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J1-1 5 Figure 19-3 Tele-Alert schematic. 9
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U1 BASIC STAMP 2
28 27 26 25 24 23 22 21 20 19 18 17 16 15
XTL J4 OT3 OT2 C8 OT1 C9 R15 D2 C10 D3 T1 R16 R17 Phone D4
C5 J5 RX J5-1 J5-2 J5-3 J5-4 TX D1 R1 ATN GND C4 C3
C11 J2
R4 R5 R6 R7 R8
R9 R10 R11
J3 9 IN I U5 O
J1-10
CONSTRUCTING TELE-ALERT 255
hook until an alarm condition occurs. The solid-state relay at U4 acts to short out C11 when an event or alarm condition occurs, thus coupling T1 to the phone line. Resistor R16 is a metal oxide varistor (MOV) and is used to protect the circuit from high voltage spikes. Pins 22 and 23 may be utilized as auxiliary outputs to drive local alarm sirens or outdoor lamps if desired, while pin 24 is left for further expansion. Pin 25 of U1 is used as a status indicator. The 20-MHz ceramic resonator is connected between pins 26 and 27 to establish the clock reference for the BASIC interpreter chip at U1. Pin 28 is utilized to reset the microprocessor, via S1, if the system locks up. The serial 16-kbyte EEPROM memory is coupled to the microprocessor via pins 6 and 7. The microprocessor communicates via U3, a MAX232 serial communication chip. The MAX232 is coupled to the microprocessor through pins 8 and 9, very simply an input and an output pin. Four capacitors are all that are required to animate the MAX232 serial communication chip. These capacitors are required as a charge pump to create a minus voltage for the serial chip. The MAX232 is coupled to 9-pin serial connector for serial communication with a laptop or personal computer for programming purposes. The Tele-Alert circuit is powered via the regulator at U5, which provides 5 V to U1, U2, and U3. A 9-Vdc wall wart, or wall cube, power supply is used to provide power to the Tele-Alert circuit. The 9-V source is also used to provide power to optional enhancement modules.
Constructing Tele-Alert
Construction of the Tele-Alert is quite straightforward. The Tele-Alert prototype is constructed on a dual-sided glass-epoxy circuit board. Be sure the circuit board has the component side facing up toward you, as you begin placing parts into the circuit board. This is a very important step, so take your time and make sure you are placing the components on the correct side of the circuit board, before you begin soldering parts to the double-sided circuit board. You can begin by placing the resistors and capacitors on the board. Be sure to observe the correct polarity when installing the capacitors or the circuit will not work correctly. Integrated circuit sockets were installed for the ICs in the event the circuit needs to be serviced at some point in time. These sockets can now be installed. Next, you can install the diodes and the LED. Once again, be sure to observe the correct polarity of the diodes when installing. Now install the ceramic resonator and the MOV, followed by the transformer and regulator U5. Please note the orientation of the semiconductors before installing them. The integrated circuits usually have either a small circular cutout or a notch at the top of the chip. Generally, pin 1 is just to the left of the circle or cutout. Next, you can install the male communication header J5, and the two optional enhancement female headers, J1 and J2. Last, install the reset switch. The Tele-Alert circuit board measures 4 by 21 2 in and can be housed in a suitable plastic enclosure. Note, the basic Tele-Alert is only about 1 2 in high, but if you intend to add optional modules at a later time, you should consider an enclosure that has more height to accommodate the optional circuit boards.
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