Door knob alarm with remote control / Mohd. Saffaun Ibrahim and Ahmad Ubaidillah Sheikh Salleh

Our project consists of three-block circuit. A transmitter of an infrared block circuit, a receiver of an infrared block circuit, and an alarm block circuit. Each one of it has it owns power supply The infrared transmitter uses 9V battery, and the receiver uses 12V from the adapter, where else the alann circuit uses 9V battery.
The control unit was originally designed to turn on and off a device and both of us decided to make it as an alarm with the remote control of the infrared device. We took 2 project design and combine it to be one, making it much more fun and useful. First, the infrared device is activated hence switching the alann to turn on. The switching process took place at the relay at the receiver of the infrared project
This project is then placed at the doorknob, waiting for the burglar to trigger it on Whenever a person touches the doorknob, the siren will sound immediately. There will be no electric shock when a person touches the doorknob because the alarm system uses the touch sensor to make it run. The setting of trimmer pot must be calibrated first to set the sensitivity of this doorknob alann. The more sensitive the trimmer pot, a blow of a wind will activate the siren.
This project is market oriented because it is simple, economical and useful in all kind of situations. The complete ones should cost you about RM60.00