numanali

hi everyone...my friend give me a task to install a an alarm circuit i his little industry.....he gave me instructions that a circuit should alarm after every 30 minutes,and it must only stops when any worker press the button,and when button is pressed the timer must restart ...every time a button is pressed. ckt should acknowledge the computer (data logging) the time button is pressed.. so i thought to use at89c2051 for this purpose i have made the ckt prototype....but still some problems are there, i have to design a driver ckt to on the alarm.and i dont know how to do data logging on pc...by rs485... this is the circuit i designed but it didnt run according to program....so modify my prog for other micro controller trainer i have....the program runs fine ....now the modifications i want in my hardware is seven segment display of timer and it wud be better if timer can be set by user inputs through switches... can u guide me what modifications i must do in my circuit..plz help i want to make this thing like professional. ORG 00H MOV SP,#60 MOV TMOD,#21H ;TIMER 1 MODE 2, TIMER 0 MODE 1 MOV TH1,#-3 ;9600 BAUD RATE MOV SCON,#50H ; SERIAL MODE SPECIFIER PROGR: MOV P1,#00H MOV P3,#00H ACALL DELAY ;--------------------------------------- CANB: MOV TMOD,#01H SETB P1.7 ;BUZZER INDICATOR OFF SETB P1.4 ;ATTENDANCE INDICATOR OFF SETB P1.1 ;SYSTEM BUSY INDICATOR OFF CLR P1.3 ;RELAY OFF SETB P1.0 ;BUZZER ON ACALL DELAY CLR P1.0 ;BUZER OFF ;---------------------------------------- REPEAT: CLR P1.1 ;SYSYTEM BUSY ON ACALL DELAY30M SETB P1.1 ;SYSTEM BUSY LED OFF SETB P1.0 ;BUZZER ON SETB P1.3 ;RELAY ON CLR P1.7 ;BUZZER INDIACTOR ON SETB P1.2 ;MAKE P1.2 INPUT PORT SWITCH: JNB P1.2,SWITCH CLR P1.0 ; BUZZER OFF CLR P1.3 ; RELAY OF SETB P1.7; BUZZER INDICATOR OFF ;----------------------------------------------- SERIAL: SETB TR1 MOV DPTR,#MYDATA SER_1: CLR A MOVC A,@A+DPTR JZ REPEAT ACALL TRANSMIT INC DPTR SJMP SER_1 TRANSMIT: MOV SBUF,A T_1: JNB TI,T_1 CLR TI RET ;---------------------------------------- DELAY: MOV R4,#100 DL1: MOV R5,#200 DL2: MOV R6,#200 DL3: DJNZ R6,DL3 DJNZ R5,DL2 DJNZ R4,DL1 RET ;---------------------------------------- DELAY30M: MAIN: MOV R1,#9 MAIN1: MOV R2,#200 MAIN2: ACALL TIMER DJNZ R2,MAIN2 DJNZ R1,MAIN1 RET TIMER: BACK: MOV TH0,#4BH ; FOR 50MS MOV TL0,#0FDH SETB TR0 TIM: JNB TF0,TIM CLR TR0 CLR TF0 RET MTDATA : DB 'MACHINE ATTENDED',0 ;---------------------------------------- END