This project uses an Arduino microcontroller and an RDM630 RFID receiver to control access to my garage. This is very handy when I need to get in with a handful of groceries. I carry an RFID card in my wallet that works just like the key chain FOB. Several spare FOBs have been given to family members who need access to the garage from time to time. I built a similar unit that cycles the deadbolt on a door leading from the garage into my house. When an authorized person wants to enter the garage they just wave their FOB or card across the antenna coil once which cycles a relay on and off one time. The relay is connected to the garage door manual operation button and behaves just like pushing the button one time. If the door is closed it opens, if the door is open it closes and if the door is in motion it stops. I added the 'SCAN HERE' label after I made the movie. It just looked too plain.

Step 1: Cards And FOBs

There at least two form factors that can work with this project. Both work equally well. The card is great for guys since it can be carried in a wallet, then the entire wallet is waved across the antenna coil. No need to remove the card. There have been no problems with the RFID antenna coil sensor damaging the mag-stripes on other cards I carry.

The coil inside the key ring FOB is wound so perfectly. The TV show "How It's Made" has a piece about making headphones coils that shows how their coils are made. There is also another piece about making speakers that shows coil winding as well. How It's Made is my favorite TV show. Ever.

<p>Wow. This is just what I am looking for as I already have an RDM630! Thank you soo much!</p>
Couldn't someone just unscrew it and short the wires?
<p>bronze Medal</p><p><a href="https://www.instructables.com/member/jeepdude48507/" rel="nofollow">jeepdude48507</a> (author) 0 seconds ago<a href="https://www.instructables.com/id/Arduino-Garage-Door-Opener/CZT0R0BHXD60N1Z" rel="nofollow">Reply</a><br></p><p>No. That's the beauty of this design. Only antenna wires go outside. An RF (radio) signal of 125Khz must be present along with a long string of the correct ones and zeroes. For whatever it's worth, a magnet will have no effect on this circuit either. There are diodes on the back of the receiver to prevent too much voltage from developing across the antenna and destroying it. All of the 'works' are contained safely on the secure side.</p><p>Thank you for your question.</p>
I can't seem to find your RFID backdoor ible. am very interested in it because I believe it may solve a problem for my parents home. Thanks.
granted I am searching from the mobile app and not on a PC.
nevermind, found it searching your handle. And then also searching 'RFID operated deadbolt'. Thank for the great instructibles.
<p>I didn't have to use a transistor to drive the LED, the Arduino could have easily driven the LED directly. Most LEDs only draw around 20mA or so and it would be no problem to drive one directly from the output pin. The ATMEGA328 specification shows a maximum drive current of 40mA per output pin with 200mA total for the chip. I have plans to drive more LEDs and / or relays form these outputs so I chose to add buffer transistors at design time. 2N3904 transistors are cheap and add a little 'smoke' insurance. I have just uploaded a clearer schematic and in it you can see a piezoelectric beeper is being driven directly from the Arduino output pin 11. That was a good point to bring up. Thank you for your input. These little chips are as tough as they are smart!</p>
Wy do you use a transistor to switch the led?

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