RF based Wireless Robot using 8051 Microcontroller with circuit diagram and code.

1. Presentation
On
Microcontroller 8051
Presented By -
Rahul Kumar
B.Tech /ECE
1325271
Department Of ECE
Shaheed Udham Singh College of Engg. & Tech.

2. EMBEDDED SYSTEM
• Special-purpose computer system designed
to perform a dedicated function.
• Performs one or a few pre-defined tasks,
usually with very specific requirements, and
often includes task-specific hardware and
mechanical parts not usually found in a
general-purpose computer.

3. INTRODUCTION TO 8051
• 4K bytes internal ROM
• 128 bytes internal RAM
• Four 8-bit I/O ports (P0 - P3).
• Two 16-bit timers/counters
• One serial interface
Microcontroller
A single chip
RAM
I/O
Port
Timer
Serial
COM
Port
CPU ROM

4. Pin Description of the 8051

5. Inside Structure of 8051 Microcontroller

6. Software Used
• KEIL uVISION

7. PROJECT :- RF Based Car
Team Members :-
Rahul Kumar
Sahil Kumar
Karan Dhall

8. Components
• AT89c51
• Battery
• LED(6)
• HT12E
• HT12D
• L293D
• Resistors
1 k ohm(7)
10 k ohm
50 k ohm
100 k ohm
• Xtal – 11.0592 KHz
• Tectile switch (5)
• DC motors
• Voltage Regulator(IC7805)
• Wheels and chechis
• Capacitors
1 n f
10 uf
1uf
33pf(2)

9. Introduction of IC HT12E
• HOLTEK Semiconductor.
• HT12E is a encoder integrated circuit that
belongs to 212 series of encoders.
• They are paired with 212 series of decoders
for use in remote control system
applications.
• HT12E converts the parallel input into serial
outputs. It encodes the parallel data into
serial for transmission through an RF
transmitter.

10. Pin Diagram:

11. Introduction of IC HT12D
• HT12D is a decoder integrated circuit that
belongs to 212 series of decoders.
• This series of decoders are mainly used for
remote control system applications.
• HT12D converts the serial input into
parallel outputs. It decodes the serial
addresses and data received by an RF
receiver, into parallel data and sends them
to output data pins.

12. Pin Diagram:
HT12D

13. Pin
No
Function Name
1
8 bit Address pins for input
A0
2 A1
3 A2
4 A3
5 A4
6 A5
7 A6
8 A7
9 Ground (0V) Ground
10
4 bit Data/Address pins for output
D0
11 D1
12 D2
13 D3
14 Serial data input Input
15 Oscillator output Osc2
16 Oscillator input Osc1
17 Valid transmission; active high VT
18 Supply voltage; 5V (2.4V-12V) Vcc
Pin Description of both:

14. HT12E/HT12D FEATURES:
• Operating voltage: 2.4V~12V
• Low power and high noise immunity.
• Low standby current.
• Capable of decoding 12 bits of information.
• Binary address setting.
• Received codes are checked 3 times.
• 8 address bits and 4 data bits.
• Built-in oscillator needs only 5% resistor.
• Valid transmission indicator.

15. RF Transmission and Reception

16. RF Transmitter
1 2 3 4
Block Diagram Of RF Transmitter RF Transmitter Module

17. RF Receiver
1 2 3 4 5 6 7 8
RF Receiver ModuleBlock Diagram of RF Receiver

18. Interfacing Of HT12E with RF Tx

19. Interfacing Of HT12D with RF Rx

20. L293D
• L293D is a motor driver. As its name
suggests it can drive a motor .
• Since the output voltage of 8051 is
limited to 5V only thus motors with
higher required voltage need some
drivers to provide them their desired
input voltage.
• What L293D does is, it takes the
(0/5v) input from the output pins
of 8051 microcontroller and forwards
the output through itself of higher
voltage.
• Connecting a DC motor directly to
the pins of 8051 would not work. It
may even damage the
microcontroller.

21. Interfacing of 8051 with L293D

22. Transmitter Hardware
Remote

23. Receiver Hardware
CAR

24. PROGRAM CODE
#include<reg51.h>
sbit sw1=P1^4;
sbit sw2=P1^5;
sbit sw3=P1^6;
sbit sw4=P1^7;
sbit m1=P1^0;
sbit m2=P1^1;
sbit m3=P1^2;
sbit m4=P1^3;
void main()
{
m1=m2=m3=m4=0;
while(1)
{
if(sw1==1)
{
m1=1;
}
else
{
m1=0;
}
if(sw2==1)
{
m2=1;
}
else
{
m2=0;
}
if(sw3==1)
{
m3=1;
}
else
{
m3=0;
}
if(sw4==1)
{
m4=1;
}
else
{
m4=0;
}
}
}

25. WORKING VIDEO

26. Applications of RF Module
• Data
Communication
• Escalators &
Elevators
• Military
• Security Monitoring
• Unmanned Vehicles
Receiver Transmitter

27. Future Developments
• Spy cameras can be added for security
purpose.
• GPS Module can be added to get the
location or to move the car to a specific
location.
• For Military , Remote weapons can be
added to use as fighter Robo car.

28. THANKS
FOR YOUR PRECIOUS TIME