Transcript Group Presentation Guidelines -

David Hinely
Dept. of Applied Engineering & Technology
Eastern Kentucky University
[email protected]
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Locking mechanism for a door
Uses the least amount of power possible
Uses RFID to unlock the door
Stays in its state when power is removed
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Wanted to lock door
electrically without large
power draw
Often, power is wasted
on a strong
electromagnet to keep
doors locked shut when
using RFID tags
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Utilized an Arduino in
some way
This would be the first
time I would be using
an Arduino
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Find a way to remotely unlock a door
utilizing an Arduino
Use as little power as you can
Spend less than $100 on parts
Door must stay in same position when
powered off
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The materials can be attached to a standard
door
There is no way to access the parts from the
outside
The door can both be locked and unlocked
with electronics
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void granted (int setDelay) {
if(doorState == 0){
Serial.println(F("UNLOCKING Door"));
digitalWrite(relay, HIGH); // Unlock door!
digitalWrite(relayC, HIGH); // Power Door Lock
doorState = 1;
} else {
Serial.println(F("LOCKING Door"));
digitalWrite(relay, LOW); // Lock door!
digitalWrite(relayC, HIGH); // Power Door Lock
doorState = 0;
}
delay(setDelay);
// Power door lock for 300ms
}
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Prototype 1
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Implemented RFID
control
Used electromagnet and
NdFeB magnetic rod to
lock door
Failed due to
electromagnet only
pulling despite current
flow
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Prototype 2
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Implemented transistor
circuits and lower
power use
Used electromagnetic
solenoids to lock door
Failed due to
components not being
strong enough
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Prototype 3
Implemented motor
use to lock/unlock
door
 Used second
physical relay
rather than solid
state due to ‘bug’
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MagneLock
Source: https://youtu.be/bZRQKOz4K3U
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The locking system can be built for
approximately $80, and allows for
redundant paths for access
Better understanding of magnetism and
how shape affects magnetic pull
Sometimes its better to improve upon
something already created rather than try
to do it yourself
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Implications of work
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Can be used with a Smart House
Can be bypassed in multiple different ways
Possible extensions to project
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Replace RFID with NFC for use with phone
Attach sensor to detect position of latch
Replace current relays with lower voltage,
smaller form factor relays
Place RFID sensor inside deadbolt frame
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Baysal, O. S. (2014, August 17). Arduino RC522 RFID Door
Unlock. Retrieved April 27, 2016, from
http://www.instructables.com/id/Arduino-RC522RFID-Door-Unlock/
Baysal, O. S. (2015, July 2). omersiar/RFID522-Door-Unlock:
Arduino RC522 RFID Access Control. Retrieved from
https://github.com/omersiar/RFID522-Door-Unlock
Choquette, L. (2009, December 11). Electromagnet Atraction
vs Repel mode test 1 [Video file]. Retrieved from
https://www.youtube.com/watch?v=wAYsAN5QPnA
Cribbs Technologies. (2009, October 16). Control a Schlage
electronic deadbolt with an arduino! Retrieved from
http://www.instructables.com/id/Control-a-Schlageelectronic-deadbolt-with-an-ardu/
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Fitzgerald, S., & Shiloh, M. (2013). Arduino Projects Book
(2nd ed.). Torino, Italy: Arduino LLC.
Kozak, R. (2013, September 14). Arduino RFID Tutorial
[Video file]. Retrieved from
https://www.youtube.com/watch?v=jgKAyX0h2M8
Pan, A. (2015). Electromagnetic Mjolnir (From Thor's
Hammer Prank). Retrieved from
http://www.instructables.com/id/ElectromagneticMjolnir-From-Thors-Hammer-Prank/
Pan, A. (2015, November 6). Mjolnir How-To [Video file].
Retrieved from
https://www.youtube.com/watch?v=WVzlHa5CQnA
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Currey, M. (2016, January 28). [Arduino Nano]. Retrieved from
http://www.martyncurrey.com/wp-content/uploads/2014/10/HC-05-Basic-set-up-584x455.jpg
New York University. (2014). [DC Motor]. Retrieved from
https://itp.nyu.edu/archive/physcomp-spring2014/uploads/dcmotor_bb2.png
RadioShack. [MOFSET IRF640N]. Retrieved from
https://cdn.shopify.com/s/files/1/0953/5270/products/02762020_00_a5da0381-0926-464086e9-f61eb46f8fa3.jpeg?v=1446835795
Tadros, S. (2015, October 4). [RFID card]. Retrieved from
http://lightningtalks.me/content/images/2015/09/wiring.png
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Thanks to Omer Baysal for publishing the RFID code under
public license
And special thanks to Chandra, Richardson, and Kilgore for
taking the time to teach us all
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