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The STAMP 2 alarm controller and transmitter were mounted on a small PC board measuring 4 by 4 in. It is advisable to use an integrated circuit socket for the STAMP 2 controller, in the event of a failure. Be careful to correctly orient the STAMP 2 when installing in the IC socket. When assembling the transmitter/controller, be sure to observe the correct polarity of the capacitors, diodes, and LEDs. A 4-pin 0.010-in male header at P1 is soldered to the PC board. A mating 4-pin 0.010-in female header at J1 is cabled to a 9-pin DB-9 female RS-232 connector, for programming the STAMP 2 processor. If you elect to use the
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Figure 6-3 AM data transmitter.
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86 MULTICHANNEL RADIO ALARM SYSTEM
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RX/TX Circuit board ground
Figure 6-4 Quarter-wave vertical antenna.
input conditioner circuit, or more than one conditioner circuit, you will need to wire these to inputs to the main controller board. You will then need to select an enclosure that will house the STAMP 2 controller, the transmitter, and all the input conditioner circuits. An aluminum chassis box is recommended, in order to reduce interference to the transmitter circuit from outside noise sources. A two-circuit coaxial power jack can be mounted on the rear of the chassis box. A screw terminal bank was used to accept input sensor connections. An antenna jack was mounted on the rear of the chassis in order to connect to the external antenna. The transmitter ground and controller ground are connected together to form a common ground and are tied to the metal chassis box enclosing the alarm controller assembly. A quarter-wave vertical whip or a half-wave dipole could be used for the antenna. A 9V wall wart power supply is used to power the 5-V regulator; also note the controller could be powered from a rechargeable battery for fail-safe and/or portable operation. The receiver display unit is fabricated on a 3- by 5-in printed circuit board, with the receiver, display, buzzer, and regulator. A metal chassis box is used to house the receiver/display unit, to reduce the possible interference from outside noise sources. The most difficult part of the fabrication is mounting the display in the chassis box: The chassis box is marked up and the outline hole is outlined. A small drill bit is used to drill out holes along the perimeter of the display outline. Then a file is used to custom-fit the display into the enclosure. A wall wart power supply can be used to power the receiver/display unit or a 9- to 12-V rechargeable battery can be used for portable operation if desired. A small hole is drilled on the top of the case to allow the piezo buzzer to soundoff through the case. The buzzer is epoxied to the underside of the enclosure. A coaxial power jack is mounted on the rear of the receiver chassis, along with an antenna jack to accept an external antenna. A quarter-wave vertical whip or half-wave dipole can be used for the antenna on the receiver display unit. Be sure to use the same type and polarity of antennas between the transmitter and receiver units to ensure maximum range. For example, if the transmitter utilizes a vertical antenna, the receiver section should also use a vertical antenna. If you elect to use a half-wave dipole for the transmitter, then a half-wave dipole should be used at the receiver unit as well.
CONSTRUCTION 87
1/ -wave 2
dipole antenna
RX/TX Circuit ground Figure 6-5 Half-wave dipole antenna.
Component side
13 15
Pin # 1 2 3 4 5 6 7
Pin name RF VCC RF GND Data in N/C N/C N/C RF GND
Pin # 8, 9 10 11 12 13 14 15
Pin name N/C AF VCC AF GND AF VCC Test Data out AF VCC
Figure 6-6 Abacom AMHRR3 data receiver.
Once the multichannel alarm system has been constructed, you will need to download the software into the STAMP 2 controller board. Connect your personal computer and the STAMP 2 via the programming cable you constructed. Now locate the STAMP 2 Windows editor titled STAMPW.EXE on the CD-ROM. Next apply power to the STAMP 2 controller transmitter board. Finally, locate and download the RADALARM.BS2 program (Listing 6-1) into the BASIC STAMP 2 controller. Your multichannel alarm system is now completed and ready to test. Turn on both the alarm controller transmitter and the alarm controller receiver. Now you will need to simulate an alarm condition to test the transmitter and receiver combination. Connect one of the input channels on the controller to 5 V to simulate an alarm condition. Once an alarm condition has been triggered, it should propagate through the system. The receiver
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