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' subroutine read_timeout ' variable "timeout" is assigned the ' number of 10 second periods to wait. ' (10 seconds is the smallest practical ' duration between shutter presses.) read_timeout: flMinutes VAR WORD ' Read i/o pins specifying timeout and units
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Listing 18-1 Radio-controlled digital camera interface program (Continued).
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250 R/C KITE/GLIDER DIGITAL CAMERA SYSTEM
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timeout = INS & TIMEOUT_MASK flMinutes = INS & SEC10_OR_MIN ' Treat zero timeout as max if timeout <> 0 then timeout_apply_mult timeout = 65535 goto timeout_end timeout_apply_mult: ' If minute units specified apply ' to convert to 10sec units. if flMinutes = 0 then timeout_end timeout = timeout * 6 timeout_end: return ' Subroutine FLASH_ERROR flash_error: flash_pin = RED_LED_PIN flash_num = 1 flash_len = 500 gosub flash return ' Subroutine FLASH_ROGER flash_roger: flash_pin = GREEN_LED_PIN flash_num = 3 flash_len = 100 gosub flash return multiplier
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Listing 18-1 Radio-controlled digital camera interface program (Continued ).
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TELE-ALERT
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CONTENTS AT A GLANCE Basic Components Constructing Tele-Alert Operating Tele-Alert Alarm Configurations Tele-Alert Parts List
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he Tele-Alert is a unique new low-cost, multichannel, microprocessor-controlled remote event/alarm reporting system that will immediately notify you via your cellular phone (Fig. 19-1).The Tele-Alert can monitor up to four different alarm or event conditions from a host of different types of sensors, as shown in Fig. 19-2, and report the particular channel that was activated. The Tele-Alert can be configured to monitor voltage levels, temperature changes, movement, contact closures, windows, doors, safes, and perimeters as well as computer equipment. The Tele-Alert can be utilized to protect your home, office, shop, or vacation home. The Tele-Alert is used with your existing telephone line; therefore, no charges are added to your monthly phone bill. The Tele-Alert can be programmed to call you on your cellular phone, or to call a friend, neighbor, co-worker, or a relative if desired. The Tele-Alert is expandable for future applications. The Tele-Alert is compact and easy to use as well as expandable. Simply plug in a 9-V power supply, connect up your telephone line and the input connections, and you are ready
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Copyright 2003 by The McGraw-Hill Companies, Inc. Click Here for Terms of Use. 251
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252 TELE-ALERT
Figure 19-1 Tele-Alert.
Telephone line Tele-Alert
Programming PC
Power
IN 1
IN 2
IN 3
IN 4
Siren
Figure 19-2 Tele-Alert system.
BASIC COMPONENTS 253
to go. The optional motion module allows the Tele-Alert to detect moving persons and will trigger the Tele-Alert; in addition the motion module contains two normally open and two normally closed alarm loop channels, so a number of alarm sensors/switches can also be used. The optional temperature/voltage level module allows your Tele-Alert to monitor up to four temperature or voltage level presets, and report the changes via your cellular phone or pager. The optional listen-in module will allow you to listen in to the area being protected for up to 2 minutes, if desired. The optional enhancement modules can turn your Tele-Alert into a complete alarm system to protect your home, cottage, or office (see Chap. 22, Input Sensor Modules ).
Basic Components
The Tele-Alert multichannel alarm reporting system begins with the circuit diagram shown in Fig. 19-3. The heart of the Tele-Alert is the PIC 16C57 chip, which emulates the BASIC STAMP 2 computer. The PIC 16C57 is preloaded with a BASIC interpreter much like the Parallax BASIC STAMP 2 (BS2). The PIC 16C57, however, is a much less expensive approach to solving a problem, but requires a few more external parts than the BASIC STAMP 2. The PIC 16C57 requires very little in the way of support chips to make it function only two, a 24LC16B EEPROM for storage and a MAX232 for communication. Only a few extra components are needed to form a functional microprocessor with serial input/output. A 20-MHz ceramic resonator, a few resistors, and a diode are all that are needed to use the processor in its most simple form. The 28-pin PIC 16C57 is a very capable and versatile little microprocessor that can perform many tasks. In order to turn the BS2 alternative into a Tele-Alert project, a few more parts must be added to the basic configuration. First, you need to configure pins 10 through 17 as inputs, for a total of 8 inputs that can be used to sense events or alarm conditions. The first four input pins are brought out to the terminal block for easy access. The second four input pins are shown at IN5 through IN8. Note the resistors placed across each of the input pins; these inputs are reserved for future use. Pins 18 through 25 are configured as output pins. Pin 18 is used to activate or enable the microphone in the listen-in module, if utilized. Pin 19 is used to drive the solid-state relay at U4. The microprocessor activates the LED in U4, which in turn closes the relay contacts at pins 4 and 6 of the relay; this essentially shorts out blocking capacitor C11 and allows the phone to go on hook and begin dialing your cell phone. Pins 20 and 21 of U1 are audio output pins. Pin 20 of U1 outputs the touch-tone signals needed to dial the phone when an alarm condition is sensed, while Pin 21 is used to output the tone sequences that indicate via your cell phone which event/alarm channel has been activated. The capacitors at C9 and C10 are used to couple the touch-tones and the alarm sequence tones to the coupling transformer network formed by T1 and the associated components. Capacitor C10 is placed across T1 while zener diodes D2 and D3 are used as voltage clamps at the input of the transformer. Transformer T1 is used to couple the audio from the Tele-Alert to the phone line, once the unit has been triggered. Resistor R9 is used to couple one side of the transformer to the 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 a blocking capacitor that keeps the phone off
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