The document presents information on embedded systems and robotics. It discusses embedded systems, microprocessors, microcontrollers including the 8051 microcontroller. It then describes a project to build a DTMF controlled robot car using an 8051 microcontroller, motors, and other electronic and mechanical parts. The programming and circuit diagram used to control the robot car with DTMF signals is also presented.

1. Presentation on
Embedded System & Robotics
Submitted To:- Submitted By:-
Miss Nisha Dalal Neeraj Khatri
926/ECE/10

2. Introduction
Embedded System:-
◦ Type of Computer System
◦ Combination of microprocessor based
hardware & suitable software

3. Different Embedded Based Devices

4. Microprocessor
 Is a device which performs Arithmetic & Logic Operations.
◦ No inbuilt RAM
◦ No inbuilt ROM
◦ No inbuilt I/O ports
◦ Bulkier & Expensive

5. Microcontroller
 isdefined as combination of Microprocessor & its external
units.
◦ Inbuilt RAM
◦ Inbuilt ROM
◦ Inbuilt I/O ports

6. 8051 Microcontroller
4-bit processor
128-byte of RAM
4-Kilobyte of onchip ROM
Two Timers
4 I/O ports
1 Serial port
6 interupts

7. Internal Architecture
CPU
◦ ALU
◦ CU
◦ MU
3 Buses
◦ Data bus
◦ Address bus
◦ Control bus

8. Pin Diagram
AT89C51 IC is a 40 pin IC.
DIP (Dual In-line package)
4 ports
2 supply pins
2 crystal pins
1 reset pin
3 control signal

9. Interrupts
Any kind of emergency is called Interrupts.
◦ 6 interrupts
 RST 0000H
 INT0 0003H
 TF0 000BH
 INT1 0013H
 TF1 001BH
 Serial (TI & RI) 0023H

10. Project
DTMF based ROBO Car
◦ On pressing 2, the robot will move forward
◦ On pressing 4, the robot will turn left
◦ On pressing 6, the robot will turn right
◦ On pressing 8, the robot will move
backwards
◦ On pressing 5, the robot will stop

11. Electronics Part
1H bridge
DTMF decoder
8051 Microcontroller

12. Mechanical Part
Plywood Board 9cm x 7cm
2 DC motor 12V, 100rpm
2 Simple Wheels
1 Caster Wheel
Nut & Bolts
2 Clamper

14. Assembly of all parts

15. Program
M1CW EQU P0.0
M1CCW EQU P0.1
M2CW EQU P0.2
M2CCW EQU P0.3
ORG 0000H
MAIN: MOV A,P2
CJNE A,#0F2H,NXT1
AJMP FWD
NXT1: CJNE A,#0F4H,NXT2
AJMP LFT
NXT2: CJNE A,#0F8H,NXT3
AJMP REW
NXT3: CJNE A,#0F6H,NXT4
AJMP RGT

16. NXT4: CJNE A,#0F5H,MAIN
AJMP STP
FWD: SETB M1CCW
SETB M2CCW
CLR M1CW
CLR M2CW
AJMP MAIN
REW: SETB M1CW
SETB M2CW
CLR M1CCW
CLR M2CCW
AJMP MAIN
RGT: SETB M2CCW
SETB M1CW
CLR M2CW
CLR M1CCW
AJMP MAIN

17. LFT: SETB M2CW
SETB M1CCW
CLR M2CCW
CLR M1CW
AJMP MAIN
STP: MOV P0,#11111111B
AJMP MAIN