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19.04.2014
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This circuit can be built from readily available low-cost components, some of which may even be hiding in your junkbox! This sensor is first initialized into your security systems console so that it can be recognized. It has a sensitivity selector switch so the sensor can be set to trip the alarm if any movement is detected (most sensitive) or if two movements or continuous movement is detected (less sensitive). The indicated value of 22 ? for resistor R1 causes an average current of about 65 mA through infrared emitter D1. RF transmission range allows it to be placed up to 100 feet from the security system console.


A random code is automatically generated during set-up, which uniquely identifies each sensor.
If a sensor does not report in this could mean a weak or dead battery or that it has been tampered with. Neither the service provider nor the domain owner maintain any relationship with the advertisers.
Because the IRED is pulsed at a duty factor of about 50% through the action of T1 and IC1, a peak current of 128 mA flows during every half cycle. The security console logs-in each of these random codes as the next zone in sequence (up to 16 zones). The security console will not arm if the motion sensor hasn't reported in, but this can be overridden by pressing the console's BYPASS button. I've found the best way to get around false alarms from a pet is to put some white vinyl tape across the bottom of the "eye" to raise its field of "vision" above the height of your dog or cat. In case of trademark issues please contact the domain owner directly (contact information can be found in whois).


When motion is detected, the sensor sends an RF signal back to the security console setting off the alarm.
You will need to tinker with this to get the right amount of coverage to match your area being protected and your pet. Because of the presence of T3, capacitor C5 is allowed to charge only when no signal is being received.
The operating point of the receiver input circuit is rather dependent on ambient day-light levels and the value of R4 may need to be adjusted a little to ensure a voltage of between 1.5 V and 4 V on the collector of T1 when no signal is being received. Some dc buzzers cause a lot of back-emf so it may be necessary to insert a diode in series with the output of IC1.



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