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8051 baesd led blinking with 555 timer controlled problem...

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R

rohansinha2000

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hi,

org 0000h
start:Setb P3.0 ; send '1' to P0.0
call delay; call delay time
setb P3.1 ;
call delay;
setb P3.2 ;
call delay;
setb P3.3 ;
call delay;
setb P3.4 ;
call delay;
setb P3.5 ;
call delay;
setb P3.6 ;
call delay;
setb P3.7 ;
call delay;
call delay;
call delay;
call delay;
call delay;
call delay;
Clr P3.7 ;
call delay;
Clr P3.6 ;
call delay;
Clr P3.5 ;
call delay;
Clr P3.4 ;
call delay;
Clr P3.3 ;
call delay;
Clr P3.2 ;
call delay;
Clr P3.1 ;
call delay;
Clr P3.0 ;
call delay;
sjmp start; loooooop forever to start
delay: mov R1,#0FFH
del1: mov R2,#0FFH
del2: djnz R2,del2
djnz R1,del1
ret
end
i need to add 555 timer with it. plz help me out .thanks
 

Re: 8051 baesd led blinking with 555 timer controlled proble

And what this 555-timer suppose to do there :?:
 

I think you don't need a 555-timer for the running LEDs you are implementing.

Or maybe you want something to happen.

Is there any? Just let me know.

thank you.
 

Re: 8051 baesd led blinking with 555 timer controlled proble

if you want to blink an led you should use the timer of 8051 itself or make a loop of few thousand to create some delay. there is no need of 555 timer.
 

Re: 8051 baesd led blinking with 555 timer controlled proble

i want controlled speed externally by 555 timer and preset controlled.if i use 8051 delay and timer then it will be a constant speed.
 

Re: 8051 baesd led blinking with 555 timer controlled proble

You can program 8051 to have delay(s) dependant on two pins: increase and decrease ..
Adding external timer to change something while a microcontroller is seating nearby doesn’t make sense ..

Rgds,
IanP
:|
 

Re: 8051 baesd led blinking with 555 timer controlled proble

but sometimes it is essential. so i need code for 555 timer with 8051
 

Re: 8051 baesd led blinking with 555 timer controlled proble

You can replace the delay function by a wait_for_external_event function. It could e.g. wait for an external interupt flag triggered
by the 555 timer and reset it. You see, I left something for you.
 

Re: 8051 baesd led blinking with 555 timer controlled proble

plz give me external interupt flag sample code. it will help me.
 

Re: 8051 baesd led blinking with 555 timer controlled proble

here you go.
connect your 555 pin3 to P3.1 timing of output sequence will be conrolled through
555ic.
Regards.

;************************************************************************************************
; 89c2051 BASED FALSHER
; PROGRAM NAME : FAL620.ASM
;************************************************************************************************
;
;
;************************************************************************************************
; PROGRAM ENTRY POINT
;************************************************************************************************
;
ORG 0000H ;System reset RST
AJMP MAIN
;
;************************************************************************************************
; EXTERNAL 0 INTERRUPT VECTOR AT 03H
;************************************************************************************************
; ORG 0003H
; MOV P1,#11111111B
; JNB P3.2,$
; MOV P1,#00000000B
; RETI
;************************************************************************************************
; MAIN PROGRAM
;************************************************************************************************
ORG 0030H ; PROGRAM ENTRY POINT
;************************************************************************************************
; SEQUENCE: 1
;************************************************************************************************
MAIN:
MOV P1,#0FFH ; INITALIZING PORTS
MOV P3,#0FFH
MOV SP,#30H
; SETB EX0
; SETB EA
; CLR IT0
MOV R0,#3
SEQ_1:
MOV A,#00000001B
CALL OUTPUT
MOV A,#00000010B
CALL OUTPUT
MOV A,#00000100B
CALL OUTPUT
MOV A,#00001000B
CALL OUTPUT
MOV A,#00010000B
CALL OUTPUT
MOV A,#00100000B
CALL OUTPUT
MOV A,#00110000B
CALL OUTPUT
MOV A,#00101000B
CALL OUTPUT
MOV A,#00100100B
CALL OUTPUT
MOV A,#00100010B
CALL OUTPUT
MOV A,#00100001B
CALL OUTPUT
MOV A,#00100011B
CALL OUTPUT
MOV A,#00100101B
CALL OUTPUT
MOV A,#00101001B
CALL OUTPUT
MOV A,#00110001B
CALL OUTPUT
MOV A,#00111001B
CALL OUTPUT
MOV A,#00110101B
CALL OUTPUT
MOV A,#00110011B
CALL OUTPUT
MOV A,#00110111B
CALL OUTPUT
MOV A,#00111011B
CALL OUTPUT
MOV A,#00111111B
CALL OUTPUT
DJNZ R0,SEQ_1
;************************************************************************************************
; SEQUENCE: 2
;************************************************************************************************
MOV R0,#3
SEQ_2:
MOV A,#00000001B
CALL OUTPUT
MOV A,#00000010B
CALL OUTPUT
MOV A,#00000100B
CALL OUTPUT
MOV A,#00001000B
CALL OUTPUT
MOV A,#00010000B
CALL OUTPUT
MOV A,#00100000B
CALL OUTPUT
MOV A,#00100001B
CALL OUTPUT
MOV A,#00100010B
CALL OUTPUT
MOV A,#00100100B
CALL OUTPUT
MOV A,#00101000B
CALL OUTPUT
MOV A,#00110000B
CALL OUTPUT
MOV A,#00110001B
CALL OUTPUT
MOV A,#00110010B
CALL OUTPUT
MOV A,#00110100B
CALL OUTPUT
MOV A,#00111000B
CALL OUTPUT
MOV A,#00111001B
CALL OUTPUT
MOV A,#00111010B
CALL OUTPUT
MOV A,#00111100B
CALL OUTPUT
MOV A,#00111101B
CALL OUTPUT
MOV A,#00111110B
CALL OUTPUT
MOV A,#00111111B
CALL OUTPUT
DJNZ R0,SEQ_2
;************************************************************************************************
; SEQUENCE: 3
;************************************************************************************************
MOV R0,#3
SEQ_3:
MOV A,#00010000B
CALL OUTPUT
MOV A,#00001000B
CALL OUTPUT
MOV A,#00000100B
CALL OUTPUT
MOV A,#00000010B
CALL OUTPUT
MOV A,#00000001B
CALL OUTPUT
MOV A,#00100001B
CALL OUTPUT
MOV A,#00010001B
CALL OUTPUT
MOV A,#00001001B
CALL OUTPUT
MOV A,#00000101B
CALL OUTPUT
MOV A,#00000011B
CALL OUTPUT
MOV A,#00100011B
CALL OUTPUT
MOV A,#00010011B
CALL OUTPUT
MOV A,#00001011B
CALL OUTPUT
MOV A,#00000111B
CALL OUTPUT
MOV A,#00100111B
CALL OUTPUT
MOV A,#00010111B
CALL OUTPUT
MOV A,#00001111B
CALL OUTPUT
MOV A,#00101111B
CALL OUTPUT
MOV A,#00011111B
CALL OUTPUT
MOV A,#00111111B
CALL OUTPUT
DJNZ R0,SEQ_3
;************************************************************************************************
; SEQUENCE: 4
;************************************************************************************************
MOV R0,#3
SEQ_4:
MOV A,#00000001B
CALL OUTPUT
MOV A,#00000011B
CALL OUTPUT
MOV A,#00000111B
CALL OUTPUT
MOV A,#00001111B
CALL OUTPUT
MOV A,#00011111B
CALL OUTPUT
MOV A,#00111111B
CALL OUTPUT
MOV A,#00011111B
CALL OUTPUT
MOV A,#00001111B
CALL OUTPUT
MOV A,#00000111B
CALL OUTPUT
MOV A,#00000011B
CALL OUTPUT
MOV A,#00000001B
CALL OUTPUT
DJNZ R0,SEQ_4
;************************************************************************************************
; SEQUENCE: 5
;************************************************************************************************
MOV R0,#3
SEQ_5:
MOV A,#00100000B
CALL OUTPUT
MOV A,#00110000B
CALL OUTPUT
MOV A,#00111000B
CALL OUTPUT
MOV A,#00111100B
CALL OUTPUT
MOV A,#00111110B
CALL OUTPUT
MOV A,#00111111B
CALL OUTPUT
MOV A,#00111110B
CALL OUTPUT
MOV A,#00111100B
CALL OUTPUT
MOV A,#00111000B
CALL OUTPUT
MOV A,#00110000B
CALL OUTPUT
MOV A,#00100000B
CALL OUTPUT
DJNZ R0,SEQ_5
;************************************************************************************************
; SEQUENCE: 6
;************************************************************************************************
MOV R0,#3
SEQ_6:
MOV A,#00111111B
CALL OUTPUT
MOV A,#00011111B
CALL OUTPUT
MOV A,#00101111B
CALL OUTPUT
MOV A,#00110111B
CALL OUTPUT
MOV A,#00111011B
CALL OUTPUT
MOV A,#00111101B
CALL OUTPUT
MOV A,#00111110B
CALL OUTPUT
DJNZ R0,SEQ_6
;************************************************************************************************
; SEQUENCE: 7
;************************************************************************************************
MOV R0,#3
SEQ_7:
MOV A,#00111111B
CALL OUTPUT
MOV A,#00111110B
CALL OUTPUT
MOV A,#00111101B
CALL OUTPUT
MOV A,#00111011B
CALL OUTPUT
MOV A,#00110111B
CALL OUTPUT
MOV A,#00101111B
CALL OUTPUT
MOV A,#00011111B
CALL OUTPUT
DJNZ R0,SEQ_7
;************************************************************************************************
; SEQUENCE: 8
;************************************************************************************************
MOV R0,#4
SEQ_8:
MOV A,#00000111B
CALL OUTPUT
MOV A,#00111000B
CALL OUTPUT
DJNZ R0,SEQ_8
;************************************************************************************************
; SEQUENCE: 9
;************************************************************************************************
MOV R0,#3
SEQ_9:
MOV A,#00000001B
CALL OUTPUT
MOV A,#00000011B
CALL OUTPUT
MOV A,#00000111B
CALL OUTPUT
MOV A,#00001111B
CALL OUTPUT
MOV A,#00011111B
CALL OUTPUT
MOV A,#00111111B
CALL OUTPUT
MOV A,#00111110B
CALL OUTPUT
MOV A,#00111100B
CALL OUTPUT
MOV A,#00111000B
CALL OUTPUT
MOV A,#00110000B
CALL OUTPUT
MOV A,#00100000B
CALL OUTPUT
DJNZ R0,SEQ_9
;************************************************************************************************
; SEQUENCE: 10
;************************************************************************************************
MOV R0,#3
SEQ_10:
MOV A,#00100000B
CALL OUTPUT
MOV A,#00110000B
CALL OUTPUT
MOV A,#00111000B
CALL OUTPUT
MOV A,#00111100B
CALL OUTPUT
MOV A,#00111110B
CALL OUTPUT
MOV A,#00111111B
CALL OUTPUT
MOV A,#00011111B
CALL OUTPUT
MOV A,#00001111B
CALL OUTPUT
MOV A,#00000111B
CALL OUTPUT
MOV A,#00000011B
CALL OUTPUT
MOV A,#00000001B
CALL OUTPUT
DJNZ R0,SEQ_10
;************************************************************************************************
; SEQUENCE: 11
;************************************************************************************************
MOV R0,#4
SEQ_11:
MOV A,#00111111B
CALL OUTPUT
MOV A,#00000000B
CALL OUTPUT
DJNZ R0,SEQ_11
;************************************************************************************************
; SEQUENCE: 12
;************************************************************************************************
MOV R0,#3
SEQ_12:
MOV A,#00111110B
CALL OUTPUT
MOV A,#00111101B
CALL OUTPUT
MOV A,#00111011B
CALL OUTPUT
MOV A,#00110111B
CALL OUTPUT
MOV A,#00101111B
CALL OUTPUT
MOV A,#00011111B
CALL OUTPUT
MOV A,#00101111B
CALL OUTPUT
MOV A,#00110111B
CALL OUTPUT
MOV A,#00111011B
CALL OUTPUT
MOV A,#00111101B
CALL OUTPUT
MOV A,#00111110B
CALL OUTPUT
DJNZ R0,SEQ_12
;************************************************************************************************
; SEQUENCE: 13
;************************************************************************************************
MOV R0,#3
SEQ_13:
MOV A,#00011111B
CALL OUTPUT
MOV A,#00101111B
CALL OUTPUT
MOV A,#00110111B
CALL OUTPUT
MOV A,#00111011B
CALL OUTPUT
MOV A,#00111101B
CALL OUTPUT
MOV A,#00111110B
CALL OUTPUT
MOV A,#00111101B
CALL OUTPUT
MOV A,#00111011B
CALL OUTPUT
MOV A,#00110111B
CALL OUTPUT
MOV A,#00101111B
CALL OUTPUT
MOV A,#00011111B
CALL OUTPUT
DJNZ R0,SEQ_13
;************************************************************************************************
; JUMP TO START
;************************************************************************************************
JMP MAIN
;************************************************************************************************
; ROUTINE FOR OUTPUT THE SEQUENCE
;************************************************************************************************
;
OUTPUT:
XRL A,#0FFH ;IN CASE OF 2051 CIRCUIT
MOV P1,A
JNB P3.2,FULL
JB P3.1,$
JNB P3.2,FULL
JNB P3.1,$
JNB P3.2,FULL
RET
;************************************************************************************************
; ROUTINE FOR BREAK
;************************************************************************************************
;
FULL: MOV P1,#11000000B
JNB P3.2,$
MOV P1,#11111111B
RET
;************************************************************************************************
; END OF PROGRAM
;************************************************************************************************
END
 

Re: 8051 baesd led blinking with 555 timer controlled proble

thanks to reply me sir. now i can guess how to use 555 in 8051. if u have more example ple send us in here.
 

Re: 8051 baesd led blinking with 555 timer controlled proble

ORG 0000H ;System reset RST
AJMP start
ORG 0003H
MOV P1,#11111111B
JNB P3.7,$
MOV P1,#00000000B
RETI
ORG 0030H
start:
Setb P1.0
Clr P1.1
call delay;
Setb P1.1
Clr P1.2
call delay;
Setb P1.2
Clr P1.3
call delay;
Setb P1.3
Clr P1.0
call delay,
ljmp start;
delay:
XRL A,#0FFH ;IN CASE OF 2051 CIRCUIT
MOV P1,A
JNB P3.7,FULL
JB P3.1,$
JNB P3.7,FULL
JNB P3.1,$
JNB P3.7,FULL
RET
FULL: MOV P1,#11000000B
JNB P3.7,$
MOV P1,#11111111B
RET
END


that code is not working for me.why?
 

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