AT89C2051 Wireless anti-theft alarm, Wireless Burglar alarm
Keywords: AT89C2051 design wireless anti-theft alarm
This site introduces the host's production in the wireless anti-theft alarm system, which uses the AT89C2051 single-chip as a central processing chip, making the system's functional expansion, and for the entire system, if you want to change some setting, just change the corresponding software. There is a great help to learn a single chip. I. Hardware design circuit schematic is shown in the figure below, mainly consisting of wireless reception, data decoding, data processing, alarm circuit, output display, power off alarm, and power circuit. The whole machine receives frequency 315m, data decoding is used in the market to use more PT2272 dedicated decoding chips, reliability and stability; the task of data processing is completed by the microcontroller, for distinguishing alarm signal, and accepts various operational instructions. Complete the corresponding operation, when the alarm signal is received, the alarm circuit is transmitted, and the loud police car alarm is issued. On the other hand, the specific address information is output, determined that the alarm signal is sent; the power-off alarm function is real-time to monitor the power Status Second, the software design of the alarm is simple, interested netizens can develop according to their own actual needs, here to list the basic procedures, for reference.
ORG 0000h;
CLR P1.6; CLR P1.2; Acall Dys; setb p1.6acall ys; setb p1.2; CLR P1.3; CLR P1.6; ACALL DYS; setb p1.6; acall ys; setb p1.3; CLR P1.4; CLR P1.6; Acall Dys; Setb P1.6; Acall Ys; Setb P1.4; CLR P1.5; CLR P1.6; Acall Dys; Setb P1.6; ACALL YS; MOV P1 , # 0ffh; MOV P3, # 0ffh; agarn: MOV R6, # 34h; JB P3.6, Tindian; check whether the power outage JNB P3.0, agarn; Is there a valid wireless signal input ACALL DYS; JNB P3.0, Agarn ; MOV A, P3; Read the wireless signal value ANL A, # 3CH; 0011, 1100CJNE A, # 20H, XH; 20H = 00 (10, 00) 00 b; dismantled procedure CLR P3.1; CLR P1.6; Withdrawal success response CLR P1.4; indicator CLR P1.5; SETB P3.7; ACALL YS; setb p1.6; AJMP AGARN;
XH: CJNE A, # 30h, one; judgment is the armed signal setb P3.1; CLR P1.6; the armed anti-Success response setb p1.4; indicator setb p1.5; setb p3.7; acall ys; setb p1 , 6; AJMP AGARN; ONE: JNB P3.1, AGARN; CJNE A, # 4H, TWO; 1H = 00 (00, 01) 00bmov P1, # 0fbh; Ajmp Bj; TWO: CJNE A, # 8H, Three; 2H = 00 (00, 10) 00bmov p1, # 0f7h; ajmp bj; Three: Cjne A, # 0CH, FOUR; 3H = 00 (00, 11) 00bmov P1, # 0efh; AJMP BJ; FOUR: CJNE A, # # 10H, FIVE; 00 (01,00) 00bmov P1, # 0dfh; AJMP BJ; FIVE: NOP; NOP; NOP; AJMP AGARN; BJ: CLR P3.7; Start alarm signal ACALL YS; Delay 34 second JB P3. 0, AGARN; DJNZ R6, BJ; SETB P3.7; Close alarm signal AJMP AGARN; TINDIAN: MOV P1, # 0ffH; power outage CLR P1.6; CLR P1.5; ACALL YS; setb p1.6; setb p1 .5; ACALL YS; CLR P1.6; CLR P1.5; Acall ys; setb p1.6; setb p1.5; acall ys; ajmp agarn; dys: MOV R0, # 14h; l1: Mov R1, # 0f1h L2: NOP; NOP; NOP; DJNZ R1, L2; DJNZ R0, L1; RTYS: MOV R1, 0FFH; L3: MOV R1, 0F1H; L4: NOP; NOP; NOP; DJNZ R1, L4; DJNZ R0, L3 Ret; end; this wireless alarm host is 315m for any emission frequency, and the wireless probe encoding the PT2262 can be applied, such as wireless human detector, wireless door magnetic sensor, wireless microwave detector, etc., due to the actual environment The settings of the desired host and the matching are also different. Netizens can achieve different functions according to their own glow, so that different functions are written, which is no longer detailed here. Read more
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