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would be able to view the status of the Weblink multichannel alarm from anywhere in the world. The diagram in Fig. 24-4 depicts a clever method of providing both normally open and normally closed input sensors or alarm switches. Any number of normally closed or normally open switches can be used in this input circuit. Two 1N914 diodes, an npn transistor, and a 10-k resistor are all that are required for the input device. You could elect to build one of these input circuits for each of the BASIC STAMP s input pins P0 through P11 if you desire. The output of this input converter circuit provides a 5-V signal to the input of the STAMP 2 upon an alarm signal. A daughter input board could be designed to plug into the header pins at J2 at the bottom of the main Weblink PC board.
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The sensor threshold/comparator circuit, shown in Fig. 24-5, can be used to monitor a wide array of input sensor devices. The threshold/comparator circuit consists of a dual LM393 comparator chip; only a single op-amp is shown. Two threshold comparator circuits can be constructed using this one chip and few support components. The negative input of the comparator chip at pin 2 is used as the feedback path as well as the threshold adjustment point based on a 50-k potentiometer control. The threshold control can be biased with either 5 or 9 V A 9-V reference source, on the main board, provides a wider-range input. . A sensor device is connected to the positive input of the comparator at pin 3. Almost any resistive-type sensor could be utilized in this circuit. A temperature sensor, a resistive light sensor, a humidity sensor, a pH sensor, or a Hall effect switch could be used at S1. You could also elect to use the input at In1 to monitor a 5-V signal source and control the threshold for voltage change detection at this input. The output of the threshold detection circuit is a 5-V output, which could be connected to any number of BASIC STAMP 2 inputs. For example, you could monitor four temperature sensors, light sensors, and voltage sources all at the same time with the multichannel Weblink system. A comparator daughter board could be fabricated and plugged into the header pins at J2.
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The diagram in Fig. 24-6 highlights how to connect various output devices to the multichannel Weblink system. As mentioned, the alarm monitoring system provides an output
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N/O R1 S4 R2 S1 S2 S3 S5 S6 S7
N/O R3 C1
D1 Q1 D2 R4 Output STAMP I/O pins
loop
Figure 24-4 Alarm loop circuit.
326 WEBLINK MONITORING SYSTEM
9V R5 R1 R4 R2
R7 C1 5V R8
9V S1
393A
Out STAMP I/O pins
C2 In1 R6 Figure 24-5 Threshold/comparator circuit.
for external alarm devices. The output at pin 23 (P13) from the controller is connected through a 1-k resistor to the base of the 2N3904 relay driver transistor. Relay RL1 is a 5-V driver relay that can be used to turn on Sonalert or other small sounders or lamps. You can also use relay 1 to drive a second, higher-current relay, which can be used to drive a large motor siren or strobe lamp, etc. The smaller 5-V relay at RL1 is used to drive the larger-current 110-V relay RL2. So, for low current loads, only one relay is needed, while higher current loads must have two relays.
Construction of the System
The Weblink monitoring system is fabricated on a 3- by 5-in double-sided circuit board, which houses the STAMP 2 microprocessor, optional Weblink server, and the glue, or support, components. A 5-V regulator at U4 powers the STAMP 2, the mini web server, and associated support components. The 9-V zener is the reference source for the sensor comparator module, if one is utilized. Construction of the Weblink PC board is quite straightforward. First, install all the IC sockets. Next you can install the resistors; be sure to observe the color codes on the resistors in order to correctly identify and install them in their proper locations. Next install the capacitors; be sure to observe the polarity marking on the capacitors. Locate the diodes and the indicator LED. Be careful to identify the zener versus signal diodes and observe the correct polarity. Install the voltage regulator; once again be sure to observe the input versus output pins when installing this component on the board. Finally, install the header pins for the web-server module, the input pins, and power as well as programming connector J3 and server connection J4. Last, you will need to install the input programming jumpers JP1 and JP2, which tie the STAMP 2 input pins either high or low. The software provided (Listing 24-1) is configured for inputs to be tied low or to ground and go high upon activation.
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