controling 2 relay with microcontroller

[Smart]

I need complete schematic and code for a microcontroller which has a link with a pc via RS-232, and pc send a command for microcontroller to control 2 pcs of 24 volt relay.

 

[dafahmi]

hello,

reference link:
www.8052.com
**broken link removed**

regards

 

[pouchito]

it is better to specify which microcontroller you are planning to use, to send a corresponding code.

 

[nomad13]

Please indicate what microcontroller do you intend to use and the code language.

 

[yogi]

avr microcontroller connection with RS-232
**broken link removed**

for relay use this circuit
**broken link removed**

Bibin John
www.bibinjohn.tk

 

[abidr]

I dont think anyone would do the entire thing for you, however here is some help connect PIC (i presume) to PC via DS232.
Connect 2 pins of mcu to OCTAL high side driver like 2803,
deifne logic in program to await for input 1, 2
if input is 1 make pinx(connected) to relay 1 Via 2803 as high other should be low and vice a versa.
Its very simple if you have logical thinking and concentrate a bit on what you want to achieve.
I have quoted the example for PIC mcu but logic and circuitary would remain the same for all mcus.
here is some additional help:
http://www.scienceprog.com/drive-relay-with-avr-microcontroller/#article

 

[pakitos]

what are you trying to do Nomad?
paraphrasing Pouchito's sentence to get points?

 

[shafee001]

dear,
this is a code interfacing 8952 to serial port of pc

#INCLUDE "8051EQU.INC"
; RESET                         ;reset routine
   .ORG   0H                    ;locate routine at 00H
    AJMP   START                ;jump to START 
;
;**************************************************************************
;
; INTERRUPTS  (not used)        ;place interrupt routines at appropriate
                                ;memory locations
   .ORG   03H                   ;external interrupt 0
    RETI
   .ORG   0BH                   ;timer 0 interrupt
    RETI
   .ORG   13H                   ;external interrupt 1
    RETI
   .ORG   1BH                   ;timer 1 interrupt
    RETI
   .ORG   23H                   ;serial port interrupt
    RETI
   .ORG   25H                   ;locate beginning of rest of program
;
;**************************************************************************
;
INITIALIZE:                     ;set up control registers
;
    MOV   TCON,#00H
    MOV   TMOD,#00H
    MOV   PSW,#00H             
    MOV   IE,#00H               ;disable interrupts
    MOV   P1,#0FCH
    
    RET
;**************************************************************************
;
START:                          ;main program (on power up, program starts at this point)
   ACALL INITIALIZE             ;set up control registers 
	MOV TMOD,#20H
	MOV TCON,#41H
	MOV TH1,#0FDH
	MOV SCON,#50H
	ACALL DELAY1S

   CLR TI
   MOV SBUF,#'1'
   JNB TI,$
   CLR TI
   MOV SBUF,#'2'
   JNB TI,$

   CLR TI
   MOV SBUF,#'3'
   JNB TI,$
   CLR TI
end.

use uln 2003 to interface relays with mc
don't foget to add diode (inverse polarity) paraller with relay coil