It's a Presentation Of Actual Project. An RF module is a small electronic circuit used to transmit, receive, or transceive radio waves on one of a number of carrier frequencies. RF modules are widely used in consumer applications such as garage door openers, wireless alarm systems, industrial remote controls, smart sensor applications, weather monitoring system, RFID, wireless mouse technology and wireless home automation systems. They are often used instead of infrared remote controls as they have the advantage of not requiring line-of-sight operation.

1. Six Weeks Summer Training Project

3. Wireless RF Module Using PIC Controller !
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Harvard
Program
Data Program CPU & Data
CPU
Memory Memory Memory

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Printed Circuit Board

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CAPACITOR
Light-Emitting Diode

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RESISTORS
Battery

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LIQUID CRYSTAL DISPLAY

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BX R433A

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ULN2801A

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RELAY

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HT12E SERIES OF ENCODER

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HT12D SERIES OF DECODERS

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PIC16F73

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But Wait, We Are Not Laymen !
We Are Engineers Instead .
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Wireless

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Cost
Easy Effectivene
Ionization ss
With Air
Skin
Effect
Very long
Range
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Wireless

27. Wireless RF Module Using PIC Controller !
Relation b/w Frequency & Wavelength :
The distance a radio wave will travel during one
cycle.
λ
c = 3x10 pow(8) = speed of light (meters per second)
f = receive frequency (Hertz)
λ = wavelength (meters)
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Wireless

28. Wireless RF Module Using PIC Controller !
GND - Ground Vcc – Voltage Supply (+5V) Data – I/O Signal
NC- No Connection (0V) Transfer Rate – 10Kbps ANT - Antenna
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Wireless

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Wireless

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 The encoders are a series of CMOS
LSIs for remote control system
applications.
 Four switches D0, D1, D2 and D3 to
give 4-bit parallel data (D0-D3).
 The Transmitter Enable (TE, pin 14)
pin is an active low pin.
 A resistance as high as 1M ohm is
required in between OSC1 and OSC2
pins.
 The address pins MUST have the same
address in both transmitter and receiver.
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Wireless

31. Wireless RF Module Using PIC Controller !
 Decoders compare the serial
input data three times
continuously with their local
addresses.
 Capacitor (0.01uF) is used
between Vcc and GND for
noise filtering.
 Pin 17 (VT) is enabled
whenever the receiver
receives any data.
 HT12D is arranged to provide 8
address bits and 4 data bits.
 Address pins (A0-A7, pin 1-
8) are grounded.
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Wireless

32. Wireless RF Module Using PIC Controller !
Data From PIC MCU ULN 280
Receiver
• Parallel • The CPU
Data
• Relay
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Wireless

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