【導讀】一定量水由電爐加熱,要求水溫可以在一定范圍內由人工設頂,并能在環(huán)境溫度降低時自動實現(xiàn)調整,以保持設定的溫度基本不變。：溫度設定為40℃—90℃最小區(qū)分度為1℃；：溫度控制的靜態(tài)誤差名1℃；因此，以單片機為核心組成一個專用計算機應用系統(tǒng)，以滿足檢測、控制應用類型的功能要求。AD590為電流型傳感器溫度每變化1℃其電流變化1uA在35℃和95℃。此部分電路主要由光電耦合器MOC3041和雙向可控硅BTA12組成。MOC3041光電耦合器的耐壓值為400v，它的輸出級由過零觸發(fā)的雙向可控硅構成，它控制著主電路雙向可控硅的導通和關閉。。此部分是電路的核心部分，系統(tǒng)的控制采用了單片機89C52。單片機89C52內部有8KB單元的程序存儲器及256字節(jié)的數(shù)據(jù)存儲器。因此系統(tǒng)不必擴展外部程序存儲器和數(shù)據(jù)存儲器這樣大大的減少了系統(tǒng)硬件部分。

　　

【正文】 H,12 MOV A,7DH JMP LOOPPPQ 12: CJNE A,59H,13 MOV A,23H JMP LOOPPPQ 13: CJNE A,5AH,14 MOV A,29H JMP LOOPPPQ 14: CJNE A,65H,15 MOV A,4DH JMP LOOPPPQ 15: CJNE A,66H,16 MOV A,89H JMP LOOPPPQ 16: CJNE A,69H,17 MOV A,81H JMP LOOPPPQ 17: CJNE A,6AH,18 MOV A,1DH JMP LOOPPPQ 18: CJNE A,95H,19 MOV A,01H JMP LOOPPPQ 19: MOV A,09HLOOPPPQ: RET 定時中斷TIMER0: ORL TL0,LOW(6553650000) MOV TH0,HIGH(6553650000) PUSH ACC PUSH PSW MOV 2CH,R6 MOV R6,2BH DJNZ R6,HOMEBACK MOV R6,2CH MOV R6,10 MOV 2DH,R0 MOV R0,COUNT CJNE @R0,1,XX0 MOV 34H,A MOV A,GUAN1 XCH A,30H MOV GUAN1,A MOV A,34H JMP HOMEBACKXX0: MOV 34H,A MOV A,GUAN1 CJNE A,0FFH,XXX0 MOV GUAN1,30H MOV A,34HXXX0: CJNE @R0,2,XX1 MOV 34H,A MOV A,GUAN2 XCH A,31H MOV GUAN2,A MOV A,34H JMP HOMEBACKXX1: MOV 34H,A MOV A,GUAN1 CJNE A,0FFH,XXX1 MOV GUAN1,31H MOV A,34HXXX1: CJNE @R0,3,XX2 MOV 34H,A MOV A,GUAN3 XCH A,32H MOV GUAN3,A MOV A,34H JMP HOMEBACKXX2: MOV 34H,A MOV A,GUAN1 CJNE A,0FFH,XXX2 MOV GUAN1,33H MOV A,34HXXX2: CLR TR0HOMEBACK:MOV 2BH,R6 MOV R6,2CH MOV R0,2DH POP PSW POP ACC RETI 延時 DELAY: MOV R2,10H D1: MOV R3,20H DJNZ R3,$ DJNZ R2,D1 RETDELAY1: MOV R4,70H D2: MOV R5,70H DJNZ R5,$ DJNZ R4,D2 RET 碼表 TABLE: DB 11H 7DH 23H 29H DB 4DH 89H 81H 1DH 01H 09H DB 0FEH END2 控制部分 FLAG BIT FLAG0 BIT FLAG1 BIT FLAG2 BIT GUAN1 EQU 20H GUAN2 EQU 21H GUAN3 EQU 22H GUAN5 EQU 23H GUAN6 EQU 24H GUAN7 EQU 25H GUAN001 EQU 29H GUAN002 EQU 2BH GUAN003 EQU 2CH TEMP EQU 28H TEMP1 EQU 27H ORG 00H JMP START ORG 0BH JMP TIMER0 ORG 23H JMP SINT ORG 100HSTART : MOV SP,50H MOV TMOD,00100001B MOV IE,10010010B MOV IP,00010000B MOV SCON,01010000B ANL PCON,01111111B MOV TH0,0E8H MOV TH1,0E8H MOV GUAN1,0 MOV GUAN2,0 MOV GUAN3,0 MOV GUAN5,0 MOV GUAN6,0 MOV GUAN7,0 MOV TEMP,0 MOV R6,20 MOV R1,2 SETB TR1 MOV TL0,LOW(6553630000) MOV TH0,HIGH(6553630000) MOV 40H,3 MOV R7,8 CLR FLAG CLR FLAG0 CLR FLAG1 CLR FLAG2 JMP $SINT : PUSH ACC PUSH PSW JBC TI,OUT CLR RI MOV A,SBUF JB FLAG,RECEIVE CJNE A,0AAH,OUT MOV 3AH,3BH SETB FLAG JMP OUTRECEIVE : MOV 3EH,R0 MOV R0,3AH MOV A,SBUF MOV @R0,A INC 3AH MOV R0,3EH MOV 3FH,R4 MOV R4,40H DJNZ R4,OUT1 MOV 40H,3 MOV GUAN1,3BH MOV GUAN2,3CH MOV GUAN3,3DH NOP NOP CLR FLAG1 CLR FLAG2 CLR FLAG0 MOV A,GUAN1 SWAP A ORL A,GUAN2 NOP MOV TEMP,A MOV TEMP1,TEMP SETB TR0 CLR FLAGOUT1: MOV 40H,R4 MOV R4,3FHOUT: POP PSW POP ACC RETITIMER0: ORL TL0,LOW(6553630000) MOV TH0,HIGH(6553630000) PUSH ACC PUSH PSW CLR TR0 DJNZ R7,HOME0 JMP HOME1HOME0: JMP HOMEHOME1: MOV R7,8 溫度采集 CLR CALL DELAY SETB NOP NOP CLR MOV P0,0FFH MOV A,P0 SETB CALL TRANSFORM CALL EMIT CLR C MOV A,GUAN001 檢測溫度高低 SWAP A ORL A,GUAN002 MOV 47H,A JNB FLAG0,CHULI JMP CHULI0 CHULI: CALL SELFPROCESSCHULI0: CLR C MOV A,47H SUBB A,TEMP JNC CLOSE SETB FLAG0 JNB FLAG2,NYT JNB