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Figure 21-3 Data-Alert main board.
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C5 J5 RX J5-3 J5-2 J5-1 J5-4 TX D1 R1 ATN GND C4 C3
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16 15 14 13 12 11 10 9
1 2 3 4 5 6 7 8 9 10 11 12 13 14
28 27 26 25 24 23 22 21 20 19 18 17 16 15
J4-3 J4-2 C8 J4-1 C9 R15
R4 R5 R6 R7 R8 9
R9 R10 R11
D2 D3 T1
Phone
jack J6
J3-1 J3
9V in C1
5 C2 J2 J1
BASIC COMPONENTS 277
phone line at J6, and also acts to hold the phone line. The other secondary transformer lead is coupled to the phone line via C11. C11 is blocking capacitor that keeps the phone off 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 the 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 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 Data-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 Data-Alert circuit. The 9-V source is also used to provide power to optional enhancement modules. The Data-Alert can also drive a siren or flash outdoor lights to create a local noise alarm if desired. The diagram in Fig. 21-4 illustrates optional local alarm connections. Relay 1 can be used to drive small loads such as an electronic Sonalert, or with the addition of Relay 2 you can be drive larger loads, such as motor sirens or flashing outdoor lamps. You can drive two external loads from OT-1 and OT-2. Output OT-3 is left for future expansion.
9V Sonalert 9V Relay 1 IN4001 N/O N/C 110Vac Relay 2 N/O N/C 110V relay
OT1 OT3 2N2222 AUX OUT 1K
Siren
Figure 21-4 High-power relay driver.
278 DATA-ALERT
Construction of the Data-Alert Board
Construction of the main Data-Alert board is quite straightforward. The Data-Alert prototype is built on a dual-sided glass-epoxy circuit board. Be sure the circuit board is facing you with the component side 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 are 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 cutout or notch taken at the top of the chip or a small circle cutout 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 Data-Alert circuit board measures 4 by 21 2 in and can be housed in a suitable plastic enclosure. Note that the basic Data-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. Table 21-1 illustrates the Data-Alert main board pinout diagram.
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