RFID Human Motion Alarm System. Chris Hirsch & David Huskey. Automated identification method Lightweight, portable Tags can be read from several meters away, (sometimes) beyond line of site of reader Passive RFID tags have no internal power supply
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Chris Hirsch & David Huskey
Tags can be read from several meters away, (sometimes) beyond line of site of reader
Passive RFID tags have no internal power supply
Small electrical current induced in the antenna by the incoming RF signal provides just enough power for the tag to power up and transmit a response back.Introductionto RFID
Controls all outputs of the system (Siren, LEDs, and PC display) by setting voltages on output pins.PIC16F877A Microcontroller
Microcontroller uses the ADC function to monitor the AC voltage.
Converts a continuous signal to a discreet digital number from 0 to 1024 (2^10)
When voltage rises above 50mV or 10 on the ADC scale on this input (and the alarm is in active mode) the alarm is triggered.Microcontroller: Motion Detector Input
Green LED is on when the controller considers no tags to be in the room.
When both LEDs are on, unauthorized personnel are to stay out of the room, because the alarm is in active mode.Microcontroller: LED Output
Longer Beeping for a 10 second grace period when the PIC decides that there is an intruder.
Continuous noise from the siren if the alarm is not deactivated after the grace period.Microcontroller: Siren Output
Microsoft HyperTerminal displays the text.
Shows when the alarm is activated and deactivated.
Shows which ID tags enter and exit the protected room.Microcontroller: Computer Output
Alarm sounds when the system is in active mode and an unauthorized intruder is in the 40’ x 40’ room.
Information about current ID tags in the room and the state of the alarm system can be transmitted serially to a PC for observation.
The design is user friendly. Users are able to quickly identify the beeps and LEDs to know if their ID tag has been scanned.Successes
Extra buttons on keypad could be utilized to add more functionality such as the ability for the user to change the key-code.
More RFID tags could be added.Design Alternatives