LIST OF FIGURES

Figure TITLE Page No.

Figure 3.1 Block diagram 16

Figure 3.2 Encoder HT 12E 26

Figure 3.3 Address and Data of Micro Controller 27

Figure 3.4 Transmission Timing for the HT12E 28

Figure 4.1 433 MHz Transmitter 29

Figure 4.2 433 MHz RF Receiver 30

Figure 4.3 HT12D Controller 31

Figure 4.4 HT12D Pin Diagram 32

Figure 4.5 PIC16F73 Block Diagram 33

Figure 4.6 Working of relay 36

Figure 5.1 Unregulated power supply 38

Figure 5.2 Regulated power supply 38

Figure 5.3 ic-7809 as a regulator 38