Accident Avoiding

8/9/2019 Accident Avoiding

1/28

Over speed indication andAutomatic accident Avoiding

System for four wheeler

Presented By


2/28

Components Used:• Microcontroller AT89C51• Crystal Oscillator (11.059 M !"• Ceramic Capacitor (## P$"

• Po%er &'pply (5 "• )eset &%itc• Ultrasonic &ensor(10 meter ran*e"• +eypad • )elay &%itc• ,c Motor • -C /9#d • C, ,isplay (/ 1 "


3/28

Ad2anta*es o$ Microcontroller

3ased &ystem• As t e perip erals are inte*rated into a sin*le c ip4 t e o2erall

system cost is 2ery less• T e prod'ct is o$ small si!e compared to micro processor 3ased

system• T e system desi*n no% re 'ires 2ery little e$$orts• As t e perip erals are inte*rated %it a microprocessor t e

system is more relia3le• T o'* microcontroller may a2e on c ip )OM4)AM and -6O

ports4 addition )OM4 )AM -6O ports may 3e inter$acede ternally i$ re 'ired

• On c ip )OM pro2ide a so$t%are sec'rity


4/28

8051 Basic Component

• 7+ 3ytes internal )OM • 1/8 3ytes internal )AM • o'r 8 3it -6O ports (P0 P#".• T%o 1 3it timers 6co'nters• One serial inter$ace

• 7 e ternal memory $or code• 7 e ternal memory $or data• /10 3it addressa3le

Microcontroller


5/28

5

T e 3asic 8051 Core• 8-bit CPU optimized for control applications• Capability for single bit Boolean operations.• Supports up to 6 ! of program memory.• Supports up to 6 ! of data memory.

• ! bytes of on-c"ip program memory.• #e$er de%ices pro%ide more.

• &'8 or '56 bytes of on-c"ip data ()*• +our 8 bit ports.

• ,$o &6-bit timer counters• U)(,• nterrupts• /n-c"ip cloc0 oscillator


6/28

Bloc ,ia*ram

CPU

On-chipRAM

On-chipROM forprogramcode

4 !O Ports

"imer #

SerialPortOSC

nterruptControl

$%ternal interrupts

"imer &

"imer!Counter

'us

Control

"%( R%(P# P& P) P*

Address!(ata

Counternputs


7/28

8051Schematic

Pin out


8/28

8051

Foot Print

1234567891011121314151617181920

4039383736353433323130292827262524232221

P1.0P1.1P1.2P1.3P1.4P1.5P1.6P1.7RST

(RXD)P3.0(TXD)P3.1

(T0)P3.4(T1)P3.5

XTAL2XTAL1

GND

(INT0 )P3.2(INT1 )P3.3

(RD )P3.7(WR )P3.6

VccP0.0 (AD0)P0.1 (AD1)P0.2 (AD2)P0.3 (AD3)P0.4 (AD4)P0.5 (AD5)P0.6 (AD6)P0.7 (AD7)EA/VPPALE/PROG

PSENP2.7 (A15 )P2.6 (A14)P2.5 (A13)P2.4 (A12)P2.3 (A11 )P2.2 (A10 )P2.1 (A9)P2.0 (A8)

8051(8031)(8751)(8951)


9/28

Po%er On );&;T Circ'it

12 p+

12 p+

8.' !

&2 u+3

4cc

&&.25 ' * z

7) 4PP&

'

(S,

1&

&

&8


10/28

Port 0 %it P'll Up )esistors

P2.2P2.&P2.'P2.1P2.P2.5

P2.6P2.9

(S+###

, +&

,.+&

/cc 0

P or

t #


11/28

IMPORTANT PINS (IO Ports IMPORTANT PINS (IO Ports

• Port 0 Port 0 pins #/ #9 pins #/ #9 P0.0 P0.0 P0.< P0.<

: 8 3it )6= >eneral8 3it )6= >eneral P'rpose -6O P'rpose -6O

: Or Or acts as a m'ltiple edacts as a m'ltiple ed

lo% 3ytelo% 3yte addressaddress andand datadata 3's $or3's $or e ternal e ternal memorymemorydesi*ndesi*n

One of the most useful features of the ,#+& is that it contains

four !O ports 1P# - P*2$ach port can 3e used as input or output 13i-direction2


12/28


• Port 1 Port 1 pins 1 8 pins 1 8 P1.0 P1.0 P1.< P1.<

: OnlyOnly 8 3it )6= 8 3it )6=

>eneral P'rpose -6O>eneral P'rpose -6O


13/28


14/28


• Port # Port #• pins 10 1< pins 10 1< P#.0 P#.0

P#.< P#.<

: >eneral P'rpose -6O>eneral P'rpose -6O

: i$ not 'sin* any o$ t ei$ not 'sin* any o$ t einternal perip eralsinternal perip erals(timers" or e ternal(timers" or e ternal

interr'pts.interr'pts.


15/28

Port ! A"ternate Functions


16/28

• A ; Address latc ena3le to select 2alid address• ;A6 pp ; ternal access ena3le

;A 0 e ec'te pro*ram in e ternal memory ;A 1 e ec'te pro*ram in internal memory

pp it recei2es /1 $or on c ip ;P)OM P&;? Pro*ram store ena3lestore to read t e e ternal pro*ram memory


17/28

Registers

)

B

(2

(&

(1

(

('

(5

(9

(6

;P ;P<

PC

;P,(

PC

Some 825& &6-bit (egister

Some 8-bitt (egisters oft"e 825&


18/28

;ata memory

*

;**/4 )=6'

*/4 (&=>6'*/4 )?(&

*/4 )=2)'

*/4 (&=>2)'*/4 )?(&


19/28

Ultrasonic &ensor


20/28

• P-?> 'ltrasonic distance sensor pro2ides precise distance meas'rements $rom a3o't /cm (0.8 inc es" to 10 meters .

• -t %or s 3y transmittin* an 'ltrasonic 3'rstand pro2idin* an o'tp't p'lse t atcorresponds to t e time re 'ired $or t e 3'rstec o to ret'rn to t e sensor.

• By meas'rin* t e ec o p'lse %idt t edistance to tar*et can easily 3e calc'lated.


21/28

-nter$acin* a +eypad

1 eys arran*ed as a7@7 matri

Place a 0 on )0 port

)ead C port

-$ t ere is a 0 3itt en t e 3'ttonat t e col'mn6ro%intersection as3een pressed.

Ot er%ise4 try ne t ro% )epeat constantly

C &C '

C 1

C

( &

( '

( 1

(


22/28

C, -nter$acin* • i 'id Crystal ,isplays ( C,s"

• c eap and easy %ay to display te t

• ario's con$i*'rations (1 line 3y /0 @ c ar 'p to8 lines @ 80"

• -nte*rated controller

• T e display as t%o re*ister

: command re*ister

: data re*ister

• By )& yo' can select re*ister

• ,ata lines (,B< ,B0" 'sed to trans$er data andcommands


23/28

Alp an'meric

C, -nter$acin*

7

( @

(S

;B9:;B2


24/28

Pino't 8 data pins ,


25/28

C, Commands

• T e C, s internal controller can accept se2eral commands andmodi$y t e display accordin*ly. &'c as: : Clear screen

: )et'rn ome : ,ecrement6-ncrement c'rsor

• A$ter %ritin* to t e C,4 it ta es some time $or it to complete itsinternal operations. ,'rin* t is time4 it %ill not accept any ne%commands or data. : =e need to insert time delay 3et%een any t%o commands or

data sent to C,


26/28

Pin ,escription


27/28

Command Codes

SAC7,


28/28

-nter$acin* C, %it 8051

SAC7,

C(

P&5 -P&5#( -(#

R6

RS

$

P*54

P*5+

P*5*

,#+&

Documents

Accident Avoiding