino.The software for programming your Arduino iseasy to use and also freely available for Windows,Mac, and LINUX computers at no cost.Microcontroller can be described as a computer embedded on a rather small circuit board.To describe the function of a microcontroller more precisely,it is a single chip that can perform various calculations and tasks,and send/receive signals from other devices via the available pins.Precisely what tasks andcommunication with the world it does, is what is governed by what instructions we give tothe Microcontroller. It is this job of telling the chip what to do, is what we refer to as programming on it.However, the uC by itself, cannot accomplish much; it needs several externalinputs: power, for one; a steady clock signal, for another. Also, the job of programming ithas to be accomplished by an external circuit. So typically, auC is used along with a circuitwhich provides these things to it; this combination is called a microcontroller board.The Arduino Uno that you have recieved, is one such microcontroller board. The actual microcontroller at its heart is the chip called Atmega328. The advantages that Arduino offers over other microcontroller boards are largely in terms of reliability of the circuit hardware as well asthe ease of programming and using it.
Features are Operating voltage, 2.4V~5V for the HT12A, 2.4V~12V for the HT12E, Low power and high noise immunity CMOS technology, Low standby current: 0.1A (typ.) at VDD=5V, HT12A with a 38kHz carrier for infrared transmission medium, Minimum transmission word, Four words for the HT12E, One word for the HT12A, etc. Applications areBurglar alarm system, Smoke and fire alarm system, Garage door controller, Car door controllers, etc.