burglar alarm using parallel port?
Shariq M asked:
i need to create a burglar alarm using parallel port with software interfacing using Turbo C codes imported into Java (JNI)
i need to create a burglar alarm using parallel port with software interfacing using Turbo C codes imported into Java (JNI)
the problem is that i cant figure out how to do the hardware part!
can anyone suggest me any online resource for that?
i have to either use the keypad security system model or use a sensor attached to the door that goes on whenever the door is opened. I also need to know which pins of parport to connect the hardware to and what signal should i tell the program to look for..
please help fast!
well.. ok then make it usb port.. but HOW?
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August 15th, 2009 at 6:39 pm
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Wouldn’t it be simpler with USB.
You can much easily find components for usb and it is easier to program.
August 18th, 2009 at 2:21 am
security system sensor
You can use a parallel port easily. For the keypad part, use an Intel 8279 – it’s a keyboard controller. (It’s old technology – circa 1978 – but it’s still the easiest way to interface a keypad.)
For the sensor, hang a 1k resistor on the 5 volt line and connect the sensor between the other end of the resistor and ground. Connect the junction of the sensor and the resistor to a pin on a parallel port. (I’d use an isolation resistor and a buffer chip to keep transients from blowing the port.) Then you watch for a transition on that port pin – whether it goes from 0 to 1 or 1 to 0 depends on whether the sensor is open or closed when the door is closed. They come either way.