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CONTENTS AT A GLANCE Motion Module
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CONSTRUCTION OF THE MOTION MODULE ASSEMBLING THE UNIT MOTION MODULE PARTS LIST
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BUILDING THE TVL MODULE TESTING THE TVL BOARD TEMPERATURE/VOLTAGE LEVEL MODULE PARTS LIST
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NORMALLY OPEN/CLOSED INPUT LOOP SENSOR BOARD ALARM SENSOR MODULE PARTS LIST
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BASIC COMPONENTS CONSTRUCTING THE MODULE ASSEMBLING TO THE TELE-ALERT BOARD LISTEN-IN MODULE PARTS LIST
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The pyroelectric motion module is a great addition to the Tele-Alert or Page-Alert microprocessor alarm controller. The pyroelectric motion module centers around a pyroelectric, or body heat, infrared sensor and a controller chip, and it can be used to activate either the Tele-Alert or the Page-Alert alarm controller; it is shown in Fig. 22-1. The motion module can sense body heat from 10 to 50 ft away.
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294 INPUT SENSOR MODULES
Figure 22-1 Motion module.
The pyroelectric infrared (PIR) controller chip block diagram is depicted in Fig. 22-2. The PIR controller is a complex chip that provides amplification, filtering, clock, comparators, a daylight detector, and a voltage regulator. Table 22-1 lists the pinouts of the 20pin PIR controller chip. The motion module circuit is illustrated in the system diagram in Fig. 22-3. The circuit begins with the sensitive PIR detector at U1. The pyroelectric infrared detector is a sensitive three-lead high-impedance sensor, which is shown with a 47-k output resistor at R1. A sensitivity or range control for the PIR sensor is shown at R2. The PIR sensor is coupled to a specially designed PIR controller chip that is optimized for PIR alarm sensors. The motion module is powered from a 5-V source and can tap power from either the Tele-Alert or Page-Alert main controller boards. Once the PIR sensor picks up on the scent of a human, it determines if the signal is valid by using timing, comparators, and filters. If a valid signal is processed, it is output to pin 16 and is used to drive transistor Q1. Transistor Q1 is utilized to drive the input pin on the Tele-Alert or Page-Alert system boards. Capacitors C5, C6, and C7 are offset filters, antialiasing filters, and a dc capacitor respectively. Resistors R3 and R4 are utilized as a frequency reference between pin 20 and Vcc. The PIR sensor is placed across pins 2, 7, and 8 of the controller chip. The actual alarm output pin of the controller is located at pin 16, which is coupled to the output driver transistor at Q1. The R/C time constant for the output on time of the controller is between pins 18 and 19, and is controlled by R5, R6, and C8. A movement indicator LED is located between pin 17 and pins 9 and 10, the analog and digital ground pins. The chip employs
MOTION MODULE 295
VCC U2 Sensitivity adj Offset filter PYRO (D) PYRO (S) Gain select Anti alias dc cap PIR front-end amplifiers and noise cancellation circuits Switched capacitor bandpass filter
FREF R C
Oscillator and synchronization circuitry
Threshold comparators and timing circuitry
Daylight sense Daylight adjust
Daylight detector amplifier and comparator
Voltage regulator
VREG
GND Figure 22-2 PIR controller chip.
a daylight detector, which is not implemented in our application. Power to the controller chip is brought to pin 1 of U1 via a 78l05 regulator on either the Tele-Alert or Page-Alert boards.
CONSTRUCTION OF THE MOTION MODULE
Construction of the PIR motion module is quite straightforward and can be completed in less than 1 hour. The motion module is fabricated on a 13 4- by 21 2-in circuit board. The PIR sensor is at the bottom, opposite the solder pad outputs. An IC socket is used for U1 to facilitate removal or exchange in the event of a malfunction of the controller chip. When constructing the motion module, be sure to observe the polarity of the capacitors, transistor, regulator, and the PIR sensor and the placement of U1 in its socket. The components, especially the controller chip and PIR sensor, can be damaged if they are placed incorrectly. Note that the PIR sensor is placed on the foil side of the circuit board. Pay particular attention to the layout diagram when installing the components. The LED indicator is located between the controller chip and the 10-pin header. Observe that pin 1 of the controller is located near the regulator at U1. At one edge of the PC board, you will find the 10-pin solder tabs used to secure the 10-pin male header pins, which couple the motion module to the Tele/Page-Alert. The top pin, 1, is reserved for the 9-V power input power
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