The document discusses serial and parallel communication, describing that serial communication transmits one data bit at a time while parallel communicates multiple bits simultaneously, with serial being slower but requiring fewer cables. It also outlines the pin configurations and functions of RF transmitter and receiver modules, encoder and decoder chips, and provides examples of how RF modules can be used to transmit data wirelessly between devices like in an RC car where the transmitter sends input data to the receiver to control motors.

1. RF MODULE
INTERFACING

5. SERIAL/PARALLEL COMMUNICATION
Serial Communication
Parallel Communication
1. One data bit is
transceived at a time
1. Multiple data bits are
transceived at a time
2. Slower
2. Faster
3. Less number of cables
required to transmit data
3. Higher number of
cables required

6. RF MODULE PIN CONFIGURATION
(TRANSMITTER)
Pin No.
Name
Function
1
GND
Ground (0V)
2
DATA
Serial Data Input
3
VCC
Supply Voltage (5V)
4
ANT
Antenna Output

7. RF MODULE PIN CONFIGURATION
(RECEIVER)
Pin No.
Name
Function
1
GND
Ground (0V)
2
Data
Serial Data Output
3
Data (NC)
Serial Data Output (No Connection)
4
Vcc
Supply Voltage (5V)
5
Vcc
Supply Voltage (5V)
6
GND
Ground (0V)
7
GND
Ground (0V)
8
ANT
Antenna Input

8. HT12E (PIN DESCRIPTION)
Pin No.
Pin Name
Description
1-8
A0 ~A7
Input pins for Address settings
9
VSS
Negative power supply, ground
10-13
AD8~AD11
Input pins for data D8~D11 setting
and transmission enable, active
low (These pins should be
externally set to VSS or left open)
14
TE
Transmission enable, active low
16
OSC1
Oscillator input pin
15
OSC2
Oscillator output pin
17
DOUT
Encoder data serial transmission
output
18
VDD
Positive power supply

10. HT12D (PIN CONFIGURATION)
Pin No.
Pin Name
Description
1-8
A0 ~A7
Input pins for Address settings
9
VSS
Negative power supply, ground
10-13
D8~D11
Output data pins, power-on state
is low.
14
DIN
Serial data input pin
16
OSC1
Oscillator input pin
15
OSC2
Oscillator output pin
17
VT
Valid transmission, active high
18
VDD
Positive power supply

11. +9 Volts
Ground

12. RF Transmitter
RF Receiver
Encoder
Decoder
Microcontroller
Microcontroller
Input
Output

13. RF CAR
RF Transmitter
Encoder
RF Receiver
Decoder
Motor Driver
Input
Output (To
Motors)