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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 ).

EXHIBIT 8-19

The simplest, and oldest, form of modulation is on-off keying. Early telegraph systems used direct currents that were keyed on and off, and were sent along wires. The first radio transmitters employed spark-generated hash signals that were keyed using the telegraph code. The noise from the sparks, like ignition noise from a car, could be heard in crystal-set receivers several miles away. At the time of their invention, this phenomenon was deemed miraculous: a wireless telegraph! Keying is usually accomplished at the oscillator of a continuous-wave (CW) radio transmitter. A block diagram of a simple CW transmitter is shown in Fig. 26-1. This is the basis for a mode of communications that is, and always has been, popular among radio amateurs and experimenters.

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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.

While the use of Morse code might seem old-fashioned, even archaic, a CW transmitter is extremely simple to build. A human operator, listening to Morse code and writing down the characters as they are sent, is one of the most efficient data receivers ever devised. Until computers are built to have intuition, there ll always be a place for Morse code radio communications. Besides being efficient, as any CW fanatic radio ham will tell you, it s just plain fun to send and receive signals in Morse code. Morse code is a form of digital communications. It can be broken down into bits, each having a length of one dot. A dash is three bits long. The space between dots and dashes, within a single character, is one bit. The space between characters in a word is three bits. The space between words is seven bits. Punctuation marks are sent as characters attached to their respective words. An amplitude-versus-time rendition of the Morse word eat is shown in Fig. 26-2. Morse code is a rather slow way to send and receive data. Human operators typically use speeds ranging from about 5 words per minute (wpm) to 40 or 50 wpm.

Morse code keying is the most primitive form of amplitude modulation (AM). The strength, or amplitude, of the signal is varied between two extreme conditions: full-on and full-off. There is another way to achieve two-state keying that works better with

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.

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