The objective of Kit Wireless Alarm Using RF Module is to design a security system which can be control wirelessly using RF module. It outputs the alarm as an indication. In this kit Wireless Alarm Using RF Module the first block is power supply in which the input is 230V AC which is step down using the transformer (12-0-12) .The 12V ac input is fed to the bridge diode to gives 12V pulsating DC. This DC voltage is filtered through the capacitor to remove the ripples. The filtered DC is fed to 7805 regulator to fetch +5v regulated output.
In the kit Wireless Alarm Using RF Module HT12E encoder IC takes 4-bit binary sequence from the DIP switch. Each binary sequence notifies the identity of the item. As we have used 4-bit channel so we can allocate 16 items (in our case it will be four). The encoder converts this four bit binary sequence into a serial data with address data latched with it. The signal generated from the encoder is not strong enough to be transmitted for a quiet fine ranges of distance so this need to be modulated and transmitted over a carrier. To serve this purpose we have used an RF transmitter working on 433 MHz, 4800bps baud-rate and uses ASK modulation technique. Thus, the data lines of the IC are used to differentiate between different ids and these are transmitted over RF channel. The next section is the RF receiver. There is an 8 terminal RF receiver which has same properties as configured for the RF transmitter. It receives the serial data wirelessly depending upon the RF communication protocol. The receiver sends the serial data to the HT12D IC which converts this serial data in parallel data of 4-bit which is same as enabled on the transmitter end. It indicates alarm as output.
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2. The objective of Kit Wireless Alarm Using RF
Module is to design a security system which
can be control wirelessly using RF module. It
outputs the alarm as an indication. In this kit
Wireless Alarm Using RF Module the first block
is power supply in which the input is 230V AC
which is step down using the transformer (12-
0-12)
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www. Kitsguru.com
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