Do you know how infrared motion detector alarm? Whenever someone comes in the infra-red zone. Infrared motion sensor, which detects moving human body. The alarm will sound automatically.The detection zone coverage is 80 degrees horizontally to 8 meters vertically and 20 degrees 30 second delay allows you to get out of the way before the alarm bells or system will activated.20 degree vertical coverage allows you to the position alarm so pets will not be on the path alarm. A siren will sound for few minute, then turn off automatically and reset itself.
Ultrasonic Alarm [Home Alarms Systems]
This alarm equipment transmits a ultrasonic and receives the ultrasonic which is reflected at the obstacle and gives the alarm in the case which set within the distance. The distance which can be set is from about 40 cm to 10 m.It can detect only the object to be in the movement while emitting infrared rays and reflects the ultrasonic.
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4 Digit Keypad Controlled Switch [Home Alarms Systems]
This is a universal version of the Four-Digit home alarm system Keypad . The circuit is modified to free up the relay contacts. This allows the circuit to operate as a general-purpose switch. It also means that it can be used to control all type of alarm circuits
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House Alarms-Simple Door Alarm
This is a simple - easy to build - alarm circuit. For power – it used a small 9-volt battery. The standby current is virtually zero - so the battery life is good.If a switch is fitted to a door - every time the door opens the Buzzer will give a short beep. How long the output lasts depends on the delay.
If you replace the Buzzer with a relay - and use the relay to switch a Siren - you have a Simple Intruder Alarm that you can fit almost anywhere.
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