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R1 R2 R3, R4, R5, R6 R7 R8 R9, R10 C1 C2 C3, C4 D1 D2 U1 U2 M1 S1 J1 J2 P2 J3 J4 2405-k 10k3304.7k1001 4-W
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1- F 35-V electrolytic capacitor 10- F 35-V electrolytic capacitor 0.1- F 35-V disk capacitor LED Sidactor P3002AB-ND LM7805 regulator (5 V) BS2 microcontroller (original) CH1817-D DAA module Momentary pushbutton switch RJ11 PC-mount telephone jack 4-pin programming header male 4-pin programming header female 10-pin female header 10-position screw terminal
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CONTENTS AT A GLANCE Basic Components Construction of the Data-Alert Board Modem Module Board Real-Time Clock Chip Modem Module Operation Setting Up the Data-Alert Uses for Data-Alert Data-Alert (Main Board) Parts List Modem Board (Daughter Board) Parts List
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he Data-Alert is a unique, low-cost, multichannel microprocessor-controlled remote event/alarm reporting system. It will immediately send an alarm notification or X10 commands via telephone to its Data-Term alarm display unit or a computer with a standard dial-up modem. The main Data-Alert board is shown in Fig. 21-1, and the modem board is depicted in Fig. 21-2. The Data-Alert can monitor up to four different alarm or event conditions from a host of different types of sensors and report the particular channel that was activated. The Data-Alert can be configured to monitor voltage levels, temperature changes, movement, contact closures, windows, doors, safes, and perimeters as well as computer equipment. The Data-Alert can be utilized to protect your home, office, shop, or vacation home.
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Copyright 2003 by The McGraw-Hill Companies, Inc. Click Here for Terms of Use. 273
274 DATA-ALERT
The Data-Alert is used with your existing telephone line; therefore, no additional charges are added to your monthly phone bill. The Data-Alert is programmed to call you on your Data-Term display unit and display and/or perform commands. The Data-Alert can be expanded to monitor up to eight different input event or alarm conditions. The optional motion module will allow the Data-Alert to detect moving persons in a protected space, while the optional temperature/voltage level module allows your DataAlert to monitor up to four temperature or voltage level presets, and report the changes to your Data-Term.
Basic Components
The Data-Alert multichannel alarm reporting system begins with the main circuit diagram shown in Fig. 21-3. The heart of the Data-Alert is the PIC 16C57 chip, which 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. The PIC 16C57 basically requires only two support chips, a 24LC16B EEPROM for storage and a MAX232 for communication. Only a few extra components are needed to form a functional microprocessor with serial input/output. A 20-MHz ceramic resonator, a
Figure 21-1 Data-Alert main board.
BASIC COMPONENTS 275
Figure 21-2 Modem board.
few resistors, and a diode are all that are needed to use the processor in its most simple form. The 28-pin PIC 16C57 is a very capable and versatile little microprocessor that can perform many tasks. In order to turn the BS2 look-alike into a Data-Alert project, a few more parts must be added to the basic configuration. First, you need to configure pins 10 through 17 as inputs, for a total of eight inputs, that can be used to sense events or alarm conditions. The first four input pins are brought out to the terminal block for easy access. These first four inputs, IN1 through IN4, are used as inputs to the microprocessor. The second four input pins are IN5 through IN8; note the resistors placed across each of the input pins. Pins 18 through 25 are configured as output pins. Pin 19 is used to drive the solid-state relay at U4. The microprocessor activates the LED in U4, which in turn closes the relay contacts at pins 4 and 6 of the relay, essentially shorting out blocking capacitor C11 and allowing the phone to go on hook and begin dialing your cell phone or pager. Pins 20 and 21 of U1 are audio output pins. Pin 20 of U1 outputs the touch-tone signals needed to dial the phone when an alarm condition is sensed, while pin 21 is used to output the tone sequences that are used to indicate via your cell phone which event/alarm channel has been activated. The capacitors at C9 and C10 are used to couple the touch-tones and the alarm sequence tones to the coupling transformer network formed by T1 and the associated components. Capacitor C10 is placed across T1, while zener diodes D2 and D3 are used as voltage clamps diodes at the input of the transformer. Transformer T1 is used to couple the audio from the Data-Alert to the phone line, once the unit has been triggered. Resistor R9 is used to couple one side of the transformer to the
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