Project halim Assignment Example | Topics and Well Written Essays - 1750 words

Project halim - Assignment ExampleThe main berth of the encoders and decipherers is to convert parallel selective information to series data. Design of the control rophy The function of the control circuit will be to give an alarm to indicate the departure of the child. The communication process that will be employed is the RF communication because it is the most accepted and affordable cost solution. In the RF module, both(prenominal) transmitter and receiving system pairs are essential because the communication uses the principle of sequential communication. The module of operation demands a component that converts the n-bit data to serial data. The RF module can, therefore, employ Serial encoders or decoders (HT12D and HT12E) to convert the data or task. RF communication block diagram The block diagram of the RF communication illustrated preceding(prenominal) employs the encoders/decoders that are TTL compatible. Therefore, the input levels are depicted in a TTL Logic level. To solve the problem, the TTL input essential be changed into serial data input. To have a serial data input, an encoder must be use because it can be read directly by the RF transmitter performing the amplitude observe shifting (ASK) modulation, and further transmitting the data via antenna. At the receiving end, modulated signal by the antenna is authorized the RF recipient carries out the filtering, demodulation and processing of the transmitted data. The data obtained at the end is a serial data that is converted to a TLL level logic data. The RF Module The module comprises of an RF receiver and transmitter. The two operate at a frequency of 434MHz. The transmitter obtains serial data from the encoder and transmits it using a wireless platform provided by the antenna attached to the pin 4 (data). The transmittance speeds are amid 1Kbps and 10Kbps. The RF receiver operated at the same frequency as the transmitter to obtain the data transmitted. In most cases, the RF module is used beside coupled with a pair of encoder HT12E and Decoder HT12D. The encoder is useful in encoding parallel data for transmission while the receiver send the required signal to the decoder for decoding. Features Range frequency of the TX 433MHz Supply voltage of the TX 3V 6V Coverage in open space (standard Conditions) 100 Meters Receiver Frequency (RX) 433 MHz Operating voltage of RX 5V Supply current of the RX 3.5 mA RX IF Frequency 1MHz Low proponent consumption Easy Application HT12E and HT12D The decoder (HT12D) is ICs comprising a series of CMOS for remote control applications. The IC is mated with an encoder HT12E with the HT12D main role is the conversion of the serial input to parallel output. The HT12D decodes the serial comprehendes and data that are certain by the RF receiver, which in turn sends the parallel data to the output pins after processing. For successful operation, the opposite decoder and encoder must have the same number of address and data forma t selected. The serial data and address from matching encoder, received by the decoder, is transmitted by a carrier employing the RF transmission medium providing output to the output pins. Consequently, the HT12E encoder IC is also a series of CMOS specifically for Remote run into applications. The purpose of its use is interfacing the RF. The suitability of the encoder is restricted to 12 bit information consisting of N data bits and address bits. The encoder converts the parallel input from the