Proceed from the reality, design a kind of domestic, connect with telephone line, the easy to operate, work stable and reliable intellectual burglar alarm device of remote. When people go out, often hope to implement automatic supervision and call the police in order to make the family’s property avoid suffering a loss. To demand this, develop a series of alerting automatic telling status, such as door magnetic touch-type and infrared rays monitors alerting automatic telling status,etc.. The intellectual burglar alarm device of remote that this text will introduce, can monitor a plurality of a bit more important such as door, window at the same time ,Find, steal the intersection of feeling and call number in time, can pay alerting signal call out with Ordinary Telephone Line, its characteristic is stable and reliable, practicability, suitability are strong, and have higher flexibility.
Basic operating principle
As shown in Fig. 1, the intellectual burglar alarm device of remote is by the detection circuit of the signal, reset circuit, incoming circuit of the telephone number, 89C51 one-chip computer, speech circuit, Simulated Off-Hook hang electromechanical No., DTMF code transmitting line, ringing current signal detection circuit and busy tone signal detection circuit etc. to form.
What DTMF code transmitting line is sent is and is is presetted well by the incoming circuit of the telephone number and stores the telephone number in CPU by users, this number can be set up at will, it can be that urban program-controlled telephones are such as unit telephone number or 110 , mobile phone or BP when.
When the detection circuit of the signal measures someone to intrude upon, namely send out the triggering signal as the alarm signal, through enlarging sending CPU. CPU time delay 10s, if the host enters, can utilize reset circuit to enable CPU initialisation in this 10s, otherwise plan to call the police. CPU output situation of the ringing current signal detection circuit of procuratorial work at first, if export as a high level, prove the intersection of subscriber device and ringing, can’t offhooking dial, need, go on, delay time, punish, only when exporting as the low level, CPU instructs simulation to pluck the offhooking of electromechanical way, sends DTMF telephone number, call out the telephone receive side preserved. Two kinds of situations appear at this moment: Square engaged-line and telephone receive side ringing of telephone receive. If appear first situation, system go on offhooking dials and then imitate on hook, delay time; If side’s ringing, offhooking of telephone receive, namely begin to send the Signal Tone or speech signal recorded and produced in APR9600, on hook finally.
Circuit composition and operating principle
Detection circuit of one signal
The sensor is human infrared sensors of P2288 passive form pyroelectric in Fig. 2. It adopts the equilibrium to examine difference way and work, only responds to moving the infrared radial line of human body of 7- 14 m wavelength, will not be influenced by ambient temperature and visible light, the sensor can respond to the human body within 10m and radiate the infrared rays while installing the fresnel lens additionally. Move the radiative infrared rays of human body detect by the sensor, the sensor will produce the faint electric signal, through filtering, enlarging, give the comparator two-wayly. In order to defend the faulty action, the signal will be compared with threshold level, the image output of the pulse will emerge, regard high level as the alerting signal, send into CPU.
2 telephone number incoming circuit
DTMF Coder is CSC5087 in Fig. 3, it can produce a series of dual-tone signals according to different key sets, CCITT International Telegraph and Telephone Consultative Committee Have stipulated the combination with high, low frequency group of key set. For example, push ” 8 ” The key, it is fL to send out DTMF signal frequency =852Hz, fH =1336Hz.
DTMF SC8870 in Decoder, it translate first 4 outputs of binary code into every DTMF signal, 16 DTMF signals correspond to separately amounting to 16 binary codes by 0000- 1111. For example, fL sent to CSC5087 =852Hz, fH =DTMF signal of 1336Hz, export ” 1000 ” after SC8870 decipher Code, correspond to the intersection of key set and ” the 8 ” .
3 speech circuits
The speech circuit is used for recording and producing and broadcasting the speech signal or other warning message that users should call the police, corresponding information can be presetted and can revise at any time by users.
Proceed from the reality, design a kind of domestic, connect with telephone line, the easy to operate, work stable and reliable intellectual burglar alarm device of remote. When people go out, often hope to implement automatic supervision and call the police in order to make the family’s property avoid suffering a loss. To demand this, develop a series of alerting automatic telling status, such as door magnetic touch-type and infrared rays monitors alerting automatic telling status,etc.. The intellectual burglar alarm device of remote that this text will introduce, can monitor a plurality of a bit more important such as door, window at the same time ,Find, steal the intersection of feeling and call number in time, can pay alerting signal call out with Ordinary Telephone Line, its characteristic is stable and reliable, practicability, suitability are strong, and have higher flexibility.
Basic operating principle
As
capacitance bridge shown in Fig. 1, the intellectual burglar alarm device of remote is by the detection circuit of the signal, reset circuit, incoming circuit of the telephone number, 89C51 one-chip computer, speech circuit, Simulated Off-Hook hang electromechanical No., DTMF code transmitting line, ringing current signal detection circuit and busy tone signal detection circuit etc. to form.
What DTMF code transmitting line is sent is and is is presetted well by the incoming circuit of the telephone number and stores the telephone number in CPU by users, this number can be set up at will, it can be that urban program-controlled telephones are such as unit telephone number or 110 , mobile phone or BP when.
When the detection circuit of the signal measures someone to intrude upon, namely send out the triggering signal as the alarm signal, through enlarging sending CPU. CPU time delay 10s, if the host enters, can utilize reset circuit to enable CPU initialisation in this 10s, otherwise plan to call the police. CPU output situation of the ringing current signal detection circuit of procuratorial work at first, if export as a high level, prove the intersection of subscriber device and ringing, can’t offhooking dial, need, go on, delay time, punish, only when exporting as the low level, CPU instructs simulation to pluck the offhooking of electromechanical way, sends DTMF telephone number, call out the telephone receive side preserved. Two kinds of situations appear at this moment: Square engaged-line and telephone receive side ringing of telephone receive. If appear first situation, system go on offhooking dials and then imitate on hook, delay time; If side’s ringing, offhooking of telephone receive, namely begin to send the Signal Tone or speech signal recorded and produced in APR9600, on hook finally.
Circuit composition and operating principle
Detection circuit of one signal
The sensor is human infrared sensors of P2288 passive form pyroelectric in Fig. 2. It adopts the equilibrium to examine difference way and work, only responds to moving the infrared radial line of human body of 7- 14 m wavelength, will not be influenced by ambient temperature and visible light, the sensor can respond to the human body within 10m and radiate the infrared rays while installing the fresnel lens additionally. Move the radiative infrared rays of human body detect by the sensor, the sensor will produce the faint electric signal, through filtering, enlarging, give the comparator two-wayly. In order to defend the faulty action, the signal will be compared with threshold level, the image output of the pulse will emerge, regard high level as the alerting signal, send into CPU.
2 telephone number incoming circuit
DTMF Coder is CSC5087 in Fig. 3, it can produce a series of dual-tone signals according to different key sets, CCITT CCITT committee knows Have stipulated the combination with high, low frequency group of key set. For example, push ” 8 ” The key, it is fL to send out DTMF signal frequency =852Hz, fH =1336Hz.
DTMF SC8870 in Decoder, it translate first 4 outputs of binary code into every DTMF signal, 16 DTMF signals correspond to separately amounting to 16 binary codes by 0000- 1111. For example, fL sent to CSC5087 =852Hz, fH =DTMF signal of 1336Hz, export ” 1000 ” after SC8870 decipher Code, correspond to the intersection of key set and ” the 8 ” .
3 speech circuits
The speech circuit is used for recording and producing and broadcasting the speech signal or other warning message that users should call the police, corresponding information can be presetted and can revise at any time by users.
The speech circuit in this system chooses the recording and playbacking chip APR9600 of the pronunciation, chip this adopt simulation store technical one fine tone quality and noise low afraiding of deenergization, very repeated new speech circuiting of recording and playbacking, monolithic circuit recording/replacing 32- 60s. APR9600 has many kinds of manual control modes, the circuit is simple at the time of multistage control, it is adjustable to sample speed and telediphone time, each single bond begins, stops and circulates many kinds of functions.
4 ringing current signal detection circuit
The ringing current signal detection circuit is used for finding whether there are 25Hz/90V ringing current signals on the telephone circuit. As shown in Fig. 4, polarity protective circuit is made up of circuit such as commutating, filtering and voltage regulation. The high level signal outputted of the ringing current signal after this circuit is not a regular square wave, still need the shaping circuit formed by G1, G2 two-step Schmitt’s inverter. At this moment, the high level exported is sent into CPU, delay time to deal with, waits for the blackout of ringing current.
5 busy tone signal detection circuit
As noted previously, dial DTMF behind the telephone number, telephone receive if side is answer a call, it is 0.7s to send back to the busy tone signal cycle on the line, 450Hz voice signal whose duty ratio is 50% ,CPU sends out on hook of simulation and time-delay command according to this signal.
As shown in Fig. 5, the busy signal is measured and formed by phase locked loop of protective circuit of polarity and NE567. NE567 If you can’t examine, shake frequency as 450Hz,it is confirm whether 450Hz voice signal at circuit not to used for. Because busy tone signal serial voice signal, NE567 ‘ Output either for serial low level,but level alternate, oscillating
vtl machine beacon with frequency of 1.429Hz. NE567 It is discern to used for finishing by busy signal, if you can’t examine, shake by frequency as 1.429Hz,if before phase lockings first class is 1.429Hz just in signal frequency in outputs cyclical, export it as a low level, the indicator signal existing as the busy signal, send into CPU, finish relevant movements.
Bibliographical reference
Gold very much of a minister. Pyroelectric employ ‘ Have . Electronic world, 1995
Gold very much of 2 ministers. Pyroelectric employ ‘ Leave . Electronic world, 1995
3 circle Hunan is high. Recording and playbacking chip APR9600 of the pronunciation. Electronic world, 1999
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