ASSEMBLING TO THE TELE-ALERT BOARD in Software

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ASSEMBLING TO THE TELE-ALERT BOARD
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You are now ready to attach the listen-in board to the main Tele-Alert board. Take a look at the Tele-Alert board; at one edge you will notice the input terminal connections at the outside edge of the board, followed by two rows of header sockets. The first row of female 10-pin header sockets at the outside edge is used to hold the listen-in board, while the second set of inside header pins is used to power the TVL board and the motion module board. The TVL or motion module daughter boards can be utilized at the same time as the listen-in board if desired. Grasp the Tele-Alert board in one hand and plug in the listenin module. Now you are now ready to utilize the listen-in board with your Tele-Alert. Connect a 9-V wall wart power supply, phone line, and alarm switch or sensor contacts to the Tele-Alert
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LISTEN-IN MODULE PINOUTS DESCRIPTION
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9V GND Enable Audio 5V
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306 INPUT SENSOR MODULES
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main board and you are ready to go! The listen-in board can be used in conjunction with motion module to detect movement and then let you listen in to room sounds once motion is detected, so your Tele-Alert can be used as a complete self-contained alarm system.
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R1 R2, R7 R3, R5 R4 R6 C1 C2 C3, C4 U1 MIC Miscellaneous 2.2-k 10-k 100-k 5.6-k 5-M
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DATA-TERM UNIT
CONTENTS AT A GLANCE Circuit Description Building the Data-Term Unit Operating the Unit Data-Term Parts List
he Data-Term unit is a versatile companion to the Data-Alert System. The Data-Term unit, when called by the Data-Alert system, will provide remote control of home appliances or remote alarm data display. The Data-Term is placed across your phone line at home or away and waits for a call from the Data-Term unit. The Data-Term picks up the phone when called and can be used to display remote data information. The Data-Term is shown in Fig. 23-1. The heart of the Data-Term is the PIC 16C57 BASIC STAMP 2 alternative microcontroller. The complete Data-Term circuit is shown in Fig. 23-2. The PIC 16C57 chip emulates the BASIC STAMP 2 computer. The PIC 16C57 is preloaded with a BASIC interpreter much like the Parallax BASIC STAMP 2 (BS2). The PIC 16C57, however, is a much less expensive approach to solving a problem, but requires a few more external parts than the BASIC STAMP 2. The PIC 16C57 requires very little in the way of support chips to make it function only two support chips, a 24LC16B EEPROM for storages, and a MAX232 for communication. Only a few extra components are needed to form a functional microprocessor with serial input/outputs. A 20-MHz ceramic resonator and a few resistors and a diode are all that are needed to use the processor in its most simple form.
Copyright 2003 by The McGraw-Hill Companies, Inc. Click Here for Terms of Use. 307
308 DATA-TERM UNIT
Figure 23-1 Data term unit.
The 28-pin PIC 16C57 is a very capable and versatile little microprocessor that can perform many tasks.
Circuit Description
The circuit begins with the telephone input at L1 And L2. A metal oxide varistor (MOV) at R1 is used to protect the circuit from phone line spikes. Ahead of the audio coupling transformer T1 are two control circuits, which are optically coupled to the microprocessor. The optocoupler at U3 is used to sense phone line ringing voltage, and it sends a 5-V signal to the STAMP 2 to awaken the BS2 controller to a phone call. Optocoupler U2 is used to answer, or pick up the phone, upon ringing. The STAMP 2 senses ringing voltage, and then uses the optorelay at U2 to answer the phone. Capacitor C3 and resistor R2 are used coupled to the transformer T1, but the phone line signals are essentially blocked from reaching the transformer by C3. When the phone rings and the microprocessor senses the ringing, the program is instructed to apply a 5-V signal to U2, which is used to answer the phone by shorting out capacitor C3. This effectively couples the phone line to the DataTerm circuit. The incoming phone data signals are clipped and filtered by D3, D4, and C5. The opamp at U4 is used to amplify the incoming audio signal from the phone. The op-amp U4 also performs coupling duty between T1 and the modem at U5. Next the audio signals are directed at the MXCOM MX604 data modem. The modem chip is a full FSK modem with transmit and receive capabilities just like the controller of a conventional modem. The
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