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Figure 23-5 X10 header cable. (Rear) phone jack and wire
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WEBLINK MONITORING SYSTEM
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CONTENTS AT A GLANCE Basic Components
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Weblink Monitoring System Board Parts List Web-Server Module Assembly Parts List
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magine remotely monitoring up to 12 channels of information and displaying it anywhere in the world, via the Internet with the Weblink multichannel monitoring system; see Fig. 24-1. The Weblink system consists of a BASIC STAMP 2 microprocessor and a mini webserver module. The Weblink system allows enormous flexibility in creating a remote monitoring system. The Weblink monitoring system can monitor normally open and normally closed alarm switches for perimeter detection and/or monitor a wide range of sensors such as light, humidity, temperature, pH, and magnetic sensors. Once activated, the alarm system will notify you via the Internet anywhere in the world.
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322 WEBLINK MONITORING SYSTEM
Figure 24-1 Weblink monitoring system.
The Weblink monitoring system provides a dedicated web page, incorporated in the onboard mini web-server module (WSM), which can be used to remotely display the 12 alarm conditions on any web browser. The multichannel Weblink monitoring system can also send an e-mail message or a file to a remote computer, informing you of an alarm condition.
Basic Components
The Weblink monitoring system is centered around the BASIC STAMP 2 controller section, shown in Fig. 24-2, and a mini web server, shown in Fig. 24-3. The project revolves around the lower-cost BASIC STAMP 2 alternative (the 16C57 PIC BASIC interpreter chip, a 28-pin DIP style STAMP 2), rather than the stock BASIC STAMP 2 module. The lower-cost 28-pin PIC BASIC interpreter chip requires a few external support chips and occupies a bit more real estate, but the cost is significantly less. The 28-pin BASIC STAMP 2 alternative requires a few external support components, a 24LC6B memory chip, a MAX232 serial interface chip, and a ceramic resonator. The MAX232 requires four 1- F capacitors, a diode, and a resistor and provides a conventional serial I/O, which is used to program the Weblink microprocessor. The alternative STAMP 2 was chosen instead of a non-BASIC PIC chip, since this is a work in progress and features can be added at any time in the future. The Weblink system provides 12 normally open/closed inputs which can be used for sensor detection. The system has four output pins, a status
BASIC COMPONENTS 323
5V U2
3 2 1 5 6
24LC16B
1 27
Programming cable 6 DSR 7 5 4 3 RTS GND DTR TX RX
5V R9 R10 R11 R12 JP2
1 2 3
Siren TX RX
RESET MAX232
J4 5 R17 P15
25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 2 28
BASIC STAMP 2
P11 P10 P9 P8 P7 P6 P5 P4 P3 P2 P1 R8 P0 5V JP1
1 2 3
D2 P12
8 9 8
9 11 14 7 16 2 6 1 3 4 5 15
5 C3 C2
D1 C4 C5
9-pin DB-9 female
0.1 F
5V 9V 5V
D3 R16
U4 I 7805 C6 0.2
12 IN 10 F
Figure 24-2 Weblink controller.
indicator, an output for alarm siren, annunciator, strobe lamps, etc. and two additional pins for serial communication to an always-on PC which can act as a server, if you elect to send e-mail notification to a remote computer, cell phone, or alphanumeric pager. Figure 24-3 illustrates the mini web-server module (WSM), which plugs into the main Weblink monitoring board. The mini web-server module is a real web server in a 1-insquare package. The module itself consists of two main chips a microprocessor for control and an Ethernet protocol server and a crystal. Additional support components consist of two exclusive-OR gates and a pulse transformer/filter with an integrated RJ-45 jack, a few capacitors and resistors, and a link indicator LED. This powerful little web-server module is a true web server that will hold a custom 48-kbyte web page. The Weblink monitor web page consists of a 12-channel status chart of alarm stations with green/red indicator lights. Anyone going to the web page address of the Weblink mini-server module
6 7 8 2
10 Base-T filter
Figure 24-3 Server module.
RJ-45
R1 C1 PCTX Pin 24 5V R3
1 2 3 4
18 17 16
5 6 7 8 9
WSM Web Server Module
15 14 13 12 11 10
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